Vol. 10, Issue 5 (2021)

Author(s):
Bineetkaur S Singh and Vipul P Patel

Abstract:
A field experiment was conducted during Kharif-2017 and Kharif-2018 involving six elite lines of rice, six F₁ hybrids and their corresponding F₂ populations to study the inbreeding depression and heterosis for grain yield, yield contributing traits. Relative heterosis and/or heterobeltiosis in desired direction were observed for productive tillers per plant, panicle length, number of grains per panicle, 100 seed weight, grain length, grain yield per plant and straw yield per plant. Heterosis breeding would be more practical approach for improvement of these traits. Therefore, the present study was carried out with an objective to estimate extent of heterosis and inbreeding depression for yield and grain characters. Out of six hybrids studied five hybrids exhibited positive and significant heterosis for grain yield per plant. The findings of present study indicated that majority of the hybrids recorded high heterosis for grain yield. Among the various hybrids exhibiting desirable value of heterosis, Purna x NVSR-2227, Purna x IR-28, GR-5 x GNR-6, GR-5 x GR-7and GR-7 x Purna were top performers for grain yield per plant.