Author(s):

Somayyeh Nezami, Seyed Hossein Nemati, Hossein Arouiee and Mohammad Kafi

Abstract: Improvement of hybrids and cultivars for the heterosis breeding and high production needs recognition of good specific and general combiners. To estimate The GCA, SCA, heterosis, potence ratio and correlation coefficient for earliness, production and other traits in were estimated in 28 F1 hybrids produced from 8 lines tomato (Solanum lycopersicum L.). The line C.JPS3 was a good general combiner for earliness and the highest positive values of GCA effects were in the parent S.2274 for branch length and production per plant, K.2274 for length and diameter of fruit, C.JPS3 for SPAD index, P for weight of single fruit and A13012 for biomass. The best combination for number of leaves to first inflorescence, number of days to turning, production per plant and biomass were C20 × C.JPS3, C20 × S.L, P × H.1370 and A13012 × H.1370, respectively. The parental line S.L. produced the highest mean values for weight of single fruit and biomass and the parental line H.1370 had the highest mean value for production per plant. There were partial-to over-dominance involved in inheritance of these traits. Results of the phenotypic correlation coefficients indicated positive correlations between branch length and fruit length, fruit length and fruit diameter, number of days to turning and production per plant, number of days to turning and biomass, production per plant and biomass. Hybrids with high heterosis and good GCA and SCA for the traits can be used for exploitation of heterosis and released as promising hybrids after multi location testing.

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