Author(s):

S Ranjith Raja Ram, R Anju and KR Saravanan

Abstract: An investigation in rice was undertaken to study the nature and magnitude of heterosis for yield and yield component traits involving seven lines and four testers and twenty eight hybrids were developed through line x tester mating design. Observations were recorded for ten characters <em>viz.,</em> days to 50 per cent flowering, plant height at maturity, number of productive tillers per plant, panicle length, number of grains per panicle, 100 grain weight, grain yield per plant, kernel length, kernel breadth and kernel L/B ratio. Significant heterosis for grain yield and yield component traits were observed in most of the hybrids. Four hybrids exhibited positive and significant heterosis over standard check for grain yield per plant. Standard heterosis and heterobeltiosis for grain yield ranged from -43.20 to 13.64% and -27.40 to 35.79% respectively. A total of three hybrids <em>viz</em>., MTU 1001 X CO 51, IR 72 X TPS 5 and IR 72 X CO 51 were recorded higher grain yield over standard check and were identified as best hybrids for exploiting hybrid vigor. Most of the heterotic crosses for grain yield per plant were accompanied by heterosis for two or more component traits

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