Horticultural evaluation of advance breeding lines possessing different combinations of Ty and Ph genes in tomato (Solanum lycopersicum L.)

摘要

Agro-statistics, India is the second largest tomato producer only after China in the world. Tomato crop is grown round the year due to wider adaptability but production is adversely affected due to high incidence of tomato leaf curl virus and late blight diseases. These pathogens have enormous capacity to generate new forms and control of these pathogen are mainly achieved by chemical approaches which is not safe for environment as well as for human beings and also add an extra cost in tomato production. Therefore resistance breeding is best approach to manage these types of diseases along with improvement of yield and quality parameters. Five genes viz. Ty-1, Ty-2, Ty-3, Ph-2 and Ph-3 were tried to pyramid from different parent through hybridization to achieve resistance against tomato leaf curl virus and late blight diseases. In this study, 122 advance breeding lines of tomato were evaluated in 2016-17 and 2017-18, through phenotypic and genotypic screening to identify best lines having resistance to both the diseases with better horticultural traits. Punjab Chhuhara cultivar was used as common susceptible check to both the diseases while PVB-4 and LBR-10 were used as resistant checks for tomato leaf curl virus and late blight disease, respectively. Out of 122 lines evaluated, 12 lines were found to be having resistance against both the diseases with different combination of Ty and Ph genes. Among them, four lines viz. TW-4-5G-12, TW-5-1E-7, PR-DH-15-7-11 and PR-DH-28-11G-13 having resistant to both diseases and produces 3.14, 3.90, 2.74 and 3.84 yield kg plant-1 which is more than all the three standard checks. These resistant lines could be evaluated in multi-locations for their commercial exploitation.