1887

Abstract

The adaptation of rice yellow mottle virus (RYMV) to -mediated resistance has been reported to involve mutations in the viral genome-linked protein (VPg). In this study, we analysed several cases of resistance breakdown by an isolate with low adaptability. Surprisingly, in these rarely occurring resistance-breaking (RB) genotypes, mutations were detected outside the VPg, in the ORF2a/ORF2b overlapping region. The causal role of three mutations associated with resistance breakdown was validated via directed mutagenesis of an infectious clone. In resistant plants, these mutations increased viral accumulation as efficiently as suboptimal RB mutations in the VPg. Interestingly, these mutations are located in a highly conserved, but unfolded, domain. Altogether, our results indicate that under strong genetic constraints, unfit genotypes can follow alternative mutational pathways, i.e. outside the VPg, to overcome resistance.

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2014-01-01
2019-11-19
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