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Article Abstract
Unlabelled: Bacterial blight, one of the oldest and most severe diseases of rice poses a major threat to global rice production and food security. Thereafter, sustainable management of this disease has given paramount importance globally. In the current study, we explored 792 landraces to evaluate their disease reaction status against three highly virulent strains (, and ) of pv (). Subsequently, we intended to identify the possible candidate resistant () genes responsible for the resistant reaction using six STS (Sequence Tagged Site) markers correspond to , , , , and genes and finally, we evaluated morphological variability of the potential bacterial blight resistant germplasm using quantitative traits. Based on pathogenicity test, a single germplasm was found as highly resistant while, 33 germplasm were resistant and 40 were moderately resistant. Further molecular study on these 74 germplasm divulged that 41 germplasm carried gene, 15 carried gene, 62 carried gene, 33 carried gene, and 19 carried gene. Only a single germplasm found to carry gene. Interestingly, we found a wide range of gene combinations ranged from 2 to 4 genes among the germplasm, where 10 germplasm carried 4 genes, 15 germplasm carried 3 genes and 38 germplasm carried 2 genes of various combinations. Notably, G3 genotype (Acc. No. 4216; highly resistant) having , , , and G43 genotype (Acc.No. 1523; resistant) having , , and gene combination being the most effective against all the strains. Nonetheless, UPGMA dendrogram and heatmap analysis based on quantitative traits identified two clusters viz. cluster-III and cluster-VIII with multiple desired traits. The outcome of this study would enrich and diversify the rice gene pool and would be useful for the development of durable bacterial blight resistant varieties.
Supplementary Information: The online version contains supplementary material available at 10.1007/s12298-022-01139-x.
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| http://dx.doi.org/10.1007/s12298-022-01139-x | DOI Listing |
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