EVALUATION OF TOMATO GENOTYPES AGAINST TOMATO YELLOW LEAF CURL VIRUS (TYLCV)

Abstract

Present studies had been conducted to evaluate different varieties and lines of tomato against Tomato yellow leaf curl virus (TYLCV) during the period from October 2014 to March 2015. Five varieties namely BARl Tomato-J, BARl Tomato-Z, BARI Tomato-9, Loc81jessore-2, Local jessore-J and five lines namely BD-7276, BD-7281, BD-7290, BD-7754, BD-7762 were evaluated against Tomato yellow leaf curl virus (TYLCV). The effect of diseases on yield and yield contributing characters were also observed. The tomato varieties and lines differed significantly among themselves in respect of disease incidence. The highest disease incidence was found in Local Jessore-3 (100%), Bd-7281 (100%), BD-7754 (100010) and BD-7762 (100%). The lowest disease incidence was found in the variety BARI Tomato-9 (00%). Considering the performance of selected tomato varieties and lines, it was observed that line BD-7276 was graded as tolerant against Tomato yellow leaf curl virus (TYLCV). The cultivars BARI Tomato-3, BARI Tomato-7, Local Jessore-2 and line BD-7290 showed moderate resistance, while the Jines BD-7762, BD-7754, BD-7281 and Loc81jessore-3 were highly affected by Tomato Yellow Leaf Curl Virus (TYLCV) among different treatments used in the experiment. In case of number of leaves, branch and flowers per plant, the maximum number of leaves, branch and flowers was recorded in the variety BARI Tomato-9 (72.00, 10.67 and 68.33 respectively). The minimum number of leaves, branch and flowers was obtained in the variety Local Jessore-3 (47.67, 6.00 and 51.67 respectively). On the basis of yield and yield contributing characters, the yield performance also differed significantly. The highest yield per plant was recorded in the variety BARI Tomato-9 (2.70 kg) and the lowest in Local Jessore-3 (1.09 kg). In case of the physiological features, we also founded a significant difference among the different varieties and lines. In case of net chlorophyll content, net assimilation rate, intercellular carbon-di-oxide concentration and respiration rate per plant, in 811cases the highest value was recorded in the variety BARI Tomato-9 (65.17,1.03,37.33 and 1.25 respectively) and the lowest was in Local Jessore3 (40.20, 0.33, 16.67 and 0.33 respectively).