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20201
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Subject: Vegetable Science × Author: Arora, Healy × End date: 2020 × Start date: 2000 × Thesis Type: M.Sc ×
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    ThesisItemOpen Access
    Development and evaluation of hybrid(s) for resistance to late blight and leaf curl virus diseases in tomato (Solanum lycopersicum L.)
    (Punjab Agricultural University, Ludhiana-, 2020) Arora, Healy; Jindal, Salesh Kumar
    The current study in tomato (Solanum lycopersicum L.) was conducted at PAU, Ludhiana during 2019-20 with the objective of developing hybrids possessing combined resistance to late blight and leaf curl virus diseases, along with desirable horticultural characters. The experimental material included 32 F1 hybrids (developed by line × tester method), 12 parental lines (8 lines and 4 testers; including susceptible check Punjab Chhuhara) and standard check NS-524 were transplanted in randomized complete block design with three replications. The values of σ2SCA/σ2GCA were more than unity for all the traits except average fruit weight and ascorbic acid, which indicated the predominance of non-additive effects. Lines CLN-1386-7-0, CLN-104-48-1-0 and CLN-154-22-5-0 resulted as good general combiners for most of characters. Cross combinations viz. PVB-1 × LBR-12 and CLN-138-6-7-0 × LBR-21 possessed good SCA effects for most of the characters, while combinations CLN-154-22-5-0 × LBR-12 and CLN-154-22-5-0 × LBR-21 recorded significant heterosis over better parent and check for fruit yield and other quality characters. Natural and artificial screening was performed for all the experimental material against leaf curl virus and late blight diseases respectively. Out of 32 hybrids, crosses namely CLN-154-22-5-0 × LBR-12, CLN-154-22-5-0 × LBR-21, PVB-1 × LBR-10, PVB-4 × LBR-12, CLN-104-48-1-0 × LBR-10 and CLN-3241H-27 × LBR-21 were identified for combined disease resistance against late blight and leaf curl virus, vis-à-vis desirable horticultural characters particularly fruit yield, average fruit weight, pericarp thickness, dry matter, titratable acidity and ascorbic acid content with fair amount of heterosis. Henceforth, hybrids which displayed good potential in yield with acceptable performance of qualitative traits, along with combined disease resistance could be utilised for commercial purpose exploitation.