First published online January 23, 2004; 10.1105/tpc.016725
The Plant Cell 16:309-318 (2004)
© 2004 American Society of Plant Biologists
Convergent Evolution of Disease Resistance Gene Specificity in Two Flowering Plant Families
Tom Ashfield,
Laura E. Ong,
Kan Nobuta,
Christopher M. Schneider and
Roger W. Innes1
Department of Biology, Indiana University, Bloomington, Indiana 47405-7107
1 To whom correspondence should be addressed. E-mail rinnes{at}bio.indiana.edu; fax 812-855-6082.
Plant disease resistance (R) genes that mediate recognition of the same pathogen determinant sometimes can be found in distantly related plant families. This observation implies that some R gene alleles may have been conserved throughout the diversification of land plants. To address this question, we have compared R genes from Glycine max (soybean), Rpg1-b, and Arabidopsis thaliana, RPM1, that mediate recognition of the same type III effector protein from Pseudomonas syringae, AvrB. RPM1 has been cloned previously, and here, we describe the isolation of Rpg1-b. Although RPM1 and Rpg1-b both belong to the coiled-coil nucleotide binding site (NBS) Leu-rich repeat (LRR) class of R genes, they share only limited sequence similarity outside the conserved domains characteristic of this class. Phylogenetic analyses of A. thaliana and legume NBS-LRR sequences demonstrate that Rpg1-b and RPM1 are not orthologous. We conclude that convergent evolution, rather than the conservation of an ancient specificity, is responsible for the generation of these AvrB-specific genes.
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