Studies on Heterosis and Inbreeding Depression for Yield and its Attributes in Mungbean [Vigna radiata (L.) Wilczek]

Author: Dalip, S.S. Punia, D.K. Gothwal, G.K. Mittal, S.S. Yadav and R.N. Sharma

Download PDF

Abstract

Eight parents and their resulting 28 F1’s and 28 F2’s crosses were evaluated to study the extent of heterosis and inbreeding depression for yield and its attributing traits in mungbean. Significant positive heterosis was observed in eight crosses for seed yield per plant. This heterosis was observed in either mid-parent or both mid and better parent. Among these crosses, heterosis was coupled with low to high positive significant inbreeding depression in five crosses (HUM 1 × MH 421, HUM 1 × MH 2-15, MH 421 × LGG 460, PUSA 9531 × RMG 975 and LGG 460 × RMG 975). This suggested a considerable decrease in seed yield per plant due to the dissipation of dominance or dominance based interaction effects in the F2 generations of these crosses. Heterosis coupled with inbreeding depression revealed the predominance of non-additive gene action for most of the characters studied. Hence, the cross combinations having desirable significant heterosis for a particular trait may be handled in advanced generations to get desirable combination for the improvement of mungbean crop

Keywords

Mungbean, heterosis, heterobeltiosis, inbreeding depression

Conclusion

Different hybrid combinations exhibited heterosis in both positive and negative directions, indicating the dominance of genes with either positive or negative effects. Additionally, there was significant variation in the degree of heterosis between different crosses, suggesting that the nature of gene action depended on the parents' genetic makeup. The close relationship between heterosis and inbreeding depression for most traits under different environmental conditions indicated the prevalence of non-additive genetic variance in the biological material being studied. Owing to its autogamous genetic architecture and biological constraints of the crop, the heterosis could be exploited only by isolating the desirable segregants for yield attributes by handling advanced generations

References

-

How to cite this article

Dalip, S.S. Punia, D.K. Gothwal, G.K. Mittal, S.S. Yadav and R.N. Sharma (2024). Studies on Heterosis and Inbreeding Depression for Yield and its Attributes in Mungbean [Vigna radiata (L.) Wilczek]. Biological Forum – An International Journal, 16(8): 25-28.