Author(s):

SK Yasin Baksh, Elsa Pandit, Lambodar Behera and Sushanta Kumar Dash

Abstract: Bacterial leaf blight (BLB) is one of the most devastating diseases in rice accounting for a considerable yield loss globally, posing an untamable threat to food security in near future. To tackle this issue, breeding efforts need to be focused around development of durable rice cultivars that are high yielding as well as pest resilient. The present study was conducted to investigate the potential of 21 rice genotypes including resistant and susceptible checks, against Bacterial leaf blight (BLB) at both genotypic and phenotypic level. BLB resistance genes (Xa4, xa5 and xa13), linked markers were employed to determine the allelic status amongst the genotypes. The results showed the frequency of Xa4 resistant allele (78.95%) and xa5 alleles (15.79%) in the test rice genotypes but xa13 resistant allele (00.00%) were not detectable in any of them. At phenotypic level, based on disease severity data, except for the resistant check (IRRBB56) none of the test genotypes were recorded resistant against Xoo, although 2 of the genotypes showed moderate resistance due to the presence of two BLB resistant alleles in their genetic background as reflected in their genotypic screening, justifying the fact that a combination of two or more BLB resistant gene is effective against the evolving Xoo races. The results of the study could serve as useful information to the breeders for developing BLB resistant cultivars.

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