Vegetos

Abstract

The 23 F₄:F₅ lines of rice derived from the cross HUR 105 and IRBB 55 against bacterial leaf blight (BLB) at phenotypic and genetic levels were evaluated during Kharif 2015. The validation for the BLB resistance genes Xa21 and xa13 by the static markers pTA-248 and xa13pro conferring that these two genes were present in all the 23 F₄:F₅ rice lines. The highest value of heritability was obtained for plant height (89%) followed by number of effective tillers per plant (77.48%), test weight (74.81%) and grain yield per plant (73.66%). Positive and significant association were recorded between grain yield per plant with plant height, panicle weight, number of effective tillers, filled grains per panicle and total grains per panicle. Path analysis revealed direct and positive effect on grain yield per plant through traits like plant height, panicle weight, number of tillers, filled grains per panicle and total grains per panicle. Highest genetic advance was observed for total grains per panicle (31.87) followed by filled grains per panicle (22.84) and plant height (8.11). High heritability and high genetic advance may be attributed to additive gene action and simple selection could be applied for genetic improvement.