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Diversity And Molecular Evolution Of The Rps2 Resistance Gene In Arabidopsis Thaliana, Ana Lucia Caicedo
Diversity And Molecular Evolution Of The Rps2 Resistance Gene In Arabidopsis Thaliana, Ana Lucia Caicedo
Ana Lucia Caicedo
The RPS2 gene in Arabidopsis thaliana governs resistance to strains of the bacterial pathogen, Pseudomonas syringae pv. tomato, that express the avrRpt2 gene. The two loci are involved in a gene-for-gene interaction. Seventeen accessions of A. thaliana were sequenced to explore the diversity present in the coding region of the RPS2 locus. An unusually high level of nucleotide polymorphisms was found (1.26%), with nearly half of the observed polymorphisms resulting in amino acid changes in the RPS2 protein. Seven haplotypes (alleles) were identified and their evolutionary relationships deduced. Several of the alleles conferring resistance were found to be closely related, …