Current Science

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Fusarium wilt (Fusarium oxysporum f. sp. niveum) in watermelon is one of the deadliest diseases around the globe, and availability of disease-resistant varieties is moderate. Disease management utilizing resistance genes (R-genes)/resistance gene analogs (RGAs) has proven to be a promising and successful approach. In the present study, six watermelon RGAs were isolated from wild, fusarium wilt resistant genotype IIHR-82 (Citrullus lanatus var. citroides) using degenerate primers that identify nucleotide binding site-leucine-rich repeat (NBS–LRR) regions. Multiple sequence alignment of these RGAs identified the characteristic NBS– LRR motif, and BLASTp search revealed similarity of these RGAs with other pathogenesis-related proteins. Phylogeny and motif analysis revealed genetic diversity of RGAs within those isolated from watermelon and with other plant R-genes. The watermelon RGAs isolated in this study contained both TIR–NBS–LRR (TNL) and non-TIR–NBS–LRR (CNL) classes of Rgenes. Protein secondary structure prediction of these watermelon RGAs revealed the composition of proteins, including α -helix, β -strand, disordered region and other template-related information. Watermelon RGAs identified in the present study will help in the development of RGA-based markers for resistance to fusarium wilt of watermelon.

Keywords

Disease Management, Fusarium Wilt, Resistance Genes, Watermelon.
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