Genetic study of heterosis for yield and quality components in tomato (Solanum lycopersicum)

摘要

Magnitude of heterosis, combining ability effects and its variances were estimated by line × tester analysis including 30 F1 cross combinations using 13 parents after selfing (ten lines and three testers) at Vegetable Research Farm, BHU, Varanasi (India). These 43 genotypes (10 lines and 3 testers and 30 resulting F1 hybrids) were evaluated for growth, yield and quality (T.S.S and shelf life) contributing traits. Ratio of general combining ability (GCA) and specific combining ability (SCA) variance revealed preponderance of non- additive genetic variances for all studied traits. On the basis of GCA effects across ten traits, Potato Leaf, Pant T-7, IC-177371 and NDTVR-60 were identified as most promising parental lines for inclusion in hybridization programmes. Outstanding crosses based on SCA effect across ten traits were RCMT-2 × VR-20, LCT-6 × VR-20 and Azad T-5 × VR-20. These crosses could be considered as most promising specific combiner for most of the traits in which VR-20 was have found to be best general combiner. The most promising crosses showing significantly standard heterosis for maximum yield were CO-3 × Arka Vikas, CO-3 × NDT-5, NDTVR-60 × NDT-5 and RCMT-1 × NDT-5. These elite hybrids may be tested for yield and other quality traits under different agro-climatic conditions for commercial exploitation of hybrid vigour.