Abstract
The expression of extA, an extensin gene from Brassica napus L. (oilseed rape) was examined in transgenic Nicotiana tabacum L. (tobacco) and untransformed Brassica juncea L. and B. napus tissues. Northern analysis showed that this gene maintained its normal pattern of expression when transferred to tobacco. In transgenic tobacco plants containing an extA promoter/β-glucuronidase coding sequence fusion, expression of extA was detected in the external and internal phloem of the main stem. High expression levels were seen in cortical parenchyma cells at the point where the axillary flowering branch joined the main stem. Expression was greatest in regions where the maximum tensile stress would seem to be exerted on the main stem by the weight of the axillary branch. It was confirmed that this expression pattern was due to tensile stress by using weights to induce expression of the fusion gene in axillary flowering stalks. In B. juncea pods, in-situ hybridisation studies showed that the extensin gene was strongly expressed in cells of the carpel walls within which considerable tensile stresses develop.
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Abbreviations
- GUS:
-
β-glucuronidase
- X-GLUC:
-
5-bromo-4-chloro-3-indolyl glucuronide
- SSC:
-
saline sodium citrate
References
Bevan MW (1984) Agrobacterium vectors for plant transformation. Nucleic Acids Res 12: 8711–8721
Carpita NC, Gibeaut DM (1993) Structural models of primary cell walls in flowering plants: consistency of molecular structure with the physical properties of the walls during growth. Plant J 3: 1–30
Cassab GI, Varner JE (1987) Immunocytolocalisation of extensin in developing soybean seed coats by immunogold silver staining and by tissue printing on nitrocellulose paper. J Cell Biol 105: 2581–2588
Cassab GI, Varner JE (1988) Cell wall proteins. Annu Rev Plant Physiol Plant Mol Biol 39: 321–353
Chen J, Varner JE (1985) An extracellular matrix protein in plants: characterisation of a genomic clone for carrot extensin. EMBO J 4: 2145–2151
Ellis JR, Shirsat AH, Hepher A, Yarwood JN, Boulter D, Croy RRD (1988) Tissue specific expression of a pea legumin gene in seeds of N. plumbaginifolia. Plant Mol Biol 10: 203–214
Evans IM, Gatehouse LN, Gatehouse JA, Yarwood JN, Boulter D, Croy RRD (1990) The extensin gene family in oilseed rape (Brassica napus L.): characterisation of sequences of representative members of the family. Mol Gen Genet 223: 273–287
Feinberg AP, Vogelstein BC (1983) A technique for radiolabelling DNA restriction endonuclease fragments to high specific activity. Anal Biochem 132: 6–13
Fourney RM, Miyakoshi J, Day RS, Paterson MC (1988) Northern blotting — efficient RNA staining and transfer. Focus 10, No.l. BRL, Gaithersburg, Maryland
Graham DE (1978) The isolation of high molecular weight DNA from whole organisms or large tissue masses. Anal Biochem 85: 609–613
Jefferson RA (1987) Assaying chimaeric genes in plants; the GUS gene fusion system. Plant Mol Biol Rep 5: 387–405
José M, Puigdomenech P (1993) Structure and expression of genes coding for structural proteins of the plant cell wall. New Phytol 125: 259–282
Keller B, Schmid J, Lamb CJ (1989) Vascular expression of a bean cell wall glycine rich protein β-glucuronidase gene fusion in transgenic tobacco. EMBO J 6: 3901–3907
Kieliszewski, MJ, Lamport DTA (1994) Extensin: repetitive motifs, functional sites, post-translational codes, and phylogeny. Plant J 5(2): 157–172
Lamport DTA (1967) Hydroxyproline-O-glycosidic linkage of the plant cell wall glycoprotein extensin. Nature 216: 1322–1324
Logemann J, Schell J, Willmitzer L (1987) Improved method for the isolation of RNA from plant tissues. Anal Biochem 163: 16–20
McFadden GI (1994) In-situ hybridisation of RNA. In: Harris N, Oparka KJ: Plant cell biology: a practical approach. IRL Press at Oxford University Press, Oxford, pp 97–125
McQueen-Mason SJ, Durachko DM, Cosgrove DJ (1992) Two endogenous proteins that induce cell wall extension in plants. Plant Cell 4: 1425–1433
Neibel A, de Almeida Engler J, Tiré C, Engler G, van Montagu M, Gheysen G (1993) Induction patterns of an extensin gene in tobacco upon nematode infection. Plant Cell 5: 1697–1710
Sambrook J, Fritsch EF, Maniatis T (1989) Molecular cloning. A laboratory manual, 2nd edn. Cold Spring Harbor Press, New York, USA
Shirsat AH, Wilford N, Evans IM, Gatehouse LN, Croy RRD (1991) Expression of a Brassica napus extensin gene in the vascular system of transgenic tobacco and rape plants. Plant Mol Biol 17: 701–709
Showalter AM (1993) Structure and function of plant cell wall proteins. Plant Cell 5: 9–23
Smith RC, Fry SC (1991) Endotransglycosylation of xyloglucans in plant cell suspension cultures. Biochem J 279: 529–535
Spence J, Vercher Y, Gates P, Harris, N (1995) ‘Pod shatter’ in Arabidopsis thaliana, Brassica napus and B. juncea. J Microsc, in press
Steifel V, Ruiz-Avila L, Raz R, Valles MP, Gomez J, Pages M, Martinez-Izquierdo JA, Ludevid MD, Langdale JA, Nelson T, Puigdomenech P (1990) Expression of a maize cell wall hydroxyproline-rich glycoprotein gene in early leaf and root vascular differentiation. Plant Cell 2: 785–793
Tiré C, De Rycke R, De Loose M, Inzé D, Van Montagu M, Engler G (1994) Extensin gene expression is induced by mechanical stimuli leading to local cell wall strengthening in Nicotiana plumbaginifolia. Planta 195: 175–181
Ye Z-H, Varner JE (1991) Tissue specific expression of cell wall proteins in developing soybean tissues. Plant Cell 3: 23–37
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We thank the Biotechnology and Biological Sciences Research Council for funding this research, and Mrs. W. Grail for her expertise in histochemical technique. Ms. J. Spence is the recipient of a Biotechnology and Biological Sciences Research Council post-graduate studentship award.
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Shirsat, A.H., Bell, A., Spence, J. et al. The Brassica napus extA extensin gene is expressed in regions of the plant subject to tensile stresses. Planta 199, 618–624 (1996). https://doi.org/10.1007/BF00195195
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DOI: https://doi.org/10.1007/BF00195195