Stability analysis for grain yield and yield components of rice (Oryza sativa L.) in low lands of hill zone of Karnataka.

摘要

A study was conducted to assess 18 elite rice genotypes in lowlands for their yield stability at three different locations (Mudigere, Ponnampet and Sirsi, Karnataka, India) during the kharif season of 2001. The mean sum of squares due to genotype (G) and environment (E) differences tested against the G x E interaction were significant for all the traits studied. Both linear and nonlinear components were significant for days to 50% flowering, plant height and panicle number. The deviation from regression for grain yield were significant in genotypes Intan, IET-14080, Sharavathi, IET-10472, IET-14320 and KHRS-22, IET-16695, KHRS-21 and KHRS-28 showed unit regression and non-significant deviation from regression. The deviation from regression for days to 50% flowering was significant for genotypes Intan, IET-15656, IET-14080, Sharavathi, IET-13736 and IET-9926. However, Hemavathi and IET-16695 showed unit regression and less deviation from regression. For panicle number, all the genotypes showed non-significant regression. However, a unit regression was observed for genotypes Padma and IET-14320. Based on individual stability parameters, genotypes KHRS-21, KHRS-22, KHRS-28 exhibited higher grain yield over the population mean, with regression coefficient near unity and negligible deviation from regression, indicating their average stability. Genotypes KHRS-21, KHRS-22 and KHRS-28 were ideally adaptable and stable. They could be recommended for cultivation in this hill zone of Karnataka..