Heterosis and Combining Ability for Some Promising Inbred Lines of Squash. | ||||
| Horticulture Research Journal | ||||
| Volume 3, Issue 4, June 2025, Page 103-109 PDF (495.93 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/hrj.2025.449827 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
| Amr Ahmed EL- Sayed; Mossad Khairy maamoun | ||||
| Department of Vegetables, Medicinal and Aromatic Plant Breeding, Horti. Res. Inst., Agric. Res. Cen., Giza, Egypt. | ||||
| Abstract | ||||
| The current research was conducted between 2023 and 2025 at the Kaha Vegetable Research Farm, affiliated with the Horticulture Research Institute in the Kaliobia Governorate. This investigation involved six inbred lines of summer squash (C. pepo L.). Results showed that the fruit weight of the hybrids ranged from 85.00 g (P1×P2) to 106.00 g (P2×P5), with the hybrid (P2×P5) achieving the highest fruit weight compared to all other evaluated genotypes and the control. Furthermore, the duration until the first female flower appeared significantly differed among the hybrids when compared to the commercial hybrid Yara, with hybrids (P1×P2 and P2×P4) outperforming others by producing the first female flower in fewer days. The parent line P4 recorded the highest total yield among the parental genotypes, while hybrids (P1×P4 and P3×P4) yielded the most. The mid-parent heterosis for all traits examined indicated a highly advantageous heterosis for total yield across all hybrid combinations. The analysis of potence ratio values revealed that most F1 crosses displayed a positive tendency regarding average fruit length, and total yield, indicating a dominance effect towards the superior parent in these characteristics (including partial, complete, and over dominance). Line 1 was recognized as an excellent general combiner, providing significant and positive GCA values for fruit weight and total yield. In contrast, Line 6 excelled as a general combiner for fruit length and total yield. | ||||
| Keywords | ||||
| Cucurbita pepo; Gca; Heterosis; Squash; Potence ratio | ||||
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