Heterosis and combining ability for yield and related traits in cucumber (cucumis sativusl..) under Mekong delta conditions
2014
Tran Kim Cuong; Nguyen Thi Lang
Combining ability and heterosis studies on yield and some related traits in cucumber were carried out through full diallel method using eight parents. The mean square due to GCA and SCA were highly significant for all the characters studied which revealed that both additive and non-additive gene actions were important in the inheritance of these characters. Hence, for the improvement of these traits, both selection and heterosis methods of breeding can be adopted. The parents M4 and B1 were observed to be good combiners for number of characters including yield/plant. The crosses A9xH7, A9x L5, D1 x A9, D1 X M4, H7 X A9, H7 X D1, K13 X M4 and L1 X K13 were most promising combinations for different characters including yield/plant. There are four combinations including A9 X H7,L5x A9, L5xB1 and L1 X D1 having high values of average heterosis, absolute heterosis, and standard heterosis on yield/plant, number of fruits/plant, number of branches/plant and number of female flowers /main vine ; and 5 another combinations including K13 xM4, K13xM4,K13x Bl, M4xA9, M4 x D1 and B1 x A9 having high values of standard heterosis on yield/plant; all these nine hybrid combinations should be tested on all agronomic traits in further trials to select the most promising hybrid combinations.
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