Heterosis for Yield and Yield Components in CMS based Hybrids in Rice (Oryza sativa L.)

摘要

Forty eight hybrids developed from crossing four CMS lines and twelve testers were evaluated for the extent of heterosis over mid parent, better parent and standard parent for yield and yield components in rice during rabi 2010. Seven crosses out of 48 exhibited highly significant standard heterosis for grain yield plant1. Heterosis for grain yield was manifested due to the significant and positive heterosis for its components viz., total number of productive tillers per plant, number of grains per panicle, 200-kernel test weight and harvest index. The top four heterotic combinations identified for grain yield plant were APMS 6A x MTU 1078, IR 58025Ax MTU 5249, APMS 6Ax MTU 7029 and IR 58025Ax MTU 1078 which exhibited more than 20% standard heterosis.