Development and evaluation of f1 hybrid(s) for resistance to late blight and root knot nematodes in tomato (Solanum lycopersicum L.)
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Date
2014
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Punjab Agricultural University, Ludhiana
Abstract
The present investigation in tomato (Solanum lycopersicum L.) was conducted at PAU, Ludhiana during 2013-14 with the objective of developing hybrids possessing resistance to tomato late blight and root knot nematodes along with desirable horticultural traits. The experimental material comprised of 40 F1 hybrids (developed by line × tester method), 14 parental lines (10 lines and 4 testers), one susceptible check (Punjab Upma) and one standard check (TH-1) were transplanted in randomized complete block design with three replications. The ratio of σ2SCA/ σ2GCA was more than unity for all the characters except dry matter which indicated the predominance of non-additive effects. Line, LBR-12 and tester, 8-2-1-2-5 was found to be good general combiner for most of the traits. Cross, LBR-7 × 8-2-1-2-5 was observed good specific combiner for most of the traits while cross combinations viz.LBR-19 × 8-2-1-2-5, LBR-19 × EC-119197 and LBR-15 × 1-6-1-4 were highly heterotic over better parent and standard check in terms of yield, fruit and quality traits. Natural, artificial and molecular screening (genotype screening) was performed for all the experiment material against late blight and root knot nematodes resistance. Out of forty hybrids, the combination LBR-19 × 8-2-1-2-5, LBR-12 × EC-119197 and LBR-6 ×1-6-1-4 were recorded for combined resistance to late blight and root knot nematodes vis-à-vis desirable traits particularly fruit yield, fruit weight, pericarp thickness, TSS and dry matter with fair amount of heterosis. Therefore, hybrids which expressed better yield potential with acceptable qualitative performance along with diseases resistance compared to the existing varieties/hybrids could be used for commercial utilization.
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Keywords
tomato, nematodes, late blight, Heterosis