Bandyopadhyay, B.B.Kamal Veer2019-11-292019-11-292005-07http://krishikosh.egranth.ac.in/handle/1/5810136404The present investigation was conducted during summer season 2003-04 at G.B. Pant University of Agriculture and Technology, Hill Campus, Ranichauri with fifteen diverse genotypes of tomato cultivars and their 56 F1‟s crosses involving 7 lines and 8 testers. The experiment was conducted in the Randomized Block Design with three replications at mid high hill (2000 above msl) of Ranichauri. Suitable agronomic practices were employed for maintaining normal growth and development of plant. Variability genetic parameters, correlation, combining ability and heterosis were examined out for fourteen characters viz. days taken to germination, days taken to first flowering, number of flowers per plant, number of flower nodes, number of fruits per plant, number of leaves per plant, leaf area, average fruit weight, fruit length, fruit diameter, pericarp thickness, TSS, Ascorbic acid, marketable fruit yield. Analysis of variance revealed that significant differences existed for all traits among genotypes. Correlation study suggested that selection in favour of early germination at control condition on seed bed and number of fruits per plant could increase marketable fruit yield in tomato cultivar. Analysis of variance for combining ability showed that considerable variation existed in five characters viz., days taken to germination, number of fruits per plant, leaf area, fruit length and marketable fruit yield. On the basis of gca effect three lines viz. Sioux, AC-1036 and Pant Bahar were identified as good general combiner. One cross combination viz. Sioux x AC 870 was identified from sca effect, which involved one of the best gca lines (Sioux) as a parent in the cross. Heterosis study revealed that Sioux x AC 807 registered significant positive high values for number of fruits per plant and marketable fruit yield. It may be concluded that Sioux x AC 807 was identified as the best suitable high yielding promising genotypes for the mid high hill and rainfed condition of Uttaranchal state.ennullThesis