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2012 - 20142
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Subject: Vegetable Science × End date: 2014 × Start date: 2010 × Type: Thesis × Thesis Type: M.Sc ×
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    ThesisItemOpen Access
    EFFECT OF ETHEPHON AND ETHYLENE GAS ON RIPENING AND QUALITY OF WINTER TOMATO (Solanum lycopersicum L.)
    (PAU Ludhiana, 2012) Prince Deep Singh; P.S., BRAR
    The investigation was carried out to obtain information about effect of ethephon and ethylene gas on ripening and quality of winter tomato (Solanum lycopersicum L.) using two hybrids (Hybrid-1001 and Avinash-3). The first experiment comprised of treatment of mature green tomatoes with different concentrations of aqueous solution of ethephon (500, 1000 and 1500 ppm) for 5 minutes. The fruits were packed in plastic crates and kept in storage room at 20±1oC and 90-95% RH. The second experiment comprised of exposing the mature green tomatoes to ethylene gas (100 ppm) inside the ripening chamber for 24 hours (20±1oC and 90-95% RH) and thereafter kept in the ripening chamber maintained at 20±1oC and 90-95% RH. The one lot of fruits was not treated and kept as control. The physico-chemical parameters of fruits from mature green to senescent stage of maturation were analyzed. The ethylene gas (100 ppm) treatment registered the highest ripening percentage. The ripening and rotting percentage increased with increase in the concentration of ethephon (500-1500 ppm) and with the duration of days for which the fruits were kept for ripening. The titratable acidity of tomato fruits experienced a linear decline but ascorbic acid and lycopene content registered an increase with the advancement of ripening period irrespective of any treatment. The tomato fruits harvested at green mature stage get successfully ripened in 9 days with application of ethephon (500, 1000, 1500 ppm) but the rotting was more than 14 per cent till 9th day in both the hybrids which makes fruits unmarketable. Therefore, the application of ethephon for ripening is not a good option. Treatment with ethylene gas (100 ppm) resulted in adequate ripening of fruits after 9 days with uniform red colour, desirable firmness, minimum rotting and acceptable quality and therefore this treatment is better over ethephon. In control fruits similar results of ripening, firmness, rotting and quality were observed as in case of ethylene gas (100 ppm) treatment but the fruits get longer time (11 days) to uniformly ripen.
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    ThesisItemOpen Access
    Development and evaluation of f1 hybrid(s) for resistance to late blight and root knot nematodes in tomato (Solanum lycopersicum L.)
    (Punjab Agricultural University, Ludhiana, 2014) Vipesh Kumar; Jindal, S. K.
    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.