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Genetic studies on seed yield of squash Cucurbita pepo L. [electronic resource].

By:

Etman, Nagwa M

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Language: English Summary language: Arabic Description: p.21-39Other title:

دراسات وراثية على المحصول البذري في الكوسة.‪ [Added title page title]

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Journal of biological chemistry and environmental sciences, 2008 v. 3 (4) Part I [electronic resource].

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In: Journal of Biological Chemistry and Environmental Sciences 2008.v.3(4)ISummary: Eight inbred lines of squash (Cucurbita pepo L.) were used in making half dianel set of crosses to determine some of the genetic parameters which are necessary in breeding programs to improve seed yield as well as seed oil and protein content. The results showedsignificant general and specific combining ability effects for seed yield/plant, 1000-seeds weight, seed net weight percentage, and total oils and protein percentage of seeds indicating the presence of additive and non-additive gene effects in the inheritance of these characters. However, the calculated ratio GCAISCA was more than unity, which indicates that the additive genetic variance component is the larger component comparing to other types of genetic variance components. The broad sense heritability values were 88.84%, 86.38%, 67.22%, 81.89%, and 97.28%, while the narrow sense heritability values were 2.00%, 66.60%. 47.08%, 29.63%, and 35.07%, for seed yield/plants 1000-seeds weight, seed net weight percentage, and total oils and protein percentage of seeds, respectively. These results indicate the influence of the environmental factors and non-additive type of gene action on the expression and inheritance of this character.

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Eight inbred lines of squash (Cucurbita pepo L.) were used in making half dianel set of crosses to determine some of the genetic parameters which are necessary in breeding programs to improve seed yield as well as seed oil and protein content. The results showedsignificant general and specific combining ability effects for seed yield/plant, 1000-seeds weight, seed net weight percentage, and total oils and protein percentage of seeds indicating the presence of additive and non-additive gene effects in the inheritance of these characters. However, the calculated ratio GCAISCA was more than unity, which indicates that the additive genetic variance component is the larger component comparing to other types of genetic variance components. The broad sense heritability values were 88.84%, 86.38%, 67.22%, 81.89%, and 97.28%, while the narrow sense heritability values were 2.00%, 66.60%. 47.08%, 29.63%, and 35.07%, for seed yield/plants 1000-seeds weight, seed net weight percentage, and total oils and protein percentage of seeds, respectively. These results indicate the influence of the environmental factors and non-additive type of gene action on the expression and inheritance of this character.

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