The Role of Hormones in Controlling Vascular Differentiation

  • Roni AloniEmail author
Part of the Plant Cell Monographs book series (CELLMONO, volume 20)


The vascular system in plants is induced and controlled by streams of inductive hormonal signals. Auxin produced in young leaves is the primary controlling hormone in vascular differentiation. Its downward transport pathways, major controlling mechanisms, and sensitivity of cells to auxin are clarified. Cytokinin, from the root cap moves upward, increases the sensitivity to auxin and stimulates cambial cell divisions. Gibberellin produced in mature leaves moves non-polarly and promotes elongation, regulates cambium activity, and induces long fibers and long tracheids. Transgenic plants with elevated bioactive gibberellin concentrations grow rapidly and yield numerous longer fibers and longer tracheids. Centrifugal movement of ethylene from maturing vessels induces the radial vascular rays. In conifer trees, jasmonate, which promotes defense response, is mediated by ethylene and induces traumatic resin ducts. In addition the role of the hormonal signals in regulating gradients of cell size and density, in controlling the type of differentiating vascular element and how they have shaped wood evolution are elucidated.


Tracheary Element Vessel Element Cambial Activity Sieve Tube Resin Duct 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


  1. Agusti J, Herold S, Schwarz M, Sanchez P, Ljung K, Dun EA, Brewer PB, Beveridge CA, Sieberer T, Sehr EM, Greb T (2011) Strigolactone signaling is required for auxin-dependent stimulation of secondary growth in plants. Proc Natl Acad Sci USA 108:20242–20247PubMedCrossRefGoogle Scholar
  2. Akiyama K, Matsuzaki K, Hayashi H (2005) Plant sesquiterpenes induce hyphal branching in arbuscular mycorrhizal fungi. Nature 435:824–827PubMedCrossRefGoogle Scholar
  3. Aloni R (1979) Role of auxin and gibberellin in differentiation of primary phloem fibers. Plant Physiol 63:609–614PubMedCrossRefGoogle Scholar
  4. Aloni R (1980) Role of auxin and sucrose in the differentiation of sieve and tracheary elements in plant tissue cultures. Planta 150:255–263CrossRefGoogle Scholar
  5. Aloni R (1982) Role of cytokinin in differentiation of secondary xylem fibers. Plant Physiol 70:1631–1633PubMedCrossRefGoogle Scholar
  6. Aloni R (1985) Plant growth method and composition. US Patent No 4507144Google Scholar
  7. Aloni R (1987) Differentiation of vascular tissues. Annu Rev Plant Physiol 38:179–204CrossRefGoogle Scholar
  8. Aloni R (1991) Wood formation in deciduous hardwood trees. In: Raghavendra AS (ed) Physiology of trees. Wiley, New York, pp 175–197Google Scholar
  9. Aloni R (1995) The induction of vascular tissues by auxin and cytokinin. In: Davies PJ (ed) Plant hormones: physiology, biochemistry and molecular biology. Kluwer, Dordrecht, pp 531–546Google Scholar
  10. Aloni R (2001) Foliar and axial aspects of vascular differentiation – hypotheses and evidence. J Plant Growth Regul 20:22–34CrossRefGoogle Scholar
  11. Aloni R (2010) The induction of vascular tissues by auxin. In: Davies PJ (ed) Plant hormones: biosynthesis, signal transduction, action! Kluwer, Dordrecht, pp 485–506Google Scholar
  12. Aloni R, Barnett JR (1996) The development of phloem anastomoses between vascular bundles and their role in xylem regeneration after wounding in Cucurbita and Dahlia. Planta 198:595–603CrossRefGoogle Scholar
  13. Aloni R, Peterson CA (1990) The functional significance of phloem anastomoses in stems of Dahlia pinnata Cav. Planta 182:583–590CrossRefGoogle Scholar
  14. Aloni R, Peterson CA (1997) Auxin promotes dormancy callose removal from the phloem of Magnolia kobus and callose accumulation and earlywood vessel differentiation in Quercus robur. J Plant Res 110:37–44CrossRefGoogle Scholar
  15. Aloni R, Sachs T (1973) The three-dimensional structure of primary phloem systems. Planta 113:343–353CrossRefGoogle Scholar
  16. Aloni R, Ullrich CI (2007) Biology of crown gall tumors. In: Tzfira T, Citovsky V (eds) Agrobacterium. Springer, Berlin, pp 525–549Google Scholar
  17. Aloni R, Zimmermann MH (1983) The control of vessel size and density along the plant axis – a new hypothesis. Differentiation 24:203–208CrossRefGoogle Scholar
  18. Aloni R, Baum SF, Peterson CA (1990a) The role of cytokinin in sieve tube regeneration and callose production in wounded Coleus internodes. Plant Physiol 93:982–989PubMedCrossRefGoogle Scholar
  19. Aloni R, Tollier T, Monties B (1990b) The role of auxin and gibberellin in controlling lignin formation in primary phloem fibers and in xylem of Coleus blumei stems. Plant Physiol 94:1743–1747PubMedCrossRefGoogle Scholar
  20. Aloni R, Raviv A, Peterson CA (1991) The role of auxin in the removal of dormancy callose and resumption of phloem activity in Vitis vinifera. Can J Bot 69:1825–1832CrossRefGoogle Scholar
  21. Aloni R, Pradel KS, Ullrich CI (1995) The three-dimensional structure of vascular tissues in Agrobacterium tumefaciens-induced crown galls and in the host stem of Ricinus communis L. Planta 196:597–605CrossRefGoogle Scholar
  22. Aloni R, Alexander JD, Tyree MT (1997) Natural and experimentally altered hydraulic architecture of branch junctions in Acer saccharum Marsh. and Quercus velutina Lam. trees. Trees 11:255–264Google Scholar
  23. Aloni R, Wolf A, Feigenbaum P, Avni A, Klee HJ (1998) The Never ripe mutant provides evidence that tumor-induced ethylene controls the morphogenesis of Agrobacterium tumefaciens-induced crown galls on tomato stems. Plant Physiol 117:841–847PubMedCrossRefGoogle Scholar
  24. Aloni R, Feigenbaum P, Kalev N, Rozovsky S (2000) Hormonal control of vascular differentiation in plants: the physiological basis of cambium ontogeny and xylem evolution. In: Savidge RA, Barnett JR, Napier R (eds) Cell and molecular biology of wood formation. BIOS Scientific Publishers, Oxford, pp 223–236Google Scholar
  25. Aloni R, Schwalm K, Langhans M, Ullrich CI (2003) Gradual shifts in sites of free-auxin production during leaf-primordium development and their role in vascular differentiation and leaf morphogenesis in Arabidopsis. Planta 216:841–853PubMedGoogle Scholar
  26. Aloni R, Langhans M, Aloni E, Ullrich CI (2004) Role of cytokinin in the regulation of root gravitropism. Planta 220:177–182PubMedCrossRefGoogle Scholar
  27. Aloni R, Langhans M, Aloni E, Dreieicher E, Ullrich CI (2005) Root-synthesized cytokinin in Arabidopsis is distributed in the shoot by the transpiration stream. J Exp Bot 56:1535–1544PubMedCrossRefGoogle Scholar
  28. Aloni R, Aloni E, Langhans M, Ullrich CI (2006a) Role of cytokinin and auxin in shaping root architecture: regulating vascular differentiation, lateral root initiation, root apical dominance and root gravitropism. Ann Bot 97:883–893PubMedCrossRefGoogle Scholar
  29. Aloni R, Aloni E, Langhans M, Ullrich CI (2006b) Role of auxin in regulating Arabidopsis flower development. Planta 223:315–328PubMedCrossRefGoogle Scholar
  30. Anfodillo T, Deslauriers A, Menardi R, Tedoldi L, Petit G, Rossi S (2012) Widening of xylem conduits in a conifer tree depends on the longer time of cell expansion downwards along the stem. J Exp Bot 63:837–845PubMedCrossRefGoogle Scholar
  31. Bailey IW (1944) The development of vessels in angiosperms in morphological research. Am J Bot 31:421–428CrossRefGoogle Scholar
  32. Bannan MW (1958) An occurrence of perforated tracheids in Thuja occidentalis L. New Phytol 57:132–134CrossRefGoogle Scholar
  33. Barbez E, Kubeš M, Rolčík J, Béziat C, Pěnčík A, Wang B, Rosquete MR, Zhu J, Dobrev PI, Lee Y, Zažímalovà E, Petrášek J, Geisler M, Friml J, Kleine-Vehn J (2012) A novel putative auxin carrier family regulates intracellular auxin homeostasis in plants. Nature 485:119–122PubMedCrossRefGoogle Scholar
  34. Barker-Bridgers M, Ribnicky DM, Cohen JD, Jones AM (1998) Red-light regulated growth. II. Changes in the abundance of indoleacetic acid in the maize mesocotyl. Planta 204:207–211CrossRefGoogle Scholar
  35. Baucher M, El Jaziri M, Vandeputte O (2007) From primary to secondary growth: origin and development of the vascular system. J Exp Bot 58:3485–3501PubMedCrossRefGoogle Scholar
  36. Baum SF, Aloni R, Peterson CA (1991) The role of cytokinin in vessel regeneration in wounded Coleus internodes. Ann Bot 67:543–548Google Scholar
  37. Benková E, Michniewicz M, Sauer M, Teichmann T, Seifertova D, Jürgens G, Friml J (2003) Local, efflux-dependent auxin gradients as a common module for plant organ formation. Cell 115:591–602PubMedCrossRefGoogle Scholar
  38. Berleth T, Mattsson J, Hardtke CS (2000) Vascular continuity and auxin signals. Trends Plant Sci 5:387–393PubMedCrossRefGoogle Scholar
  39. Biemelt S, Tschiersch H, Sonnewald U (2004) Impact of altered gibberellin metabolism on biomass accumulation, lignin biosynthesis, and photosynthesis in transgenic tobacco plants. Plant Physiol 135:254–265PubMedCrossRefGoogle Scholar
  40. Bishopp A, Help H, El-Showk S, Weijers D, Scheres B, Friml J, Benková E, Mähönen AP, Helariutta Y (2011a) A mutually inhibitory interaction between auxin and cytokinin specifies vascular pattern in roots. Curr Biol 21:917–926PubMedCrossRefGoogle Scholar
  41. Bishopp A, Lehesranta S, Vatén A, Help H, El-Showk S, Scheres B, Helariutta K, Mähönen AP, Sakakibara H, Helariutta Y (2011b) Phloem-transported cytokinin regulates polar auxin transport and maintains vascular pattern in the root meristem. Curr Biol 21:927–932PubMedCrossRefGoogle Scholar
  42. Bollhöner B, Prestele J, Tuominen H (2012) Xylem cell death: emerging understanding of regulation and function. J Exp Bot 63:1081–1094PubMedCrossRefGoogle Scholar
  43. Booker J, Chatfield S, Leyser O (2003) Auxin acts in xylem-associated or medullary cells to mediate apical dominance. Plant Cell 15:495–507PubMedCrossRefGoogle Scholar
  44. Bradford KJ, Trewavas AJ (1994) Sensitivity thresholds and variable time scales in plant hormone action. Plant Physiol 105:1029–1036PubMedGoogle Scholar
  45. Caño-Delgado A, Lee JY, Demura T (2010) Regulatory mechanisms for specification and patterning of plant vascular tissues. Annu Rev Cell Dev Biol 26:605–637PubMedCrossRefGoogle Scholar
  46. Carlsbecker A, Helariutta Y (2005) Phloem and xylem specifications: pieces of the puzzle emerge. Curr Opin Plant Biol 8:512–517PubMedCrossRefGoogle Scholar
  47. Chaffey N, Cholewa E, Regan S, Sundberg B (2002) Secondary xylem development in Arabidopsis: a model for wood formation. Physiol Plant 114:594–600PubMedCrossRefGoogle Scholar
  48. Clouse SD (2011) Brassinosteroids. In: The Arabidopsis book, vol 9. American Society of Plant Biologists, Rockville, MD. doi: 10.1199/tab.0073,
  49. Coenen C, Lomax TL (1997) Auxin-cytokinin interactions in higher plants: old problems and new tools. Trends Plant Sci 2:351–356PubMedCrossRefGoogle Scholar
  50. Cook CE, Whichard LP, Wall ME (1972) Germination stimulants. II. The structure of strigol – a potent seed germination stimulant for witchweed (Striga lutea Lour.). J Am Chem Soc 94:6198–6199CrossRefGoogle Scholar
  51. Dayan J, Schwarzkopf M, Avni A, Aloni R (2010) Enhancing plant growth and fiber production by silencing GA 2-oxidase. Plant Biotechnol J 8:425–435PubMedCrossRefGoogle Scholar
  52. Dayan J, Voronin N, Gong F, Sun TP, Hedden P, Fromm H, Aloni R (2012) Leaf-induced gibberellin signaling is essential for internode elongation, cambial activity, and fiber differentiation in tobacco stems. Plant Cell 24:66–79PubMedCrossRefGoogle Scholar
  53. Demura T, Fukuda H (2007) Transcriptional regulation in wood formation. Trends Plant Sci 12:64–70PubMedCrossRefGoogle Scholar
  54. Deslauriers A, Giovannelli A, Rossi S, Castro G, Fragnelli G, Traversi L (2009) Intra-annual cambial activity and carbon availability in stem of poplar. Tree Physiol 29:1223–1235PubMedCrossRefGoogle Scholar
  55. Dettmer J, Elo A, Helariutta Y (2009) Hormone interactions during vascular development. Plant Mol Biol 69:347–360PubMedCrossRefGoogle Scholar
  56. Dodd IC (2003) Hormonal interactions and stomatal responses. J Plant Growth Regul 22:32–46CrossRefGoogle Scholar
  57. Domagalska MA, Leyser O (2011) Signal integration in the control of shoot branching. Nat Rev Mol Cell Biol 12:211–221PubMedCrossRefGoogle Scholar
  58. Eklöf S, Åstot C, Blackwell J, Moritz T, Olsson O, Sandberg G (1997) Auxin-cytokinin interactions in wild-type and transgenic tobacco. Plant Cell Physiol 38:225–235CrossRefGoogle Scholar
  59. Erbilgin N, Gillette NE, Mori SR, Stein JD, Owen DR, Wood DL (2007) Acetophenone as an antiattractant for the western pine beetle, Dendroctonus brevicomis LeConte (Coleoptera: Scolytidae). J Chem Ecol 33:817–823PubMedCrossRefGoogle Scholar
  60. Eriksson ME, Moritz T (2002) Daylength and special expression of gibberellin 20-oxidase isolated from hybrid aspen (Populus termulata × P. tremuloides Michx.). Planta 214:920–930PubMedCrossRefGoogle Scholar
  61. Eriksson ME, Israelsson M, Olsson O, Moritz T (2000) Increased gibberellin biosynthesis in transgenic trees promotes growth, biomass production and xylem fiber length. Nat Biotechnol 18:784–788PubMedCrossRefGoogle Scholar
  62. Evert RF (2006) Esau’s plant anatomy, meristems, cells, and tissues of the plant body – their structure, function, and development. Wiley, Hoboken, NJCrossRefGoogle Scholar
  63. Fahn A (1964) Some anatomical adaptations of desert plants. Phytomorphology 14:93–102Google Scholar
  64. Fahn A (1990) Plant anatomy, 4th edn. Pergamon Press, OxfordGoogle Scholar
  65. Fahn A, Leshem B (1963) Wood fibres with living protoplasts. New Phytol 62:91–98CrossRefGoogle Scholar
  66. Fahn A, Zamski E (1970) The influence of pressure, wind, wounding and growth substances on the rate of resin duct formation in Pinus halepensis wood. Isr J Bot 19:429–446Google Scholar
  67. Fonti P, Solomonoff N, García-González I (2007) Earlywood vessels of Castanea sativa record temperature before their formation. New Phytol 173:562–570PubMedCrossRefGoogle Scholar
  68. Friml J (2010) Subcellular trafficking of PIN auxin efflux carriers in auxin transport. Eur J Cell Biol 89:231–235PubMedCrossRefGoogle Scholar
  69. Friml J, Palme K (2002) Polar auxin transport – old questions and new concepts? Plant Mol Biol 49:273–284PubMedCrossRefGoogle Scholar
  70. Frydman VM, Wareing PF (1973) Phase change in Hedera helix L. II. The possible role of roots as a source of shoot gibberellin-like substances. J Exp Bot 24:1139–1148CrossRefGoogle Scholar
  71. Frydman VM, Wareing PF (1974) Phase change in Hedera helix L. III. The effects of gibberellins, abscisic acid and growth retardants on juvenile and adult ivy. J Exp Bot 25:420–429CrossRefGoogle Scholar
  72. Fu PL, Jiang YJ, Wang AY, Brodribb TJ, Zhang JL, Zhu SD, Cao KF (2012) Stem hydraulic traits and leaf water-stress tolerance are co-ordinated with the leaf phenology of angiosperm trees in an Asian tropical dry karst forest. Ann Bot 110(1):189–199PubMedCrossRefGoogle Scholar
  73. Fukuda H (1997) Tracheary element differentiation. Plant Cell 9:1147–1156PubMedCrossRefGoogle Scholar
  74. Fukuda H (2004) Signals that control vascular cell differentiation. Nat Rev Mol Cell Biol 5:379–391PubMedCrossRefGoogle Scholar
  75. Galiba G, Vagujfalvi A, Li CX, Soltesz A, Dubcovsky J (2009) Regulatory genes involved in the determination of frost tolerance in temperate cereals. Plant Sci 176:12–19CrossRefGoogle Scholar
  76. Gälweiler L, Guan C, Müller A, Wisman E, Mendgen K, Yephremov A, Palme K (1998) Regulation of polar auxin transport by AtPIN1 in Arabidopsis vascular tissue. Science 282:2226–2230PubMedCrossRefGoogle Scholar
  77. Geldner N, Anders N, Wolters H, Keicher J, Kornberger W, Muller P, Delbarre A, Ueda T, Nakano A, Jürgens G (2003) The Arabidopsis GNOM ARF-GEF mediates endosomal recycling, auxin transport, and auxin-dependent plant growth. Cell 112:219–230PubMedCrossRefGoogle Scholar
  78. Gerrienne P, Gensel PG, Strullu-Derrien C, Lardeux H, Steemans P, Prestianni C (2011) A simple type of wood in two early Devonian plants. Science 333:837PubMedCrossRefGoogle Scholar
  79. Gessler A, Kopriva S, Rennenberg H (2004) Regulation of nitrate uptake at the whole-tree level: interaction between nitrogen compounds, cytokinins and carbon metabolism. Tree Physiol 24:1313–1321PubMedGoogle Scholar
  80. Goldschmidt EE, Samach A (2004) Aspects of flowering in fruit trees. In: Kang SM et al (eds) Proceedings of ths 9th IS on plant bioregulators. Acta Horticulture 653, pp 23–27Google Scholar
  81. Goldsmith MHM, Catealdo DA, Karn J, Brenneman T, Trip P (1974) The nonpolar transport of auxin in the phloem of intact Coleus plants. Planta 116:301–317CrossRefGoogle Scholar
  82. Gomez-Roldan V, Fermas S, Brewer PB, Puech-Pagès V, Dun EA, Pillot JP, Letisse F, Matusova R, Danoun S, Portais JC, Bouwmeester H, Bécard G, Beveridge CA, Rameau C, Rochange SF (2008) Strigolactone inhibition of shoot branching. Nature 455:189–194PubMedCrossRefGoogle Scholar
  83. Gordon D, Karbat I, Ilan N, Cohen L, Kahn R, Gilles N, Dong K, Stuhmer W, Tytgat J, Gurevitz M (2007) The differential preference of scorpion alpha-toxins for insect or mammalian sodium channels: implications for improved insect control. Toxicon 49:452–472PubMedCrossRefGoogle Scholar
  84. Grace LJ, Charity JA, Gresham B, Kay N, Walter C (2005) Insect-resistant transgenic Pinus radiata. Plant Cell Rep 24:103–111PubMedCrossRefGoogle Scholar
  85. Groover AT (2005) What genes make a tree? Trends Plant Sci 10:210–214PubMedCrossRefGoogle Scholar
  86. Groover A, Robischon M (2006) Developmental mechanisms regulating secondary growth in woody plants. Curr Opin Plant Biol 9:55–58PubMedCrossRefGoogle Scholar
  87. Gurevitz M, Karbat I, Cohen L, Ilan N, Kahn R, Turkov M, Stankiewicz M, Stuhmer W, Dong K, Gordon D (2007) The insecticidal potential of scorpion beta-toxins. Toxicon 49:473–489PubMedCrossRefGoogle Scholar
  88. Hacke UG, Sperry JS, Wheeler JK, Castro L (2006) Scaling of angiosperm xylem structure with safety and efficiency. Tree Physiol 26:689–701PubMedCrossRefGoogle Scholar
  89. Hagen G, Martin G, Li Y, Guilfoyle TJ (1991) Auxin-induced expression of the soybean GH3 promoter in transgenic tobacco plants. Plant Mol Biol 17:567–579PubMedCrossRefGoogle Scholar
  90. Hargreaves CL, Grace LJ, van der Maas SA, Menzies MI, Kumar S, Holden DG, Foggo MN, Low CB, Dibley MJ (2005) Comparative in vitro and early nursery performance of adventitious and axillary shoots from epicotyls of same zygotic embryo of control-pollinated Pinus radiata. Can J For Res 35:2629–2641CrossRefGoogle Scholar
  91. Hellgren JM, Olofsson K, Sundberg B (2004) Patterns of auxin distribution during gravitational induction of reaction wood in poplar and pine. Plant Physiol 135:212–220PubMedCrossRefGoogle Scholar
  92. Hess T, Sachs T (1972) The influence of a mature leaf on xylem differentiation. New Phytol 71:903–914CrossRefGoogle Scholar
  93. Hirota A, Kato T, Fukaki H, Aida M, Tasaka M (2007) The auxin-regulated AP2/EREBP gene PUCHI is required for morphogenesis in the early lateral root primordium of Arabidopsis. Plant Cell 19:2156–2168PubMedCrossRefGoogle Scholar
  94. Horner HT, Lersten NR, Wirth CL (1994) Quantitative survey of sieve tube distribution in foliar terminal veins of ten dicot species. Am J Bot 81:1267–1274CrossRefGoogle Scholar
  95. Hou H-W, Zhou Y-T, Mwange K-N, Li W-F, He X-Q, Cui K-M (2006) ABP1 expression regulated by IAA and ABA is associated with the cambium periodicity in Eucommia ulmoides Oliv. J Exp Bot 57:3857–3867PubMedCrossRefGoogle Scholar
  96. Howe GA (2004) Jasmonates. In: Davies PJ (ed) Plant hormones: biosynthesis, signal transduction, action! Kluwer, Dordrecht, pp 610–634Google Scholar
  97. Huber DP, Philippe RN, Madilao LL, Sturrock RN, Bohlmann J (2005) Changes in anatomy and terpene chemistry in roots of Douglas-fir seedlings following treatment with methyl jasmonate. Tree Physiol 25:1075–1083PubMedCrossRefGoogle Scholar
  98. Hudgins JW, Franceschi VR (2004) Methyl jasmonate-induced ethylene production is responsible for conifer phloem defense responses and reprogramming of stem cambial zone for traumatic resin duct formation. Plant Physiol 135:2134–2149PubMedCrossRefGoogle Scholar
  99. Hudgins JW, Christiansen E, Franceschi VR (2003) Methyl jasmonate induces changes mimicking anatomical defenses in diverse members of the Pinaceae. Tree Physiol 23:361–371PubMedCrossRefGoogle Scholar
  100. Hudgins JW, Ralph SG, Franceschi VR, Bohlmann J (2006) Ethylene in induced conifer defense: cDNA cloning, protein expression, and cellular and subcellular localization of 1-aminocyclopropane-1-carboxylate oxidase in resin duct and phenolic parenchyma cells. Planta 224:865–877PubMedCrossRefGoogle Scholar
  101. Israelsson M, Sundberg B, Moritz T (2005) Tissue-specific localization of gibberellins and expression of gibberellin-biosynthetic and signaling genes in wood-forming tissues in aspen. Plant J 44:494–504PubMedCrossRefGoogle Scholar
  102. Iwasaki T, Shibaoka H (1991) Brassinosteroids act as regulators of tracheary-element differentiation in isolated Zinnia mesophyll cells. Plant Cell Physiol 32:1007–1014Google Scholar
  103. Jacobs WP (1952) The role of auxin in differentiation of xylem around a wound. Am J Bot 39:301–309CrossRefGoogle Scholar
  104. Jiang S, Xu K, Wang YZ, Ren YP, Gu S (2008) Role of GA3, GA4 and uniconazole-P in controlling gravitropism and tension wood formation in Fraxinus mandshurica Rupr. var. japonica Maxim. seedlings. J Integr Plant Biol 50:19–28PubMedCrossRefGoogle Scholar
  105. Jung JH, Park CM (2007) Vascular development in plants: specification of xylem and phloem tissues. J Plant Biol 50:301–305CrossRefGoogle Scholar
  106. Kalev N, Aloni R (1998) Role of auxin and gibberellin in regenerative differentiation of tracheids in Pinus pinea L. seedlings. New Phytol 138:461–468CrossRefGoogle Scholar
  107. Keeling CI, Bohlmann J (2006) Genes, enzymes and chemicals of terpenoid diversity in the constitutive and induced defence of conifers against insects and pathogens. New Phytol 170:657–675PubMedCrossRefGoogle Scholar
  108. Klee H (2008) Evidence points to the existence of a hitherto uncharacterized type of hormone that controls different aspects of plant growth and interaction. The hunt for that hormone is heating up. Nature 455:176–177PubMedCrossRefGoogle Scholar
  109. Klee HJ, Horsch RB, Hinchee MA, Hein MB, Hoffmann MB (1987) The effects of overproduction of two Agrobacterium tumefaciens T-DNA auxin biosynthetic gene products in transgenic petunia plants. Genes Dev 1:86–96CrossRefGoogle Scholar
  110. Kleine-Vehn J, Wabnik K, Martinière A, Łangowski Ł, Willig K, Naramoto S, Leitner J, Tanaka H, Jakobs S, Robert S, Luschnig C, Govaerts W, Hell SW, Runions J, Friml J (2011) Recycling, clustering, and endocytosis jointly maintain PIN auxin carrier polarity at the plasma membrane. Mol Syst Biol 7:540PubMedCrossRefGoogle Scholar
  111. Kohlen W, Charnikhova T, Liu Q, Bours R, Domagalska MA, Beguerie S, Verstappen F, Leyser O, Bouwmeester H, Ruyter-Spira C (2011) Strigolactones are transported through the xylem and play a key role in shoot architectural response to phosphate deficiency in nonarbuscular mycorrhizal host Arabidopsis. Plant Physiol 155:974–987PubMedCrossRefGoogle Scholar
  112. Koiwai H, Nakaminami K, Seo M, Mitsuhashi W, Toyomasu T, Koshiba T (2004) Tissue-specific localization of an abscisic acid biosynthetic enzyme, AAO3, in Arabidopsis. Plant Physiol 134:1697–1707PubMedCrossRefGoogle Scholar
  113. Kramer EM (2006) Wood grain pattern formation: a brief review. J Plant Growth Regul 25:290–301CrossRefGoogle Scholar
  114. Kramer EM, Borkowski MH (2004) Wood grain patterns at branch junctions: modeling and implications. Trees 18:493–500CrossRefGoogle Scholar
  115. Kudo T, Kiba T, Sakakibara H (2010) Metabolism and long-distance translocation of cytokinins. J Integr Plant Biol 52:53–60PubMedCrossRefGoogle Scholar
  116. Kuroha T, Satoh S (2007) Involvement of cytokinins in adventitious and lateral root formation. Plant Root 1:27–33CrossRefGoogle Scholar
  117. Larkin PJ, Gibson JM, Mathesius U, Weinmann JJ, Gärtner E, Hall E, Tanner GJ, Rolfe BG, Djordjevic MA (1996) Transgenic white clover. Studies with the auxin-responsive promoter, GH3, in root gravitropism and lateral root development. Transgenic Res 5:325–335PubMedCrossRefGoogle Scholar
  118. Larson PR (1969) Wood formation and the concept of wood quality. Yale University School of Forestry Bulletin 74, New HavenGoogle Scholar
  119. Larson PR (1994) The vascular cambium: development and structure. Springer, BerlinCrossRefGoogle Scholar
  120. Lechowicz MJ (1984) Why do temperate deciduous trees leaf out at different times? Adaptation and ecology of forest communities. Am Nat 124:821–842CrossRefGoogle Scholar
  121. Leitch MA (2001) Vessel-element dimensions and frequency within the most current growth increment along the length of Eucalyptus globules stems. Trees 15:353–357CrossRefGoogle Scholar
  122. Lersten NR (1990) Sieve tubes in foliar vein endings: review and quantitative survey of Rudbeckia laciniata (Asteraceae). Am J Bot 77:1132–1141CrossRefGoogle Scholar
  123. Lersten NR, Curtis JD (1993) Paraveinal mesophyll in Calliandra tweedii and C. emarginata (Leguminosa; Mimosoideae). Am J Bot 80:561–568CrossRefGoogle Scholar
  124. Lev-Yadun S, Aloni R (1990) Vascular differentiation in branch junctions of trees: circular patterns and functional significance. Trees 4:49–54CrossRefGoogle Scholar
  125. Lev-Yadun S, Aloni R (1995) Differentiation of the ray system in woody plants. Bot Rev 61:45–84CrossRefGoogle Scholar
  126. Li S, Pezeshki SR, Shields FD (2006) Partial flooding enhances aeration in adventitious roots of black willow (Salix nigra) cuttings. J Plant Physiol 163:619–628PubMedCrossRefGoogle Scholar
  127. Liphschitz N (1995) Ecological wood anatomy: changes in xylem structure in Israeli trees. In: Shuming W (ed) Wood anatomy research 1995. Proceedings of the international symposium on tree anatomy and wood formation, Tianjin, China. International Academic Publishers, Beijing, pp 12–15Google Scholar
  128. Ljung K, Hull AK, Kowalczyk M, Marchant A, Celenza J, Cohen JD, Sandberg G (2002) Biosynthesis, conjugation, catabolism and homeostasis of indol-3-acetic acid in Arabidopsis. Plant Mol Biol 50:309–332CrossRefGoogle Scholar
  129. López-Ráez JA, Charnikhova T, Gómez-Roldán V, Matusova R, Kohlen W, De Vos R, Verstappen F, Puech-Pages V, Bécard G, Mulder P, Bouwmeester H (2008) Tomato strigolactones are derived from carotenoids and their biosynthesis is promoted by phosphate starvation. New Phytol 178:863–874PubMedCrossRefGoogle Scholar
  130. Love J, Bjorklund S, Vahala J, Hertzberg M, Kangasjarvi J, Sundberg B (2009) Ethylene is an endogenous stimulator of cell division in the cambial meristem of Populus. Proc Natl Acad Sci USA 106:5984–5989PubMedCrossRefGoogle Scholar
  131. Ludwig-Müller J (2011) Auxin conjugates: their role for plant development and in the evolution of land plants. J Exp Bot 62:1757–1773PubMedCrossRefGoogle Scholar
  132. Matsumoto-Kitano M, Kusumoto T, Tarkowski P, Kinoshita-Tsujimura K, Václavíková K, Miyawaki K, Kakimoto T (2008) Cytokinins are central regulators of cambial activity. Proc Natl Acad Sci USA 105:20027–20031PubMedCrossRefGoogle Scholar
  133. Matte Risopatron JP, Sun Y, Jones BJ (2010) The vascular cambium: molecular control of cellular structure. Protoplasma 247:145–161PubMedCrossRefGoogle Scholar
  134. Mattsson J, Sung ZR, Berleth T (1999) Responses of plant vascular systems to auxin transport inhibition. Development 126:2979–2991PubMedGoogle Scholar
  135. Mertens R, Eberle J, Arnscheidt A, Ledebur A, Weiler EW (1985) Monoclonal antibodies to plant growth regulators. II. Indole-3-acetic acid. Planta 166:389–393CrossRefGoogle Scholar
  136. Miyawaki K, Matsumoto-Kitano M, Kakimoto T (2004) Expression of cytokinin biosynthetic isopentenyltransferase genes in Arabidopsis: tissue specificity and regulation by auxin, cytokinin, and nitrate. Plant J 37:128–138PubMedCrossRefGoogle Scholar
  137. Morris DA, Kadir GO, Barry AJ (1973) Auxin transport in intact pea seedlings (Pisum sativum L.): the inhibition of transport by 2,3,5-triiodobenzoic acid. Planta 110:173–182CrossRefGoogle Scholar
  138. Moubayidin L, Di Mambro R, Sabatini S (2009) Cytokinin-auxin crosstalk. Trends Plant Sci 14:557–562PubMedCrossRefGoogle Scholar
  139. Muday GK, Rahman A, Binder BM (2012) Auxin and ethylene: collaborators or competitors? Trends Plant Sci 17:181–195PubMedCrossRefGoogle Scholar
  140. Müller A, Düchting P, Weiler EW (2002) A multiplex GC-MS/MS technique for the sensitivity and qualitative single-run analysis of acidic phytohormones and related compounds, and its application to Arabidopsis thaliana. Planta 216:44–56PubMedCrossRefGoogle Scholar
  141. Nieminen K, Immanen J, Laxell M, Kauppinen L, Tarkowski P, Dolezal K, Tähtiharju S, Elo A, Decourteix M, Ljung K, Bhalerao R, Keinonen K, Albert VA, Helariutta Y (2008) Cytokinin signaling regulates cambial development in poplar. Proc Natl Acad Sci USA 105:20032–20037PubMedCrossRefGoogle Scholar
  142. Nieminen K, Robischon M, Immanen J, Helariutta Y (2012) Towards optimizing wood development in bioenergy trees. New Phytol 194:46–53PubMedCrossRefGoogle Scholar
  143. Nugroho WD, Yamagishi Y, Nakaba S, Fukuhara S, Begum S, Sri Nugroho Marsoem SN, Ko J-H, Jin H-O, Funada R (2012) Gibberellin is required for the formation of tension wood and stem gravitropism in Acacia mangium seedlings. Ann Bot 110(4):887–895PubMedCrossRefGoogle Scholar
  144. Oda Y, Fukuda H (2012) Secondary cell wall patterning during xylem differentiation. Curr Opin Plant Biol 15:38–44PubMedCrossRefGoogle Scholar
  145. Olson ME, Rosell JA (2013) Vessel diameter-stem diameter scaling across woody angiosperms and the ecological causes of xylem vessel diameter variation. New Phytol 197:1204–1213PubMedCrossRefGoogle Scholar
  146. Palme P, Gälweiler L (1999) PIN-pointing the molecular basis of auxin transport. Curr Opin Plant Biol 2:375–381PubMedCrossRefGoogle Scholar
  147. Palni LMS, Burch L, Horgan R (1988) The effect of auxin concentration on cytokinin stability and metabolism. Planta 174:231–234CrossRefGoogle Scholar
  148. Pesquet E, Tuominen H (2011) Ethylene stimulates tracheary element differentiation in Zinnia elegans cell cultures. New Phytol 190:138–149CrossRefGoogle Scholar
  149. Priestley JH, Scott LI (1936) A note upon summer wood production in the tree. Proc Leeds Phil Soc 3:235–248Google Scholar
  150. Ragni L, Nieminen K, Pacheco-Villalobos D, Sibout R, Schwechheimer C, Hardtke CS (2011) Mobile gibberellin directly stimulates Arabidopsis hypocotyl xylem expansion. Plant Cell 23:1322–1336PubMedCrossRefGoogle Scholar
  151. Rahayu YS, Walch-Liu P, Neumann G, Römheld V, von Wirén N, Bangerth F (2005) Root-derived cytokinins as long-distance signals for NO3- -induced stimulation of leaf growth. J Exp Bot 56:1143–1152PubMedCrossRefGoogle Scholar
  152. Ralph SG, Hudgins JW, Jancsik S, Franceschi VR, Bohlmann J (2007) Aminocyclopropane carboxylic acid synthase is a regulated step in ethylene-dependent induced conifer defense. Full-length cDNA cloning of a multigene family, differential constitutive, and wound- and insect-induced expression, and cellular and subcellular localization in spruce and Douglas fir. Plant Physiol 143:410–424PubMedCrossRefGoogle Scholar
  153. Rathgeber CB, Rossi S, Bontemps JD (2011) Cambial activity related to tree size in a mature silver-fir plantation. Ann Bot 108:429–438PubMedCrossRefGoogle Scholar
  154. Raven PH, Evert RF, Eichhorn SE (2005) Biology of plants, 7th edn. Freeman, New YorkGoogle Scholar
  155. Reinhardt D, Pesce E-R, Stieger P, Mandel T, Baltensperger K, Bennett M, Traas J, Friml J, Kuhlemeier C (2003) Regulation of phyllotaxis by polar auxin transport. Nature 426:255–260PubMedCrossRefGoogle Scholar
  156. Roberts LW, Gahan BP, Aloni R (1988) Vascular differentiation and plant growth regulators. Springer, BerlinCrossRefGoogle Scholar
  157. Romano CP, Hein MB, Klee HJ (1991) Inactivation of auxin in tobacco transformed with the indoleacetic acid-lysine synthetase gene of Pseudomonas savastanoi. Genes Dev 5:438–446PubMedCrossRefGoogle Scholar
  158. Ruffel S, Krouk G, Ristova D, Shasha D, Birnbaum KD, Coruzzi GM (2011) Nitrogen economics of root foraging: transitive closure of the nitrate–cytokinin relay and distinct systemic signaling for N supply vs. demand. Proc Natl Acad Sci USA 108:18524–18529PubMedCrossRefGoogle Scholar
  159. Runions J, Friml J (2011) Recycling, clustering, and endocytosis jointly maintain PIN auxin carrier polarity at the plasma membrane. Mol Syst Biol 7:540PubMedGoogle Scholar
  160. Sachs T (1981) The control of patterned differentiation of vascular tissues. Adv Bot Res 9:151–262CrossRefGoogle Scholar
  161. Sachs T (1991) Callus and tumor development. In: Sachs T (ed) Pattern formation in plant tissues. Cambridge University Press, Cambridge, pp 38–55CrossRefGoogle Scholar
  162. Sachs T (2000) Integrating cellular and organismal aspects of vascular differentiation. Plant Cell Physiol 41:649–656PubMedCrossRefGoogle Scholar
  163. Sachs T, Cohen D (1982) Circular vessels and the control of vascular differentiation in plants. Differentiation 21:22–26CrossRefGoogle Scholar
  164. Sakakibara H, Takei K, Hirose N (2006) Interactions between nitrogen and cytokinin in the regulation of metabolism and development. Trends Plant Sci 11:440–448PubMedCrossRefGoogle Scholar
  165. Saks Y, Feigenbaum P, Aloni R (1984) Regulatory effect of cytokinin on secondary xylem fiber formation in an in vivo system. Plant Physiol 76:638–642PubMedCrossRefGoogle Scholar
  166. Salleo S, LoGullo MA, Siracusano L (1984) Distribution of vessel ends in stems of some diffuse and ring-porous trees: the nodal region as ‘safety zones’ of the water conducting system. Ann Bot 54:543–552Google Scholar
  167. Sauer M, Balla J, Luschnig C, Wisniewska J, Reinöhl V, Friml J, Benková E (2006) Canalization of auxin flow by Aux/IAA-ARF-dependent feedback regulation of PIN polarity. Genes Dev 20:2902–2911PubMedCrossRefGoogle Scholar
  168. Savaldi-Goldstein S, Peto C, Chory J (2007) The epidermis both drives and restricts plant shoot growth. Nature 446:199–202PubMedCrossRefGoogle Scholar
  169. Savidge RA (1996) Xylogenesis, genetic and environmental regulation. IAWA J 17:269–310Google Scholar
  170. Scarpella E, Helariutta Y (2010) Vascular pattern formation in plants. Curr Top Dev Biol 91:221–265PubMedCrossRefGoogle Scholar
  171. Scarpella E, Marcos D, Friml J, Berleth T (2006) Control of leaf vascular patterning by polar auxin transport. Genes Dev 20:1015–1027PubMedCrossRefGoogle Scholar
  172. Scheres B, Xu J (2006) Polar auxin transport and patterning: grow with the flow. Genes Dev 20:922–926PubMedCrossRefGoogle Scholar
  173. Schmidt A, Nagel R, Krekling T, Christiansen E, Gershenzon J, Krokene P (2011) Induction of isoprenyl diphosphate synthases, plant hormones and defense signalling genes correlates with traumatic resin duct formation in Norway spruce (Picea abies). Plant Mol Biol 77:577–590PubMedCrossRefGoogle Scholar
  174. Schrader J, Baba K, May ST, Palme K, Bennet M, Bhalerao RP, Sandberg G (2003) Polar auxin transport in the wood-forming tissue of hybrid aspen is under simultaneous control of developmental and environmental signals. Proc Natl Acad Sci USA 100:10096–10101PubMedCrossRefGoogle Scholar
  175. Schwalm K, Aloni R, Langhans M, Heller W, Stich S, Ullrich CI (2003) Flavonoid-related regulation of auxin accumulation in Agrobacterium tumefaciens-induced plant tumors. Planta 218:163–178PubMedCrossRefGoogle Scholar
  176. Sehr EM, Agusti J, Lehner R, Farmer EE, Schwarz M, Greb T (2010) Analysis of secondary growth in the Arabidopsis shoot reveals a positive role of jasmonate signalling in cambium formation. Plant J 63:811–822PubMedCrossRefGoogle Scholar
  177. Sieburth LE (1999) Auxin is required for leaf vein pattern in Arabidopsis. Plant Physiol 121:1179–1190PubMedCrossRefGoogle Scholar
  178. Sieburth LE, Deyholos MK (2006) Vascular development: the long and winding road. Curr Opin Plant Biol 9:48–54PubMedCrossRefGoogle Scholar
  179. Spicer R, Groover A (2010) Evolution of development of vascular cambia and secondary growth. New Phytol 186:577–592PubMedCrossRefGoogle Scholar
  180. Sundberg B, Uggla C, Tuominen H (2000) Cambial growth and auxin gradients. In: Savidge RA, Barnett JR, Napier R (eds) Cell and molecular biology of wood formation. BIOS Scientific Publishers, Oxford, pp 169–188Google Scholar
  181. Suzuki M, Yoda K, Suzuki H (1996) Phenological comparison of the onset of vessel formation between ring-porous and diffuse-porous deciduous trees in a Japanese temperate forest. IAWA J 17:431–444Google Scholar
  182. Swarup R, Friml J, Marchant A, Ljung K, Sandberg G, Palme K, Bennett M (2001) Localization of the auxin permease AUX1 suggests two functionally distinct hormone transport pathways operate in the Arabidopsis root apex. Genes Dev 15:2648–2653PubMedCrossRefGoogle Scholar
  183. Taiz L, Zeiger E (2006) Plant physiology, 4th edn. Sinauer, Sunderland, MAGoogle Scholar
  184. Takei K, Sakakibara H, Taniguchi M, Sugiyama T (2001) Nitrogen-dependent accumulation of cytokinins in root and the translocation to leaf: implication of cytokinin species that induces gene expression of maize response regulator. Plant Cell Physiol 42:85–93PubMedCrossRefGoogle Scholar
  185. Takei K, Ueda N, Aoki K, Kuromori T, Hirayama T, Shinozaki K, Yamaya T, Sakakibara H (2004) AtIPT3 is a key determinant of nitrate-dependent cytokinin biosynthesis in Arabidopsis. Plant Cell Physiol 45:1053–1062PubMedCrossRefGoogle Scholar
  186. Tanaka M, Takei K, Kojima M, Sakakibara H, Mori H (2006) Auxin controls local cytokinin biosynthesis in the nodal stem in apical dominance. Plant J 45:1028–1036PubMedCrossRefGoogle Scholar
  187. Teale WD, Paponov IA, Palme K (2006) Auxin in action: signalling, transport and the control of plant growth and development. Nat Rev Mol Cell Biol 7:847–859PubMedCrossRefGoogle Scholar
  188. Thorpe MR, Ferrieri AP, Herth MM, Ferrieri RA (2007) 11C-imaging: methyl jasmonate moves in both phloem and xylem, promotes transport of jasmonate, and of photoassimilate even after proton transport is decoupled. Planta 226:541–551PubMedCrossRefGoogle Scholar
  189. Timell TE (1986) Compression wood in gymnosperms, vol 2. Springer, BerlinGoogle Scholar
  190. Tokunaga N, Uchimura N, Sato Y (2006) Involvement of gibberellin in tracheary element differentiation and lignification in Zinnia elegans xylogenic culture. Protoplasma 228:179–187PubMedCrossRefGoogle Scholar
  191. Trewavas AJ (1983) Is plant development regulated by changes in concentration of growth substances or by changes in the sensitivity to growth substances? TIBS 8:354–357Google Scholar
  192. Turner S, Sieburth LE (2003) Vascular patterning. In: Somerville CR, Meyerowitz EM (eds) The Arabidopsis book, vol 2. American Society of Plant Biologists, Rockville, MD. doi: 10.1199/tab.0073, Google Scholar
  193. Turner S, Gallois P, Brown D (2007) Tracheary element differentiation. Annu Rev Plant Biol 58:407–433PubMedCrossRefGoogle Scholar
  194. Tyree MT, Zimmermann MH (2002) Xylem structure and the ascent of Sap, 2nd edn. Springer, BerlinCrossRefGoogle Scholar
  195. Uggla C, Moritz T, Sandberg G, Sundberg B (1996) Auxin as a positional signal in pattern formation in plants. Proc Natl Acad Sci USA 93:9282–9286PubMedCrossRefGoogle Scholar
  196. Uggla C, Mellerowicz EJ, Sundberg B (1998) Indole-3-acetic acid controls cambial growth in Scots pine by positional signaling. Plant Physiol 117:113–121PubMedCrossRefGoogle Scholar
  197. Ullrich CI, Aloni R (2000) Vascularization is a general requirement for growth of plant and animal tumours. J Exp Bot 51:1951–1960PubMedCrossRefGoogle Scholar
  198. Ulmasov T, Murfett J, Hagen G, Guilfoyle TJ (1997) Aux/IAA proteins repress expression of reporter genes containing natural and highly active synthetic auxin response elements. Plant Cell 9:1963–1971PubMedGoogle Scholar
  199. Umehara M, Hanada A, Yoshida S, Akiyama K, Arite T, Takeda-Kamiya N, Magome H, Kamiya Y, Shirasu K, Yoneyama K, Kyozuka J, Yamaguchi S (2008) Inhibition of shoot branching by new terpenoid plant hormones. Nature 455:195–200PubMedCrossRefGoogle Scholar
  200. Ursache R, Nieminen K, Helariutta Y (2012) Genetic and hormonal regulation of cambial development. Physiol Plant 147:36–45Google Scholar
  201. Wabnik K, Kleine-Vehn J, Balla J, Sauer M, Naramoto S, Reinöhl V, Merks RM, Govaerts W, Friml J (2010) Emergence of tissue polarization from synergy of intracellular and extracellular auxin signaling. Mol Syst Biol 6:447PubMedCrossRefGoogle Scholar
  202. Wächter R, Fischer K, Gäbler R, Kühnemann F, Urban W, Bögemann GM, Voesenek LACJ, Blom CWPM, Ullrich CI (1999) Ethylene production and ACC-accumulation in Agrobacterium tumefaciens-induced plant tumours and their impact on tumour and host stem structure and function. Plant Cell Environ 22:1263–1273CrossRefGoogle Scholar
  203. Wheeler EA, Baas P (1991) A survey of the fossil record for dicotyledonous wood and its significance for evolutionary and ecological wood anatomy. IAWA Bull ns 12:275–332Google Scholar
  204. Xue-Xuan X, Hong-Bo S, Yuan-Yuan M, Gang X, Jun-Na S, Dong-Gang G, Cheng-Jiang R (2010) Biotechnological implications from abscisic acid (ABA) roles in cold stress and leaf senescence as an important signal for improving plant sustainable survival under abiotic-stressed conditions. Crit Rev Biotechnol 30:222–230PubMedCrossRefGoogle Scholar
  205. Yamaguchi M, Goué N, Igarashi H, Ohtani M, Nakano Y, Mortimer JC, Nishikubo N, Kubo M, Katayama Y, Kakegawa K, Dupree P, Demura T (2010a) VASCULAR-RELATED NAC-DOMAIN6 and VASCULAR-RELATED NAC-DOMAIN7 effectively induce transdifferentiation into xylem vessel elements under control of an induction system. Plant Physiol 153:906–914PubMedCrossRefGoogle Scholar
  206. Yamaguchi M, Ohtani M, Mitsuda N, Kubo M, Ohme-Takagi M, Fukuda H, Demura T (2010b) VND-INTERACTING2, a NAC domain transcription factor, negatively regulates xylem vessel formation in Arabidopsis. Plant Cell 22:1249–1263PubMedCrossRefGoogle Scholar
  207. Yamaguchi M, Mitsuda N, Ohtani M, Ohme-Takagi M, Kato K, Demura T (2011) VASCULAR-RELATED NAC-DOMAIN7 directly regulates the expression of a broad range of genes for xylem vessel formation. Plant J 66:579–590PubMedCrossRefGoogle Scholar
  208. Yamamoto F, Angeles G, Kozlowski TT (1987) Effect of ethrel on stem anatomy of Ulmus americana seedlings. IAWA Bull NS 8:3–9Google Scholar
  209. Yamamoto F, Kozlowski TT (1987) Effect of ethrel on growth and stem anatomy of Pinus halepensis seedlings. IAWA Bull ns 8:11–19Google Scholar
  210. Yamamoto R, Demura T, Fukuda H (1997) Brassinosteroids induce entry into the final stage of tracheary element differentiation in cultured Zinnia cells. Plant Cell Physiol 38:980–983PubMedCrossRefGoogle Scholar
  211. Yamamoto R, Fujioka S, Demura T, Takatsuto S, Yoshida S, Fukuda H (2001) Brassinosteroid levels increase drastically prior to morphogenesis of tracheary elements. Plant Physiol 125:556–563PubMedCrossRefGoogle Scholar
  212. Zhang R, Zhang X, Wang J, Letham DS, McKinney SA, Higgins TJV (1995) The effect of auxin on cytokinin levels and metabolism in transgenic tobacco tissue expressing an ipt gene. Planta 196:84–94CrossRefGoogle Scholar
  213. Zhang S, Wei Y, Lu Y, Wang X (2009) Mechanisms of brassinosteroids interacting with multiple hormones. Plant Signal Behav 12:1117–1120CrossRefGoogle Scholar
  214. Zhang J, Elo A, Helariutta Y (2011) Arabidopsis as a model for wood formation. Curr Opin Biotechnol 22:293–299PubMedCrossRefGoogle Scholar
  215. Zimmermann MH (1983) Xylem structure and the ascent of sap. Springer, BerlinGoogle Scholar
  216. Zimmermann MH, Jeje AA (1981) Vessel-length distribution in stems of some American woody plants. Can J Bot 59:1882–1892CrossRefGoogle Scholar
  217. Zobel BJ, van Buijtenen JP (1989) Wood variation, its causes and control. Springer, BerlinCrossRefGoogle Scholar

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© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  1. 1.Department of Molecular Biology and Ecology of PlantsTel Aviv UniversityTel AvivIsrael

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