Year: 2017 | Month: February | volume 10 | Issue 1
Heterosis studies for yield & yield traits in rice (Oryza Sativa L.) under rainfed condition
Abstract:
Recognising the potential of hybrid rice to increase the productivity, the present investigation was conducted using three WA CMS lines (Pusa 6A, IR79156A and IR 68897A) and 31 male genotypes. The results manifested that the magnitude of heterosis for grain yield over better parent was significantly superior in eight hybrids with highest value of 60.83% in Pusa 6A x HUR-105. Sixteen hybrids showed significant positive heterosis over standard variety (NDR-97) with highest value of 116.48% in Pusa 6A x HUR-105. Twelve hybrids showed significant positive heterosis over standard hybrid (Arize-6444) with highest value of 85.69% in Pusa 6A x HUR-105. The top two high yielding heterotic crosses over the standard variety (NDR-97) were Pusa-6A x HUR-105 (116.48%) and Pusa-6A x Pantdhan-12 (114.74%). These two hybrids also exhibited significant positive heterosis for yield over standard hybrid (Arize 6444 Gold) i.e. 85.69% and 84.19% respectively. Hybrids Pusa-6A x HUR-105 and Pusa-6A x Pantdhan-12 showed significant positive standard heterosis for almost all the desirable yield attributing traits, apart from this Pusa-6A x Pantdhan-12 also showed significant negative standard heterosis over SH (Arize-6444) for days to 1st flowering, days to 50% flowering and days to maturity. The top heterotic crosses viz., Pusa-6A x HUR-105, Pusa-6A x Pantdhan-12, Pusa-6A x URG-30, IR-79156A x Akshaydhan and Pusa-6A x NDR-359 and others which expressed higher standard heterosis for grain yield along with other desirable yield components should be tested in large scale under rainfed condition.
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