Gene action, combining ability and heterosis in rice genotypes of North Western Himalayas

Abstract

Results of these studies revealed that both additive and non-additive gene actions were involved in the inheritance of all traits. Preponderance of additive gene action was observed in the inheritance of ten traits viz., days to 75% maturity, plant height, spikelets/panicle, grains/panicle, harvest index, grain length, grain breadth, L:B ratio, amylose content and grain yield/plant. Preponderance of non-additive gene action was observed in the inheritance of eight traits viz., days to 50% flowering, maturity period, total tillers/plant, effective tillers/plant, panicle length, spikelet fertility, biological yield/plant and test weight. Genotype HPR 3007 followed by HPR 1156 and Kasturi were identified as superior parents based on high grain yield/plant and general combining ability. HPR 3007 × HPR 2373 followed by HPR 3007 × HPR 2612, Kasturi × HPR 2612 and HPR 3007 × HPR 3010 were identified as promising crosses based on high grain yield/plant, heterosis and specific combining ability. Identified superior parents and crosses can be used as donor parents for the improvement of existing low yielding basmati cultivars.

Gene Action and Genetic Improvement of Parental Lines in Hybrid Rice for Developing New Hybrids

“…Thus GCA estimate could help in identifying the parents which would give crosses and improve parental lines for desirable traits. These results were agreed with those obtained by Awad-Allah 12 , Sari et al 25 , Rasheed et al 27 and Singh et al 23 . Concerning plant height, the three parents G 46 B (-5.9), IR 69625 B (-4. and Sakha 101 (9.1) gave the significant and highly significant positive value of GCA effects.…”

“…Results indicated that general combining ability and specific combining ability were found to be highly significant for all traits under study (except hulling percentage). This indicated the importance of both additive and non-additive genetic variance in determining the inheritance of grain yield, its components and grain quality traits studied, these findings agree with the obtained by Awad-Allah 12 , Yogameenakshi and Vivekanandan 18 , Dwivedi and Pandey 19 , Kumar et al 20 , Ray et al 22 and Singh et al 23 .…”

“…It could be concluded that selection procedures based on the accumulation of additive effect would be successful in improving these traits. The importance of additive genetic variances have been reported by Awad-Allah 12 , Kumar et al 20 , Akanksha and Jaiswal 21 , Singh et al 23 , Cui et al 24 , Sari et al 25 , Vange et al 26 and Rasheed et al 27 . Therefore, the selection procedures based on the accumulation of additive effect would be successful in improving grain yield and agronomic traits, Bano and Singh 10 , Awad-Allah 12 and Singh et al 23 .…”

“…These findings indicated the presence of large variations among them. Also, the results indicated that the mean squares of the parents (except panicle length), parents vs. crosses (except panicle 12,18,[20][21][22][23] .…”

Combining Ability and Heterotic Studies in Aromatic Rice Through Line by Tester Analysis

“…Therefore, late selection of genotypes for future breeding research to improve new aromatic rice genotypes could be beneficial (Ashfaq et al, 2012;Kahani and Hittalmani, 2016). On the other hand, Singh et al (2021) suggested that heterosis breeding is an effective method for improving such characteristics governed by dominant gene action. Abdullah et al (2020) demonstrated that dominant genes influence grain yield and its characteristics.…”