Abstract
The deduced protein sequences of microbial avirulence genes have not illuminated their functions in the pathogens that harbor them. Indeed, the only well characterized avirulence genes with defined functions are the coat protein genes of viral pathogens [1,2]. In the case of these genes, the coat protein itself appears to function as an elicitor recognized by resistant plant cells. Certain cloned fungal avirulence genes also direct production by the pathogen of specific elicitors [3, 4,5]. In bacterial pathogens, only one avirulence gene, avrD,has thus far been shown to direct elicitor production [6]. These elicitors initiate active hypersensitive defense reactions (HR) only in plants carrying the complementary disease resistance genes. It has long been proposed that plant disease resistance genes encode specific receptors, probably located on the plant plasma membrane [7,8] and recent work on the cloning of disease resistance genes supports this idea [9, B. Staskawicz, personal communication]. Such receptors are thought to perceive elicitors and generate intracellular signal cascades that eventually derepress expression of defense response genes. These gene products, in turn, actually restrict pathogen development.
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© 1994 Springer Science+Business Media Dordrecht
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Keen, N. et al. (1994). Syringolide Elicitors Specified by Avirulence Gene D Alleles in Pseudomonas Syringae . In: Daniels, M.J., Downie, J.A., Osbourn, A.E. (eds) Advances in Molecular Genetics of Plant-Microbe Interactions. Current Plant Science and Biotechnology in Agriculture, vol 21. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-0177-6_7
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DOI: https://doi.org/10.1007/978-94-011-0177-6_7
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