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Journal of Experimental Botany, Vol. 52, No. 354, pp. 85-90, January 2001
© 2001 Oxford University Press

Original Papers

Rapid deposition of wheat cell wall structural proteins in response to Fusarium-derived elicitors

W. El-Gendy1,2, M.D. Brownleader1, H. Ismail2, P.J. Clarke1,3, J. Gilbert3, F. El-Bordiny4, M. Trevan1, J. Hopkins1, M. Naldrett5 and P. Jackson6,7

1 University of Westminster, School of Biosciences, 115 New Cavendish St., London W1M 8JS, UK
2 Department of Nutrition, High Institute of Public Health, University of Alexandria, 165 El-Horye Avenue, El-Hadrah, Alexandria, Egypt
3 Agriculture and Agri-Food, Cereal Research Centre, 195 Dafoe Rd., Winnipeg, Manitoba R3T 2M9, Canada
4 Milling, 19 Elsawah Square, Alameria, Cairo, Egypt
5 John Innes Centre, Protein Sequencing and Peptide Synthesis Facility, Norwich Research Park, Colney, Norwich NR4 7UH, UK
6 Instituto de Tecnologia Química e Biológica, Apartado 127, Oeiras 2781-901, Portugal

Two novel cell wall structural proteins of spring wheat (Triticum aestivum L. em Thell.). undergo rapid deposition in the cell wall matrix in a H2O2-dependent reaction after the elicitation of cultures with Fusarium graminearum (L.)-derived elicitor. The amino acid compositions of these proteins were remarkably similar and indicated that they were highly acidic (pI 3.8). These proteins contained 13–17% each of Gly, Glx and Ser with lesser amounts (6–8%) of Ala, Asx and Thr, and it has been suggested that they are known as glycine- and serine-rich proteins (GSRPs). SELDI-MS ionization spectra demonstrated that these proteins have low molecular masses of 8590 and 4292 Da. These results are discussed in relation to the possible role of these novel proteins in rapid, cell wall defensive reactions to pathogenic attack.

Key words: Structural proteins, elicitation, cell wall, Triticum aestivum L.


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