Evaluation of heterosis and combining ability using diallel cross in tomato lines for salinity tolerance during seedling stage

H Kaveh, H Nemati, M Farsi, S Vatandoost, T Jalali

Abstract


Great numbers of studies on tomato breeding have been performed for resistance to environmental stresses as well as pests. In genetic investigation and breeding of tomato, it is tried to use tomato lines with the most variance on morphological and agronomical traits to obtain better results. In this survey combining ability and heterosis of 7 inbred lines of tomato and their F1 hybrids were investigated for salinity tolerance during seedling stage using diallel cross. So seed germination percentage and seedling emergence percent and rate under salt stress examined in a complete randomized design with 4 replications. Results of analysis showed that the reciprocal effects and special combing ability (SCA) were significant for all traits on probability of 1 %. Analysis of Wr-Vr regression also showed that seed germination percentage and seedling emergence percentage and rate under salt stress controlled by over dominance effects. Best line for resistance to salt stress in juvenility was R205 which has the most general combing ability (GCA) for all three traits connected to salt resistance.


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