Development and evaluation of hybrid(s) for resistance to late blight and leaf curl virus diseases in tomato (Solanum lycopersicum L.)
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Date
2020
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Punjab Agricultural University, Ludhiana-
Abstract
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.
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Citation
Arora, Healy (2020). Development and evaluation of hybrid(s) for resistance to late blight and leaf curl virus diseases in tomato (Solanum lycopersicum L.) (Unpublished M.Sc. thesis). Punjab Agricultural University, Ludhiana, Punjab, India.