Gene action and heterosis studies for yield and its components in upland rice

Abstract

The present study was conducted to work out gene action and heterosis studies using Line × Tester mating design in rice using 10 lines suitable for rainfed upland conditions of H.P. and 3 testers in Kharif 2021 and 2022 (for crossing and evaluation, respectively). The per cent narrow sense heritability was low (<50%) for all the traits and among them the highest h²_ns was shown by spikelet fertility (10.09) followed by grain Breadth (10.06) and spikelet per panicle (9.79). This also indicates the preponderance of non- additive genetic variance in the inheritance of these traits.The cross combinations that showed significantly high heterosis over the standard check for grain yield per plant were HPR 2559 x HPR 2795 (91.62%), HPR 2559 x HPR 1156 (72.81%), HPR 2645 x HPR 2656 (65.65%), and HPR 2830 x HPR 1156 (58.82%).