Combining ability and gene action studies for different yield contributing traits in cucumber
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https://doi.org/10.5958/0974-0112.2020.00070.5Keywords:
Cucumis sativus, GCA, SCA, predictability ratio.Issue
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Copyright (c) 2020 Indian Journal of Horticulture

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Abstract
Combining ability and gene action were studied in diallel design (without reciprocal) using six genotypes namely Khira-75, UHF-CUC-1, UHF-CUC-2, UHF-CUC-3, Poinsette and PI-618860. Its information is important for making breeding plans, general combining ability (GCA) studies revealed that P1-618860, UHF-CUC-1, UHF-CUC-2 and Khira-75 were observed to be good combiners for a number of traits, including yield per plot and per hectare. However, the estimates of specific combining ability (SCA) showed the highest desirable SCA effects in crosses Khira-75 × PI-618860, UHF-CUC-1 × PI-618860 and UHF-CUC-3 × PI-618860 for earliness and other desirable traits including yield per plot and per hectare. Predictability ratio and average degree of dominance was observed to be less than 1 for most of the horticultural and yield contributing traits indicating the importance of non-additive components of variance for improvements of these traits. The results indicated the importance of heterosis breeding for effective utilization of non-additive genetic variance in cucumber.
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