Combining Ability Studies in Different Cultivated Species of Tomato for Growth and Yield Attributing Traits

Author: Sheetal Rana, D.K. Singh, Dhirendra Singh, N.K. Singh and Shailbala Sharma

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Abstract

An experiment was conducted with 13 genotypes (10 lines (Solanum lycopersicum var. cerasiforme) and 3 testers (Solanum lycopersicum var. lycopersicum)) and their 30 F1 hybrid obtained from line × tester mating design during 2023. The experiment was laid out in the Randomized Complete Block Design with three replications at Vegetable Research Centre (V.R.C), Govind Ballabh Pant University of Agriculture & Technology, Pantnagar, to estimate the combining ability of various growth and yield attributing traits for their genetic improvement and their effects in the population. Both GCA and SCA variances were highly significant for most of the characters indicating the importance of both additive and non-additive gene actions. CPCT-IARI Cherry-214 was found good general combiner for yield per plant among lines whereas PPT-2 was good general combiner among testers. The crosses identified as good specific combiner for yield per plant were CPCT-263×PBT-5 (0.59) followed by Punjab Red Cherry×PPT-2 (0.29) and CPCT-IARI Cherry-214×PPT-2 (0.25), they also showed SCA effects in desirable direction for more than one trait. Hence can be used in upcoming hybrid breeding programme after stability tests

Keywords

line × tester, Combining Ability, GCA, SCA

Conclusion

It was concluded that for all the growth and yield related traits highly significant variances were observed for specific combining ability and for days to 50% flowering, number of fruit set per cluster, number of primary branches, main stem diameter, fruit yield per plant highly significant variances were observed for general combining ability indicating presence of additive and non-additive gene actions for these traits. Considering higher yield, CPCT-IARI-214 and PPT-2 were found as good general combiner. The three best hybrid combinations showing significant and desirable SCA effect for fruit yield per plant were CPCT-263×PBT-5 (0.59) followed by Punjab Red Cherry×PPT-2 (0.29) and CPCT-IARI Cherry-214×PPT-2 (0.25). The parent with high per se performance might or might not be the best specific cross. It is suggested that breeding techniques that can accumulate detectable genetic effects while maintaining substantial heterozygosity to take advantage of dominant gene effects have proven to be most beneficial for improving the population studied

References

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How to cite this article

Sheetal Rana, D.K. Singh, Dhirendra Singh, N.K. Singh and Shailbala Sharma (2024). Combining Ability Studies in Different Cultivated Species of Tomato for Growth and Yield Attributing Traits. Biological Forum – An International Journal, 16(7): 304-308.