Vol. 9, Issue 10 (2020)

Author(s):
AG Singh and PB Patel

Abstract:
The experiment was carried out during summer and kharif 2018-19 at Main Rice Research Centre, Navsari Agricultural University, Navsari. Six diversified elite lines of rice (IET-24772, IET-24783, GNR-2, GNR-3, GR-11 and GR-15) were used to study heterosis and inbreeding depression for grain yield and its components in three crosses of rice. Heterosis of hybrids over mid parent and better parent varied from cross to cross and character to character. Out of three hybrids studied, only cross-II exhibited significantly positive relative heterosis and heterobeltiosis for grain yield per plant under present study. The highest relative heterosis of 25.08 % and heterobeltiosis of 24.48 % were exhibited by cross GNR-2 x GNR-3. This cross also showed significantly positive relative heterosis for the important yield contributing components i.e., productive tillers per plant while significantly negative relative heterosis was observed for 100 grain weight.