Genetic parameters studies on bacterial blight resistance genes introgressed segregating population in Rice

An exploratory research was conducted to know genetic parameters and agronomical performance of three bacterial blight resistance genes introgressed segregating population of CB 174 R × IRBB 60, CB 87 R × IRBB 60 and TNAU CMS 2B × IRBB 60 in rice. Higher range of genotypic and phenotypic coefficient of variation (GCV and PCV) was found in CB 87 R × IRBB 60 for the trait of number of grains and leads to develop/selection superior genotypes significantly. For single plant yield, CB 174 R × IRBB 60 cross showed high heritability (83.89%) and (27.45%) genetic advance (%) suggesting that traits were primarily controlled by additive gene action and thus, leads to easy selection. Whereas, estimate of moderate heritability (56.09%) with high genetic advance (24.66%) was found in the cross of CB 87 R × IRBB 60 indicating that postponement of selection and for the cross of TNAU CMS 2B × IRBB 60 showed higher heritability with moderate level of genetic advance (67.36% and 11.84%), revealed that single plant yield was preponderantly governed by both additive and non-additive gene effects and selection may be rewarded.