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ThesisItem Restricted Evaluation of Tomato Hybrids Suitable For Spring Season Cultivation(Punjab Agricultural University, Ludhiana, 2021) Aeer Somkant Dattaram; Jindal, S. K.The present investigation in tomato (Solanum lycopersicum L.) was conducted at PAU, Ludhiana during 2020-21 with the objective of developing hybrids suitable for spring season cultivation possessing maximum harvesting span along with desirable horticultural traits. The experimental material comprised of 56 F1 hybrids (developed by line × tester method), 18 parental lines (14 lines and 4 testers of ripening mutants) and one standard check „PTH-2‟ were transplanted in randomized complete block design with three replications. Evaluation was carried out for all the experimental material in main as well as spring season. The ratio σ2SCA/ σ2GCA was more than unity for all characters except average fruit weight in main and spring season and locules per fruit, pericarp thickness, TSS, dry matter and lycopene content in spring season, which indicated the predominanace of non-additive effects in both seasons. Lines, FL-556 and Punjab Ratta in main and spring season respectively whereas, tester alc-IIHR-2050 in both season resulted as good general combiners for most of characters. Cross, SMZ-867 × rin-Rutgers in main season and SMZ-867 × nor-RM-1 in spring season possessed good SCA effects for most of the characters. Cross combinations viz. PAU 114 × nor-RM-1, PAU 2381 × nor-RM-1 in main season while, crosses LT-44 × rinRutgers, PAU 2381 × rin-Rutgers in spring season recorded significant heterosis over better parent and check in terms of yield and other quality traits. Out of fifty six hybrids the combinations, CLN1621L × alc-IIHR-2050, LT-44 × rin-Rutgers in main as well as spring season, PAU 2381 × nor-RM-1, Leader × nor-RM-1, LT-42 × alc-IIHR-2050 and Roma × nor-RM-1 in main season and PAU 2381 × rin-Rutgers, FL-556 × rin-Rutgers, FL-556 × alcIIHR-2050 and LT-44 × alc-IIHR-2050 in spring season were recorded for prolonged harvesting span vis-à-vis desirable quality attributes particularly fruit yield, fruit weight, minimum days from transplanting to first harvest, pericarp thickness, lycopene content, dry matter, TSS and titratable acidity with fair amount of heterosis. Therefore, the hybrid crosses which expressed higher yield potential in addition with acceptable qualitative performance together with maximum harvesting span i.e. prolonged fruit availability period could be utilized for commercial exploitation
