Studies on the inheritance and types of gene action for some summer squash characters [electronic resource].

Includes references.

This investigation was carried out during two summer seasons 2010 and 2011 to study the heterosis and combining ability for some traits in summer squash at El-Kanater El-Khyreia Experimental Station of Hort. Res. Institute. Six parental lines viz., M1, M2, M3, M4, M5'and M6 were used in this study.In 2010 all possible crosses, without reciprocals; were made to produce the 15 F1s. In 2011, the 15 crosses and their parents were evaluated for some important characters. Combining ability and heterosis were measured for all studied traits .The obtained results could be summarized as folloWs: (1)Highly significant differences for general and specific combining abilities were found for all studied characters. (2) The high estimated ratio between GCA and SCA mean squares were found for most studied traits. (3) Line M3 was the best combiner for most studied characters, followed by the lines M1 and M2. (4) Certain crosses had high SCA effect values for certain traits. The best crosses were "M1 x M6", " M2 x M3" and " M3 x M6", since they showed significant SCA effect values for most evaluated traits.

Summary in Arabic.

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