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Xa21D Encodes a Receptor-Like Molecule with a Leucine-Rich Repeat Domain That Determines Race-Specific Recognition and Is Subject to Adaptive Evolution

Guo-Liang Wang, De-Ling Ruan, Wen-Yuan Song, Steve Sideris, LiLi Chen, Li-Ya Pi, Shiping Zhang, Zhen Zhang, Claude Fauquet, Brandon S. Gaut, Maureen C. Whalen and Pamela C. Ronald
The Plant Cell
Vol. 10, No. 5 (May, 1998), pp. 765-779
DOI: 10.2307/3870663
Stable URL: http://www.jstor.org/stable/3870663
Page Count: 15
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Xa21D Encodes a Receptor-Like Molecule with a Leucine-Rich Repeat Domain That Determines Race-Specific Recognition and Is Subject to Adaptive Evolution
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Abstract

The rice Xa21 gene confers resistance to Xanthomonas oryzae pv oryzae in a race-specific manner. Analysis of the inheritance patterns and resistance spectra of transgenic plants carrying six Xa21 gene family members indicated that one member, designated Xa21D, displayed a resistance spectrum identical to that observed for Xa21 but conferred only partial resistance. Xa21D encodes a receptor-like protein carrying leucine-rich repeat (LRR) motifs in the presumed extracellular domain. The Xa21D transcript terminates shortly after the stop codon introduced by the retrotransposon Retrofit. Comparison of nucleotide substitutions in the LRR coding regions of Xa21 and Xa21D provided evidence of adaptive selection. Both functional and evolutionary evidence indicates that the Xa21D LRR domain controls race-specific pathogen recognition.

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