Vol. 11, Issue 9 (2022)

Author(s):
Pratik N Satasiya, Ritesh K Patel, Haimil Joshi, Vipul P Patel, Vipul B Parekh, Kaushal G Modha and Sanyam Patel

Abstract:
The present investigation was carried out to study the nature and magnitude of gene action for yield and its attributes under saline conditions. Three crosses IR-28 × IR 55179-3B-11-3, GR-17 × IR 55179-3B-11-3 and GR-17 × Dandi were obtained by crossing the parents to produce the F_1s and then the F₂, BC₁ and BC₂ generations were generated by selfing and backcrossing the F1s with their respective recurrent parent during rabi 2019-20 and kharif 2020. The experimental material consisting of six generations of each of the three crosses and evaluated during kharif 2020-21 in compact family block design with three replications at Costal Soil Salinity Research Station (CSSRC), Danti-Umbharat. The analysis of variance between families (crosses) revealed that the mean squares due to crosses were significant for all the characters. A significant difference was observed among the generations in all the characters studied for all three crosses. Highly significant and positive relative heterosis, heterobeltiosis and inbreeding depression were recorded in all the crosses for most of the traits. Significant heterosis over mid-parent and better parent, along with positive inbreeding depression, may be attributed to a major contribution from dominance (h) and additive × additive (i) gene effects, where selection will be effective only in later generations. High to moderate heritability (Narrow-sense) estimates coupled with moderate to high genetic advance was observed for most of the characters in all three crosses. High heritability coupled with a high genetic advance was most likely due to additive gene effects. So, characters having high heritability coupled with high genetic advance can be further improved by adopting selections in succeeding generations.