Genetic variability studies for gall midge incidence, yield and its components in rice (Oryza sativa L.) genotypes in Northern Telangana

Abstract

The field experiment was conducted at Agricultural Research Station, Kunaram during the rainy season of 2017 to investigate genetic variability for gall midge incidence, yield and its components among thirty two genotypes. Considerable amount of genetic variability was observed among all the genotypes for all the traits under study. In general, phenotypic coefficients of variation (PCV) estimates were higher than genotypic coefficients of variation (GCV) estimates for all the studied characters. The GCV and PCV were high for gall midge incidence, number of grains per panicle, 1000-grain weight and grain yield. Additive gene action was predominant for gall midge incidence, number of grains per panicle, 1000-grain weight, grain yield, days to 50% flowering and plant height. Hence, combined results of coefficients of variation and heritability studies revealed that gall midge incidence, number of grains per panicle, 1000-grain weight and grain yield could be given due importance among the traits studied for further crop improvement.