Dr. M. VIJAYAAkarsh. H. L2019-09-272019-09-272019-07-15Sri Konda Laxman Telangana State Horticultural University, Rajendranagar, Hyderabad-30http://krishikosh.egranth.ac.in/handle/1/5810129638The present investigation entitled “Heterosis, combining ability for yield, yield attributes and screening for fusarium wilt (Fusarium oxysporum f.sp. lycopersici) resistance in tomato (Solanum lycopersicum L.)” was conducted during kharif-2018 and Rabi, 2018 to 2019 at College of Horticulture, Rajendranagar, Sri Konda Laxman Telangana State Horticultural University, Hyderabad with the aim to develop more heterotic hybrids. The main objective objectives of the investigation were to estimate the magnitude of heterosis and estimation of gca and sca effects of the parents and hybrids, respectively for yield contributing traits and resistance for Fusarium wilt. Line × Tester mating design was undertaken with seven lines (Money Maker EC620481, EC620509, EC620474, EC620441, EC620446 and EC620452) and three testers (AVTO1219, Pant Bahar and EC620428). The resulted twenty one hybrids along with parents and three checks (Arka Rakshak, Arka Vikas, and Pusa Ruby) evaluated in Rabi 2018-2019 in Randomized Block Design with three replications to study heterosis and combing ability of seventeen yield and yield related traits. Analysis of variance of parents and hybrids for yield and yield attributes revealed that replication mean sum of squares due to parents and hybrids were non-significant for all the traits studied, so there is no environmental error in controlling these characters. Treatment mean sum of squares due to parents and hybrids were highly significant for all the traits, indicating that there is lot of variations between the characters studied. Further, the Line × Tester effect was found significant for all the characters. The mean performances of the four crosses viz., Money Maker × AVTO1219 (3.45kg), EC620474 × Pant Bahar (3.39kg), EC620452 × EC620428 (3.18kg) and EC620441 × AVTO1219 (3.17kg) were found superior over the standard check Arka Rakshak(2.80kg). The ratios of GCA and SCA variances revealed that non-additive gene action was predominant for all the character except plant height. Hence, heterosis breeding is ideal to improve these traits. For additive gene action i.e., direct selection by pure line selection or progeny selection or hybridization and selection with pedigree method could be employed to improve these traits. The gca effects of the parents revealed that three lines viz., EC620474, EC620452 and EC620446 and two testers AVTO1219 and EC620428 were found to be promising general combiners for yield per plant and most of the other traits. Hence, these inbreds are to be utilized for potential application in crop improvement programmes. Based on significant sca effects, four hybrids viz., Money Maker × AVTO1219, EC620474 × Pant Bahar, EC620481 × Pant Bahar and EC620446 × EC620428 were found to be promising specific combiners for yield per plant and most of the other traits. Significant and standard heterosis over check Arka Rakshak for fruit yield per plant was recorded in four hybrids viz., Money Maker × AVTO1219 (23.24%), EC620474 × Pant Bahar (21.33%), EC620441 × AVTO1219 (13.83%) and EC620452 × EC620428 (13.83%) showed high and significant standard heterosis. Screening for Fusarium wilt resistance among the twenty one hybrids, three hybrids (EC620481 × AVTO1219, EC620441 × AVTO1219, EC620446 × EC620428) were recorded highly resistant, four hybrids were recorded resistance to Fusarium wilt, thirteen hybrids were recorded moderately resistant and two hybrids were moderately susceptible over the highly susceptible check. All the fourteen hybrids cross with AVTO1219 and EC620428 were recorded for molecular resistance under I-2 gene. Keeping in view of the above facts, by considering all the factors like mean performance, sca effects, standard heterosis the most promising hybrids were Money Maker × AVTO1219, EC620474 × Pant Bahar and EC620441 × AVTO1219 with good mean performance and sca effects for yield, yield attributes, quality and disease resistance.The present investigation entitled “Heterosis, combining ability for yield, yield attributes and screening for fusarium wilt (Fusarium oxysporum f.sp. lycopersici) resistance in tomato (Solanum lycopersicum L.)” was conducted during kharif-2018 and Rabi, 2018 to 2019 at College of Horticulture, Rajendranagar, Sri Konda Laxman Telangana State Horticultural University, Hyderabad with the aim to develop more heterotic hybrids. The main objective objectives of the investigation were to estimate the magnitude of heterosis and estimation of gca and sca effects of the parents and hybrids, respectively for yield contributing traits and resistance for Fusarium wilt. Line × Tester mating design was undertaken with seven lines (Money Maker EC620481, EC620509, EC620474, EC620441, EC620446 and EC620452) and three testers (AVTO1219, Pant Bahar and EC620428). The resulted twenty one hybrids along with parents and three checks (Arka Rakshak, Arka Vikas, and Pusa Ruby) evaluated in Rabi 2018-2019 in Randomized Block Design with three replications to study heterosis and combing ability of seventeen yield and yield related traits. Analysis of variance of parents and hybrids for yield and yield attributes revealed that replication mean sum of squares due to parents and hybrids were non-significant for all the traits studied, so there is no environmental error in controlling these characters. Treatment mean sum of squares due to parents and hybrids were highly significant for all the traits, indicating that there is lot of variations between the characters studied. Further, the Line × Tester effect was found significant for all the characters. The mean performances of the four crosses viz., Money Maker × AVTO1219 (3.45kg), EC620474 × Pant Bahar (3.39kg), EC620452 × EC620428 (3.18kg) and EC620441 × AVTO1219 (3.17kg) were found superior over the standard check Arka Rakshak(2.80kg). The ratios of GCA and SCA variances revealed that non-additive gene action was predominant for all the character except plant height. Hence, heterosis breeding is ideal to improve these traits. For additive gene action i.e., direct selection by pure line selection or progeny selection or hybridization and selection with pedigree method could be employed to improve these traits. The gca effects of the parents revealed that three lines viz., EC620474, EC620452 and EC620446 and two testers AVTO1219 and EC620428 were found to be promising general combiners for yield per plant and most of the other traits. Hence, these inbreds are to be utilized for potential application in crop improvement programmes. Based on significant sca effects, four hybrids viz., Money Maker × AVTO1219, EC620474 × Pant Bahar, EC620481 × Pant Bahar and EC620446 × EC620428 were found to be promising specific combiners for yield per plant and most of the other traits. Significant and standard heterosis over check Arka Rakshak for fruit yield per plant was recorded in four hybrids viz., Money Maker × AVTO1219 (23.24%), EC620474 × Pant Bahar (21.33%), EC620441 × AVTO1219 (13.83%) and EC620452 × EC620428 (13.83%) showed high and significant standard heterosis. Screening for Fusarium wilt resistance among the twenty one hybrids, three hybrids (EC620481 × AVTO1219, EC620441 × AVTO1219, EC620446 × EC620428) were recorded highly resistant, four hybrids were recorded resistance to Fusarium wilt, thirteen hybrids were recorded moderately resistant and two hybrids were moderately susceptible over the highly susceptible check. All the fourteen hybrids cross with AVTO1219 and EC620428 were recorded for molecular resistance under I-2 gene. Keeping in view of the above facts, by considering all the factors like mean performance, sca effects, standard heterosis the most promising hybrids were Money Maker × AVTO1219, EC620474 × Pant Bahar and EC620441 × AVTO1219 with good mean performance and sca effects for yield, yield attributes, quality and disease resistance.ennullThesis