Heterosis studies on yield components in hybrid rice (Oryza sativa. L)

Abstract

Thirty-two hybrids developed from crossing four CMS lines and eight testers were evaluated for relative heterosis, heterobeltiosis and standard checks for yield traits in rice (Oryza sativa L.) during kharif 2019. The results indicated that heterobeltiosis for grain yield was significantly positive and superior over eleven hybrids ranging from -52.94 (CMS 64A X JGL 34985) to 149.24% (JMS 19A X JGL 34985) and ten hybrids over check (PA 6444) ranging from -47.76 (CMS 64A X JGL 34985) to 67.35% (JMS 19A X JGL 34985). Most of the crosses exhibiting superiority over better parent or standard check for grain yield showed significant heterosis for spikelet fertility and 1000 grain weight. The top hybrids JMS 19A X JGL 34985, CMS 14A X NSR 61 and CMS 64A X JGL 34984 exhibiting significant positive heterosis for yield over standard hybrid (PA 6444) were can be further exploited commercially.