Predicting the Frequency of Transgressive RILs and determining the Minimum Population Size required for their Recovery in Dolichos bean (Lablab purpureus L. Sweet)

Author: M.P. Kalpana, M. Kemparaju, C.B. Siddu and G. Basanagouda

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Abstract

Dolichos bean var. lignosus is one of the important and ancient food legumes extensively grown in southern India. It is commonly known as ‘hyacinth bean’, ‘field bean’, ‘Indian bean’, etc. It is a self-pollinated crop with 2n=22 chromosomes and genome size of 367 Mbp. Efficiency in breeding self-pollinated crops like dolichos bean can be significantly improved by directing resources towards a select few segregating populations with the potential to yield a high frequency of transgressive Recombinant Inbred Lines (RILs) for use as pure-line cultivars. The utilization of an objective criterion for identifying promising segregating populations becomes crucial in this context. One such criterion involves predicting the frequency of transgressive RILs that could emerge from advanced generations of crosses within segregating populations. In our study, we predicted the occurrence of RILs surpassing the performance of the better parent (HA 10-2). This prediction was based on the genetic diversity between two elite parent lines, HA 10-8 and HA 10-2, specifically for grain yield, using estimations of mid parental value [m], additive genetic effects [a], and additive genetic variance [σ2A]. Remarkably, the minimum population size required for the recovery of transgressive RILs was relatively smaller, indicating the feasibility of this approach.

Keywords

Additive effects, transgressive RILs, better parent, grain yield

Conclusion

The study, predicted the occurrence of RILs surpassing the performance of the better parent (HA 10-2). This prediction was based on the genetic diversity between two elite parent lines, HA 10-8 and HA 10-2, specifically for grain yield, using estimations of mid parental value [m], additive genetic effects [a], and additive genetic variance [σ2A]. Remarkably, the minimum population size required for the recovery of transgressive RILs was relatively smaller, indicating the feasibility of this approach.

References

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How to cite this article

M.P. Kalpana, M. Kemparaju, C.B. Siddu and G. Basanagouda (2023). Predicting the Frequency of Transgressive RILs and determining the Minimum Population Size required for their Recovery in Dolichos bean (Lablab purpureus L. Sweet). Biological Forum – An International Journal, 15(9): 1084-1088.