Heterosis for yield and its components traits of rice (Oryza sativa L.) in aerobic condition

A study was conducted to estimate the extent of relative heterosis and heterobeltiosis for various quantitative and qualitative traits using diallel analysis excluding reciprocal crosses in aerobic condition. Among parents, IET-24021, IET-23998 and IET-24025 were found superior for grain yield and most of its yield attributing traits. High magnitude of relative heterosis and heterobeltiosis were observed for grain yield per plant, days to 50 per cent flowering, number of productive tillers per plant, straw yield per plant, grains per panicle, test weight, protein content and amylose content. The cross combination IET-24001 × GNR-3, IET-24001 × IR-28 and IET-24002 × GNR-3 exhibited highly significant heterosis in desired direction for grain yield and its yield attributing traits. The cross combination IET-24001 × GNR-3, IET-24001 × IR-28 and IET-24002 × GNR-3 were identified as the best combinations for aerobic conditions on the basis of high per se performance and high heterobeltiosis.