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Heterosis and combining ability in cucumber [electronic resource].

By:

Abd Rabou, A. M

Contributor(s):

Hamed, A. A

Language: English Summary language: Arabic Description: p.181-191Other title:

قوة الهجين و القدرة على التآلف في الخيار [Added title page title]

Uniform titles:

Egyptian journal of plant breeding, 2011 v. 15 (4) [electronic resource].

Subject(s):

Online resources:

Full Text Article.

In: Egyptian Journal of Plant Breeding 2011.v.15(4)Summary: This study was conducted in research farm and laboratories of Horticultural Research Institute, Agrie. Res. Center (ARC) during the period from 2009 to 2011 to estimate heterosis, general and specific combining ability of some cucumber economic characters, v;z., main stem length (MSL), number of branches/plant (NB), number of female flowers / plant (NFF), average fruit length (AFL), average fruit diameter (AFD), average fruit weight (AFW), early yield/plant (EY), and total yield/plant (TY). Five different inbred lines of cucumber, namely Cus 3-2-14 (P₁), Cus 1-27-608 (P₂), Cus 2-11-519 (P₃), Cus 1-12-26 (P₄), and Cus 2-23-576 (P₅) were used as parental lines in the present investigation. Diallel crosses (without reciprocal) were made between these parents to obtain ten hybrids. Results showed that some hybrids were taller and of higher NB, AFL, and AFW than the highest parent. Most crosses were earlier and had higher TY. However, all crosses had lower NFF, and AFD. General and specific combining ability were highly significant for most studied traits and the variance of SCA was greater than that of GCA in the traits EY and T.Y, however, GCA was greater than SCA variance for the traits MSL, NB, NFF, AFL, AFD, and AFW. These results indicate that all these traits were influenced by both GCA and SCA with the later having a greater influence for the traits EY and T.Y, which reflects the role of non-additive type of .gene action in the expression of these traits. On the contrary, the other characters exhibited that GCA was more important than SCA by nearly two times or more which reflects the role of additive type of gene action in the expression of these traits. The parental lines P₂ and P₄ were good general combiners and the cross P₁ x P₄, P₂ X P₃, P₂ X P₅, P₃ X P₄, and P₃ x P₅ were the best and promising hybrids. However, the results also pointed to the potential of certain crosses as source for selecting high yielding lines in their segregating generations because additive gene effects were responsible for their performance.

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This study was conducted in research farm and laboratories of Horticultural Research Institute, Agrie. Res. Center (ARC) during the period from 2009 to 2011 to estimate heterosis, general and specific combining ability of some cucumber economic characters, v;z., main stem length (MSL), number of branches/plant (NB), number of female flowers / plant (NFF), average fruit length (AFL), average fruit diameter (AFD), average fruit weight (AFW), early yield/plant (EY), and total yield/plant (TY). Five different inbred lines of cucumber, namely Cus 3-2-14 (P₁), Cus 1-27-608 (P₂), Cus 2-11-519 (P₃), Cus 1-12-26 (P₄), and Cus 2-23-576 (P₅) were used as parental lines in the present investigation. Diallel crosses (without reciprocal) were made between these parents to obtain ten hybrids. Results showed that some hybrids were taller and of higher NB, AFL, and AFW than the highest parent. Most crosses were earlier and had higher TY. However, all crosses had lower NFF, and AFD. General and specific combining ability were highly significant for most studied traits and the variance of SCA was greater than that of GCA in the traits EY and T.Y, however, GCA was greater than SCA variance for the traits MSL, NB, NFF, AFL, AFD, and AFW. These results indicate that all these traits were influenced by both GCA and SCA with the later having a greater influence for the traits EY and T.Y, which reflects the role of non-additive type of .gene action in the expression of these traits. On the contrary, the other characters exhibited that GCA was more important than SCA by nearly two times or more which reflects the role of additive type of gene action in the expression of these traits. The parental lines P₂ and P₄ were good general combiners and the cross P₁ x P₄, P₂ X P₃, P₂ X P₅, P₃ X P₄, and P₃ x P₅ were the best and promising hybrids. However, the results also pointed to the potential of certain crosses as source for selecting high yielding lines in their segregating generations because additive gene effects were responsible for their performance.

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