Premium
Specific resistances against Pseudomonas syringae effectors AvrB and AvrRpm1 have evolved differently in common bean ( Phaseolus vulgaris ), soybean ( Glycine max ), and Arabidopsis thaliana
Author(s) -
Chen Nicolas W. G.,
Sévignac Mireille,
Thareau Vincent,
Magdelenat Ghislaine,
David Perrine,
Ashfield Tom,
Innes Roger W.,
Geffroy Valérie
Publication year - 2010
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1111/j.1469-8137.2010.03337.x
Subject(s) - pseudomonas syringae , biology , phaseolus , arabidopsis , arabidopsis thaliana , effector , genetics , botany , gene , population , synteny , genome , mutant , microbiology and biotechnology , demography , sociology
Summary• In plants, the evolution of specific resistance is poorly understood. Pseudomonas syringae effectors AvrB and AvrRpm1 are recognized by phylogenetically distinct resistance ( R ) proteins in Arabidopsis thaliana (Brassicaceae) and soybean ( Glycine max , Fabaceae). In soybean, these resistances are encoded by two tightly linked R genes, Rpg1‐b and Rpg1‐r . To study the evolution of these specific resistances, we investigated AvrB‐ and AvrRpm1‐induced responses in common bean ( Phaseolus vulgaris , Fabaceae). • Common bean genotypes of various geographical origins were inoculated with P. syringae strains expressing AvrB or AvrRpm1. A common bean recombinant inbred line (RIL) population was used to map R genes to AvrRpm1. • No common bean genotypes recognized AvrB. By contrast, multiple genotypes responded to AvrRpm1, and two independent R genes conferring AvrRpm1‐specific resistance were mapped to the ends of linkage group B11 ( Rpsar‐1 , for r esistance to P seudomonas s yringae effector A vr R pm1 number 1 ) and B8 ( Rpsar‐2 ). Rpsar‐1 is located in a region syntenic with the soybean Rpg1 cluster. However, mapping of specific Rpg1 homologous genes suggests that AvrRpm1 recognition evolved independently in common bean and soybean. • The conservation of the genomic position of AvrRpm1‐specific genes between soybean and common bean suggests a model whereby specific clusters of R genes are predisposed to evolve recognition of the same effector molecules.