GENETIC EVALUATION OF LETTUCE (Lactuca sativa L.) GERMPLASM UNDER PROTECTED CONDITIONS
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Date
2013
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The present investigation entitled “Genetic evaluation of lettuce (Lactuca sativa L.) germplasm under protected conditions” was carried out at experimental farm of Department of Vegetable Science, Dr YS Parmar University of Horticulture and Forestry, Nauni, Solan (HP) during 2011-12 and 2012-13. The experiment was laid out in a RCBD with three replications. Twenty eight genotypes including check cultivars (Simpson Black Seeded and Great Lakes) were evaluated for different horticultural traits. The observations were recorded on days to marketable maturity, leaf colour, number of non-wrapper leaves, gross and net head weight, heading percentage, yield per plot, β-carotene, calcium & iron contents, seed germination, seed vigour index-I & II, 1000-seeds weight, head shape index and incidence of diseases. Analysis of variance showed highly significant differences among genotypes for all the characters under study. Six genotypes namely UHF-Sel.-06, UHF-Sel.-03, UHF-Sel.-01, CGN-05167, CGN-10944 and CGN-14629 gave higher yield over both the check cultivars and also performed better for other horticultural traits viz. days taken to marketable maturity, gross and net head weight, heading percentage, 1000-seeds weight, seed germination percentage, seed vigour index-I and II. Genotype UHF Sel.-07 performed better than both the checks for β-carotene and iron contents. Genotypes Sol. Let.-1, CGN-20721, CGN-05167 and CGN-14651 showed field resistance against the incidence of sclerotinia rot and gray mould diseases under protected conditions. High heritability estimates coupled with moderate genetic gain were observed for yield and other horticultural traits. Yield was positively correlated with gross and net head weight, seed germination, seed vigour index-I & II and 1000-seeds weight and also showed maximum direct effects towards yield per plot. Maximum number of genotypes viz., 10, 8, 5, 3 and 2 were accommodated by cluster-V followed III, IV, I and cluster-II respectively. Further divergence studies indicated that hybridization between cluster-I and IV in both the cases can be utilized for getting the superior recombinants in segregating generations