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Morpho-Anatomical Traits for Plant Adaptation to Drought

  • Veronica De MiccoEmail author
  • Giovanna Aronne
Chapter

Abstract

Plant resistance to drought relies on adaptive strategies based on the timing of phenophases and on the presence of structural traits mainly related to: (1) increase of water uptake and storage; (2) reduction of water loss during dry periods; and (3) mechanical reinforcement of tissues to prevent wilting that may lead to irreversible collapse and damage of cells. In this chapter, after a few evolutionary considerations, we focus on the adaptive value of the main phenological, morphological and anatomical properties. We report the common existence of such traits in both desert and semiarid environments, especially in Mediterranean-type ecosystems. All morpho-anatomical characteristics are interpreted considering that plant resistance to drought also depends on the ability to respond to multiple stressors. We conclude that various combinations of anatomical features can contribute in different degrees to the adaptive capacity of plants to drought.

Keywords

Drought Condition Cambial Activity Wood Anatomy Reduce Water Loss Semiarid Environment 
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.

References

  1. Arena C, Vitale L, De Santo Virzo A (2008) Paraheliotropism in Robinia pseudoacacia L.: an efficient strategy to optimise photosynthetic performance under natural environmental conditions. Plant Biol 10:194–201PubMedCrossRefGoogle Scholar
  2. Aronne G, De Micco V (2001) Seasonal dimorphism in the Mediterranean Cistus incanus L. subsp. incanus. Ann Bot-London 87(6):789–794Google Scholar
  3. Aronne G, De Micco V (2004) Hypocotyl features of Myrtus communis L. (Myrtaceae): a manysided strategy for possible enhancement of seedling establishment in the Mediterranean environment. Bot J Linn Soc 145:195–202CrossRefGoogle Scholar
  4. Aronne G, Wilcock CC (1994) Reproductive characteristics and breeding system of shrubs of the Mediterranean region. Funct Ecol 8:69–76CrossRefGoogle Scholar
  5. Aronne G, Wilcock CC (1997) Reproductive phenology in Mediterranean macchia vegetation. Lagascalia 19(1–2):445–454Google Scholar
  6. Aronson J, Kigel J, Shmida A, Klein J (1992) Adaptive phenology of desert and Mediterranean populations of annual plants grown with and without water stress. Oecologia 89:17–26CrossRefGoogle Scholar
  7. Atjay GL, Ketner P, Duvigneaud P (1979) Terrestrial primary production and phytomass. In: Bolin B, Degens ET, Kempe S, Ketner P (eds) The global carbon cycle, SCOPE Report 13. Wiley, UK, pp 129–181Google Scholar
  8. Baas P (1986) Ecological patterns in xylem anatomy. In: Givnish TJ (ed) On the economy of plant form and function. Cambridge University Press, Cambridge, pp 327–352Google Scholar
  9. Baas P, Schweingruber FH (1987) Ecological trends in the wood anatomy of trees, shrubs and climbers from Europe. IAWA Bull n s 8(3):245–274Google Scholar
  10. Baas P, Werker E, Fahn A (1983) Some ecological trends in vessel characters. IAWA Bull n s 4(2–3):141–159Google Scholar
  11. Baas P, Ewers FW, Davis SD, Wheeler EA (2004) Evolution of xylem physiology. In: Hemsley A, Poole I (eds) The evolution of plant physiology. Elsevier Scientific Publishing Company, Amsterdam, pp 273–295CrossRefGoogle Scholar
  12. Bailey IW, Tupper WW (1918) Size variation in tracheary cells. I. A comparison between the secondary xylem of vascular cryptogams, gymnosperms and angiosperms. In: Proceedings of the American Academy of Arts and Sciences 54:149–204Google Scholar
  13. Bargel H, Barthlott W, Koch K, Schreiber L, Neinhuis C (2004) Plant cuticles: multifunctional interfaces between plant and environment. In: Hemsley A, Poole I (eds) The evolution of plant physiology. Elsevier Scientific Publishing Company, Amsterdam, pp 273–295Google Scholar
  14. Bateman RM, Crane PR, Di Michele WA, Kenrick PR, Rowe NP, Speck T, Stein WE (1998) Early evolution of land plants. Annu Rev Ecol Syst 29:263–292CrossRefGoogle Scholar
  15. Battipaglia G, De Micco V, Brand WA, Linke P, Aronne G, Saurer M, Cherubini P (2010) Variations of vessel diameter and δ13C in false rings of Arbutus unedo L. reflect different environmental conditions. New Phytol 188(4):1099–1112PubMedCrossRefGoogle Scholar
  16. Blum A (1996) Crop responses to drought and the interpretation of adaptation. Plant Growth Regul 20:135–148CrossRefGoogle Scholar
  17. Bongers JM (1973) Epidermal leaf characters of the winteraceae. Blumea 21:381–411Google Scholar
  18. Brodribb TJ (2009) Xylem hydraulic physiology: the functional backbone of terrestrial plant productivity. Plant Sci 177:245–251CrossRefGoogle Scholar
  19. Brodribb TJ, Field TS (2000) Stem hydraulic supply is linked to leaf photosynthetic capacity: evidence from new Caledonian and Tasmanian rainforests. Plant Cell Environ 23:1381–1388CrossRefGoogle Scholar
  20. Brodribb TJ, Field TS, Sack L (2010) Viewing leaf structure and evolution from a hydraulic perspective. Funct Plant Biol 37:488–498CrossRefGoogle Scholar
  21. Carlquist S (1975) Ecological strategies of xylem evolution. University of California Press, BerkeleyGoogle Scholar
  22. Carlquist S (1988) Comparative wood anatomy. Systematic, ecological, and evolutionary aspects of dicotyledon wood. Springer, BerlinGoogle Scholar
  23. Carlquist S (1989) Adaptive wood anatomy of chaparral shrubs. In: Keely JE (ed) The California chaparral: paradigms re-examined. Los Angeles Country Museum of Natural History Contributions, Los Angeles, pp 25–35Google Scholar
  24. Chaves MM, Maroco JP, Pereira JS (2003) Understanding plant responses to drought: from genes to the whole plant. Funct Plant Biol 30:239–264CrossRefGoogle Scholar
  25. Cherubini P, Gartner BL, Tognetti R, Bräker OU, Schoch W, Innes JL (2003) Identification, measurement and interpretation of tree rings in woody species from Mediterranean climates. Biol Rev 78:119–148PubMedCrossRefGoogle Scholar
  26. Christman MA, Sperry JS (2010) Single-vessel flow measurements indicate scalariform perforation plates confer higher flow resistance than previously estimated. Plant Cell Environ 33:431–443PubMedCrossRefGoogle Scholar
  27. Davis SD (1989) Patterns in mixed chaparral stands: differential water status and seedling survival during summer drought. In: Keeley SC (ed) The California chaparral: paradigms re-examined. Natural History Museum of Los Angeles County, Los Angeles, pp 97–105Google Scholar
  28. De Micco V, Aronne G (2007) Anatomical features, monomer lignin composition and accumulation of phenolics in one-year-old branches of the Mediterranean Cistus ladanifer L. Bot J Linn Soc 155:361–371CrossRefGoogle Scholar
  29. De Micco V, Aronne G (2008) Twig morphology and anatomy of Mediterranean trees and shrubs related to water availability. Bot Helv 118:139–148CrossRefGoogle Scholar
  30. De Micco V, Aronne G (2009) Seasonal dimorphism in wood anatomy of the Mediterranean Cistus incanus L. subsp incanus Trees-Struct Funct 23(5):981–989CrossRefGoogle Scholar
  31. De Micco V, Aronne G (2010) Root structure of Rumex scutatus L. growing on slopes. IAWA J 31(1):13–28Google Scholar
  32. De Micco V, Aronne G (2011). Anatomy and lignin characterization of twigs in the chaparral shrub Rhamnus californica. IAWA J in pressGoogle Scholar
  33. De Micco V, Saurer M, Aronne G, Tognetti R, Cherubini P (2007) Variations of wood anatomy and δ13C within tree rings of coastal Pinus pinaster Ait. showing intra-annual density fluctuations. IAWA J 28(1):61–74Google Scholar
  34. De Micco V, Aronne G, Baas P (2008) Wood anatomy and hydraulic architecture of stems and twigs of some Mediterranean trees and shrubs along a mesic-xeric gradient. Trees-Struct Funct 22:643–655CrossRefGoogle Scholar
  35. De Micco V, Battipaglia G, Brand WA, Linke P, Saurer M, Aronne G, Cherubini P (2012) Discrete versus continuous analysis of anatomical and δ13C variability in tree rings with intra-annual density fluctuations. Trees-Struct Funct 26:513–524CrossRefGoogle Scholar
  36. di Castri F, Goodall DW, Specht RL (eds) (1981) Ecosystems of the World 11, Mediterranean-Type Shrublands. Elsevier Scientific Publishing Company, Amsterdam, pp 309–315Google Scholar
  37. Eissenstat DM (1992) Costs and benefits of constructing roots of small diameter. J Plant Nutr 15:763–782CrossRefGoogle Scholar
  38. Fahn A (1964) Some anatomical adaptations in desert plants. Phytomorphology 14:93–102Google Scholar
  39. Field TS, Zwieniecki MA, Donoghue MJ, Holbrook NM (1998) Stomatal plugs of Drimys winteri (Winteraceae) protect leaves from mist but not drought. Proc Natl Acad Sci USA 95:14256–14259CrossRefGoogle Scholar
  40. Fenner M, Kitajima K (1999) Seed and seedling ecology. In: Pugnaire FI, Valladares F (eds) Handbook of functional plant ecology. Marcel-Dekker, New York, pp 589–621Google Scholar
  41. Franks SJ, Sim S, Weis EA (2007) Rapid evolution of flowering time by an annual plant in response to a climate fluctuation. Proc Natl Acad Sci USA 104:1278–1282PubMedCrossRefGoogle Scholar
  42. García-Fayos P, Verdú M (1998) Soil seed bank, factors controlling germination and establishment of a Mediterranean shrub: Pistacia lentiscus L. Acta Oecol 19:357–366CrossRefGoogle Scholar
  43. Graham LE (1993) The origin of land plants. Wiley, New YorkGoogle Scholar
  44. Grene R, Vasquez-Robinet C, Bohnert HJ (2011) Molecular biology and physiological genomics of dehydration stress. In: Lüttge U, Beck E, Bartels D (eds) Plant desiccation tolerance. Springer, Heidelberg, pp 255–288CrossRefGoogle Scholar
  45. Hacke UG, Sperry JS (2001) Functional and ecological xylem anatomy. Perspect Plant Ecol 4(2):97–115CrossRefGoogle Scholar
  46. Hose E, Clarkson DT, Steudle E, Hartung W (2001) The exodermis: a variable apoplastic barrier. J Exp Bot 52:2254–2264CrossRefGoogle Scholar
  47. Hulme M, Barrow EM, Arnell NW, Harrison PA, Johns TC, Downing TE (1999) Relative impacts of human-induced climate change and natural climate variability. Nature 397:688–691CrossRefGoogle Scholar
  48. Hunt ER, Zakir NJD, Nobel PS (1987) Water costs and water revenues for established and rain-induced roots of Agave deserti. Funct Ecol 1:125–130CrossRefGoogle Scholar
  49. Intergovernmental Panel on Climate Change (IPCC) (2007) Climate change 2007: mitigation. Contribution of working group III to the fourth assessment report of the intergovernmental panel on climate change. Cambridge University Press, CambridgeGoogle Scholar
  50. Jansen S, Choat B, Pletsers A (2009) Morphological variation of intervessel pit membranes and implications to xylem function in angiosperms. Am J Bot 96:409–419PubMedCrossRefGoogle Scholar
  51. Kohonen MM, Helland A (2009) On the function of wall sculpturing in xylem conduits. J Bionic Eng 6:324–329CrossRefGoogle Scholar
  52. Koster J, Baas P (1981) Alveolar cuticular material in Myristicaceae. In: Cutler D (ed) The Plant Cuticle. Academic, London, pp 131–138Google Scholar
  53. Kubiske ME, Abrams MD, Mostoller SA (1996) Stomatal and nonstomatal limitations of photosynthesis in relation to the drought and shade tolerance of tree species in open and understory environments. Trees-Struct Funct 11:76–82CrossRefGoogle Scholar
  54. Kummerow J (1981) Structure of roots and root systems. In: di Castri F, Goodall DW, Specht RL (eds) Ecosystems of the World 11, Mediterranean-type shrublands. Elsevier Scientific Publishing Company, Amsterdam, pp 269–288Google Scholar
  55. Kummerow J. (1989) Structural aspects of shrubs in Mediterranean-type plant communities. Options Méditerranéennes—Série Séminaires 3: 5–11Google Scholar
  56. Lamont BB (1983) Strategies for maximizing nutrient uptake in two Mediterranean ecosystems of low nutrient status. In: Kruger FJ, Mitchell DT, Jarvis JUM (eds) Mediterranean-type ecosystems: the role of nutrients. Springer, Berlin, pp 246–273CrossRefGoogle Scholar
  57. Lens F, Sperry JS, Christman MA, Choat B, Rabaey D, Jansen S (2011) Testing hypotheses that link wood anatomy to cavitation resistance and hydraulic conductivity in the genus Acer. New Phytol 190:709–723PubMedCrossRefGoogle Scholar
  58. Levitt J (1980) Response of plants to environmental stresses. Chilling, freezing, and high temperature stresses. Academic, New YorkGoogle Scholar
  59. Lewis MC (1972) The physiological significance of variation in leaf structure. Sci Progr Oxford 60:25–51Google Scholar
  60. Ludlow MM (1989) Strategies of response to water stress. In: Kreeb KH, Richter H, Hinckley TM (eds) Structural and functional responses to environmental stresses: water shortage. SPB Academic Publishing, The Hague, pp 269–281Google Scholar
  61. Matosevic I, Costa G, Giovannetti M (1997) The mycorrhizal status of the woody Mediterranean shrub Myrtus communis L. Mycorrhiza 7(1):51–53CrossRefGoogle Scholar
  62. Maximov NA (1931) The physiological significance of the xeromorphic structure of plants. J Ecol 19:272–282Google Scholar
  63. Mitrakos K (1980) A theory for Mediterranean plant life. Oecolog Plantar 15:245–252Google Scholar
  64. Miyazawa SI, Yoshimura S, Shinzaki Y, Maeshima M, Miyake C (2008) Deactivation of aquaporins decreases internal conductance to CO2 diffusion in tobacco leaves grown under long-term drought. Funct Plant Biol 35:556–564CrossRefGoogle Scholar
  65. Moles T, Westoby M (2004) What do seedlings die from and what are the implications for evolution of seed size? Oikos 106:193–199CrossRefGoogle Scholar
  66. Monneveux P, Belhassen E (1996) The diversity of drought adaptation in the wide. Plant Growth Regul 20:85–92CrossRefGoogle Scholar
  67. Moony HA, Dunn EL (1970) Photosynthetic systems of Mediterranean-climate shrubs and trees of California and Chile. Am Nat 104:447–453CrossRefGoogle Scholar
  68. Morison JIL, Morecroft MD (2006) Plant growth and climate change. Blackwell Publishing, OxfordCrossRefGoogle Scholar
  69. Mostajeran A, Rahimi-Eichi V (2008) Drought stress effects on root anatomical characteristics of rice cultivars (Oryza sativa L.). Pakistan J Biol Sci 11:2173–2183CrossRefGoogle Scholar
  70. Niinemets U (2001) Global-scale climatic controls of leaf dry mass per area, density, and thickness in trees and shrubs. Ecology 82:453–469CrossRefGoogle Scholar
  71. Niklas KJ (1986) Evolution of plant shape. Design constraints. Trends Ecol Evol 1(3):67–72PubMedCrossRefGoogle Scholar
  72. Niklas KJ (1992) Plant biomechanics: an engineering approach to plant form and function. University of Chicago Press, ChicagoGoogle Scholar
  73. North GB, Nobel PS (1992) Drought-induced changes in hydraulic conductivity and structure in roots of Ferocactus acanthodes and Opuntia ficus-indica. New Phytol 120:9–19CrossRefGoogle Scholar
  74. North GB, Nobel PS (1995) Hydraulic conductivity of concentric root tissues of Agave deserti Engelm. Under wet and drying conditions. New Phytol 130:47–57CrossRefGoogle Scholar
  75. North GB, Nobel PS (1996) Radial hydraulic conductivity of individual root tissues of Opuntia ficus-indica (L.) Miller as soil moisture varies. Ann Bot 77:133–142CrossRefGoogle Scholar
  76. Oguchi R, Hikosaka K, Hirose T (2005) Leaf anatomy as a constraint for photosynthetic acclimation: differential responses in leaf anatomy to increasing growth irradiance among three deciduous trees. Plant Cell Environ 28:916–927CrossRefGoogle Scholar
  77. Orshan G (1964) Seasonal dimorphism of desert and Mediterranean chamaephytes and its significance as a factor in their water economy. In: Rutter AJ, Whitehead FH (eds) The water relations of plants. Blackwell, Edinburgh, pp 206–222Google Scholar
  78. Padilla FM, Pugnaire FI (2007) Rooting depth and soil moisture control Mediterranean woody seedling survival during drought. Funct Ecol 21:489–495CrossRefGoogle Scholar
  79. Padilla FM, Miranda JD, Pugnaire FI (2007) Early root growth plasticity in seedlings of three Mediterranean woody species. Plant Soil 296:103–113CrossRefGoogle Scholar
  80. Patón D, Azocar P, Tovar J (1998) Growth and productivity in forage biomass in relation to the age assessed by dendrochronology in the evergreen shrub Cistus ladanifer (L.) using different regression models. J Arid Environ 38:221–235CrossRefGoogle Scholar
  81. Peña-Valdivia CB, Sánchez-Urdaneta AB, Meza Rangel J, Juárez Muñoz J, García-Nava R, Celis Velázquez R (2010) Anatomical root variations in response to water deficit: wild and domesticated common bean (Phaseolus vulgaris L.). Biol Res 43:417–427PubMedGoogle Scholar
  82. Phillips WS (1963) Depth of roots in soil. Ecology 44:424CrossRefGoogle Scholar
  83. Pugnaire FI, Luque MT, Armas C, Gutierrez L (2006) Colonization processes in semi-arid Mediterranean old-fields. J Arid Environ 65:591–603CrossRefGoogle Scholar
  84. Raven JA (1977) The evolution of vascular land plants in relation to supracellular transport processes. Adv Bot Res 5:153–219CrossRefGoogle Scholar
  85. Reader RJ, Jalili A, Grime JP, Spencer RE, Matthews NN (1993) A comparative-study of plasticity in seedling rooting depth in drying soil. J Ecol 81:543–550CrossRefGoogle Scholar
  86. Ren H, Long Y, Nan L (2008) Nurse plant theory and its application in ecological restoration in lower-subtropics of China. Prog Nat Sci 18(2):137–142CrossRefGoogle Scholar
  87. Rhizopoulou S, Mitrakos K (1990) Water relations of evergreen sclerophylls. Seasonal changes in water relations of eleven species from the same environment. Ann Bot-London 65:171–178Google Scholar
  88. Riederer M, Schreiber L (2001) Effects of environmental factors on the water permeability of plant cuticles. J Exp Bot 52:2023–2033PubMedCrossRefGoogle Scholar
  89. Robards AWV, Clarkson DT, Sanderson J (1979) Structure and permeability of the epidermal/hypodermal layers of the sand sedge (Carex arenzaria L.). Protoplasma 101:331–347CrossRefGoogle Scholar
  90. Rozema J, Staaij J, Bjiorn LO, Caldwell M (1997) UV-B as an environmental factor in plant life: stress and regulation. Trends Ecol Evol 12(1):22–28PubMedCrossRefGoogle Scholar
  91. Rundel PW (1991) Shrub life forms. In: Chu E, Mooney HA, Winner WE, Pell EJ (eds) Responses of plants to multiple stresses. Academic, New York, pp 345–370Google Scholar
  92. Salleo S, Nardini A (2000) Sclerophylly: evolutionary advantage or mere epiphenomenon? Plant Biosyst 134:247–259CrossRefGoogle Scholar
  93. Sánchez-Gómez D, Zavala MA, Valladares F (2006) Survival responses to irradiance are differentially influenced by drought in seedlings of forest tree species of the temperate-Mediterranean transition zone. Acta Oecol 30:322–332CrossRefGoogle Scholar
  94. Schönherr J, Ziegler H (1980) Water permeability of Betula periderm. Planta 147:345–354CrossRefGoogle Scholar
  95. Schulman E (1938) Classification of false annual rings in Monterey pine. Tree-ring Bull 4:4–7Google Scholar
  96. Schulze ED, Beck E, Müller-Hohenstein K (2005) Plant ecology. Springer, BerlinGoogle Scholar
  97. Schupp EW (1995) Seed seedling conflicts, habitat choice, and patterns of plant recruitment. Am J Bot 82:399–409CrossRefGoogle Scholar
  98. Schwartz MD (1999) Advancing to full bloom: planning phenological research for the twenty first century. Int J Biometeorol 42:113–118CrossRefGoogle Scholar
  99. Shao HB, Chu LY, Jaleel CA, Zhao CX (2008) Water-deficit stress-induced anatomical changes in higher plants. C R Biologies 33:215–225CrossRefGoogle Scholar
  100. Sharp RE, Poroyko V, Hejlek LG, Spollen WG, Springer GK, Bohnert HJ, Nguyen HT (2004) Root growth maintenance during water deficits: physiology to functional genomic. J Exp Bot 55:2343–2351PubMedCrossRefGoogle Scholar
  101. Shields LM (1950) Leaf xeromorphy as related to physiological and structural influences. Bot Rev 16:399–447CrossRefGoogle Scholar
  102. Smith TM, Shugart HH, Woodward FI (eds) (1997) Plant functional types. Cambridge University Press, CambridgeGoogle Scholar
  103. Sperry JS (2000) Hydraulic constraints on plant gas exchange. Agric For Meterology 104(1):13–23CrossRefGoogle Scholar
  104. Sperry JS (2003) Evolution of water transport and xylem structure. Int J Plant Sci 164:S115–S127CrossRefGoogle Scholar
  105. Sperry JS, Hacke UG, Pittermann J (2006) Size and function in conifer tracheids and angiosperm vessels. Am J Bot 93:1490–1500PubMedCrossRefGoogle Scholar
  106. Steudle E (2000) Water uptake by roots: effects of water deficit. J Exp Bot 51:1531–1542PubMedCrossRefGoogle Scholar
  107. Striker GGP, Insausti P, Grimoldi AA, Vega AS (2007) Trade-off between root porosity and mechanical strength in species with different types of aerenchyma. Plant, Cell Environ 30:580–589CrossRefGoogle Scholar
  108. Tattini M, Gravano E, Pinelli P, Mulinacci N, Romani A (2000) Flavonoids accumulate in leaves and glandular trichomes of Phillyrea latifolia exposed to excess solar radiation. New Phytol 148:69–77CrossRefGoogle Scholar
  109. Tosens T, Niinemets U, Vislap V, Eichelmann H, Castro Díez P (2012) Developmental changes in mesophyll diffusion conductance and photosynthetic capacity under different light and water availabilities in Populul tremula: how structure constrains function. Plant Cell Environ 35:839–856PubMedCrossRefGoogle Scholar
  110. Traveset A, Riera N, Mas RE (2001) Ecology of fruit-colour polymorphism in Myrtus communis and differential effects of birds and mammals on seed germination and seedling growth. Funct Ecol 89:749–760Google Scholar
  111. Trubat R, Cortina J, Vilagrosa A (2006) Plant morphology and root hydraulics are altered by nutrient deficiency in Pistacia lentiscus (L.) Trees-Struct Funct 20:334–339Google Scholar
  112. Tyree MT, Sperry JS (1989) Vulnerability of xylem to cavitation and embolism. Annu Rev Plant Phys 40:19–38CrossRefGoogle Scholar
  113. Tyree MT, Davis SD, Cochard H (1994) Biophysical perspectives of xylem evolution: is there a tradeoff of hydraulic efficiency for vulnerability to dysfunction? IAWA J 15(4):335–360Google Scholar
  114. Van den Oever L, Baas P, Zandee M (1981) Comparative wood anatomy of symplocos and latitude and altitude of provenance. IAWA Bull n s 2:3–24Google Scholar
  115. Wheeler EA, Baas P (1991) A survey of the fossil record for dicotyledonous wood and its significance for evolutionary and ecological wood anatomy. IAWA J 12:275–332Google Scholar
  116. Wheeler JK, Sperry JS, Hacke UG, HOANG N (2005) Intervessel pitting and cavitation in woody Rosaceae and other vesselled plants: a basis for a safety versus efficiency trade-off in xylem transport. Plant Cell Environ 28:800–812CrossRefGoogle Scholar
  117. Wilson BF (1995) Shrub stems: form and function. In: Gartner BL (ed) Plant stems: physiology and functional morphology. Academic, San Diego, pp 91–102Google Scholar
  118. Xu Z, Zhou G (2008) Responses of leaf stomatal density to water status and its relationship with photosynthesis in a grass. J Exp Bot 59:3317–3325PubMedCrossRefGoogle Scholar
  119. Young JA, Martens E (1991) Importance of hypocotyl hairs in germination of Artemisia seeds. J. Range Manage 44:438–442CrossRefGoogle Scholar
  120. Zhu J, Brown KM, Lynch JP (2010) Root cortical aerenchyma improves the drought tolerance of maize (Zea mays L.). Plant Cell Environ 33:740–749PubMedGoogle Scholar
  121. Zimmermann MH (1983) Xylem structure and the ascent of sap. Springer, BerlinGoogle Scholar

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Authors and Affiliations

  1. 1.Faculty of Agriculture, Department of Arboriculture, Botany and Plant PathologyUniversity of Naples Federico IIPortici (Naples)Italy

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