Heterosis and Combining Ability in Cucumber under Greenhouse Conditions. | ||||
| Horticulture Research Journal | ||||
| Volume 2, Issue 4, December 2024, Page 73-84 PDF (905.79 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/hrj.2024.396126 | ||||
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| Abstract | ||||
| Five inbred lines of cucumbers (Cucumis sativus var. sativus L.) that were generated by self-pollination across six generations in a greenhouse at the Ismailia Experimental Station Farm, Agriculture Research Centre, Egypt, between 2017 and 2020 were used in the current study. Ten F1 hybrids were produced by half-diallel crossings between the five parents. Under greenhouse conditions, during the two consecutive winter seasons of 2021/2022 and 2022/ 2023, the genotypes (5 parents, their 10 F1 hybrids, and the commercially hybrid (Hesham F1) under study were evaluated. The traits main stem length, internode length, branch numbers, node of the first female flower, number of female flowers per node, fruit weight, fruit diameter, fruit length, and total yield/plant were measured. The results showed highly significant differences among studied genotypes in all studied characters. Also, the mean squares due to both general (GCA) and specific (SCA) combining abilities were highly significant for all studied characters in both seasons except SCA for fruit diameter trait in the second season. The GCA/SCA ratio was more than unity, which indicates that the additive genetic variance component is more effective in controlling the measured traits. Furthermore, the cross P3 × P4 exhibited desirable positive and negative SCA and heterosis values over mid and better parent in commercial traits which are effective in productivity. Generally, the parent P4 could be used as a promising progenitor for commercial traits in addition to genetic improvements by hybridization. | ||||
| Keywords | ||||
| Cucumber; Cucumis sativus; General combining ability; Heterosis; Cucumber yield | ||||
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