Estimation of heterosis for seed yield and yield attributing traits in rice (Oryza sativa) under salinity condition

Realizing the potential of hybrid rice to increase productivity, the present experiment was undertaken with a fixed model i.e. line x tester mating design involving 3 tester (male) and 18 line (female) to identify the best heterotic combinations. The results indicated that the heterobiltiosis for grain yield was significantly superior for 2 hybrids ranging from -59.40 to 27.12%. Standard heterosis ranged from -52.52 to 48.64% and 16 hybrids showed significantly and positive standard heterosis over Narendra User Dhan 2009. Cross, NDRK 50001 × Narendra Usar Dhan 2009 exhibited heterobiltiosis for grain yield per plant, also showed significant heterobiltiosis for plant height, biological yield per plant and 1000 grain weight. This hybrid also recorded high standard heterosis for grain yield per plant along with significant standard heterosis for panicle bearing tillers per plant, spikeltes per panicle, grains per panicle, kernel length, biological yield per plant, 1000 grain weight and L: B Ratio. Cross NDRK 5035 × Narendra Usar Dhan 3 also exhibited significant heterobiltiosis and standard heterosis for grain yield per plant along with other quantitative traits.