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R gene expression induced by a type-III effector triggers disease resistance in rice
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R gene expression induced by a type-III effector triggers disease resistance in rice
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R gene expression induced by a type-III effector triggers disease resistance in rice
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Journal Article
R gene expression induced by a type-III effector triggers disease resistance in rice
2005
Overview
Disease resistance (R) genes in plants encode products that specifically recognise incompatible pathogens and trigger a cascade of events leading to disease resistance in the host plant. R-gene specificity is dictated by both host R genes and cognate avirulence (avr) genes in pathogens. However, the basis of gene-for-gene specificity is not well understood. Here, we report the cloning of the R gene Xa27 from rice and the cognate avr gene avrXa27 from Xanthomonas oryzae pv. oryzae. Resistant and susceptible alleles of Xa27 encode identical proteins. However, expression of only the resistant allele occurs when a rice plant is challenged by bacteria harbouring avrXa27, whose product is a nuclear localized type-III effector. Induction of Xa27 occurs only in the immediate vicinity of infected tissue, whereas ectopic expression of Xa27 resulted in resistance to otherwise compatible strains of the pathogen. Thus Xa27 specificity towards incompatible pathogens involves the differential expression of the R gene in the presence of the AvrXa27 effector.
Publisher
Nature Publishing Group UK,Nature Publishing,Nature Publishing Group
Subject
Agronomy. Soil science and plant productions
/ Alleles
/ bacterial diseases of plants
/ Biological and medical sciences
/ blight
/ Cloning
/ Disease
/ Fundamental and applied biological sciences. Psychology
/ Gene Expression Regulation, Plant - genetics
/ Genes
/ Genetics and breeding of economic plants
/ Humanities and Social Sciences
/ letter
/ Pathology. Damages, economic importance
/ Phytopathology. Animal pests. Plant and forest protection
/ Plant Diseases - microbiology
/ R gene
/ Rice
/ Science
/ Varietal selection. Specialized plant breeding, plant breeding aims
