STUDIES ON GENETIC VARIABILITY IN TOMATO (Solanum lycopersicumL.) GENOTYPES FOR DIFFERENT HORTICULTURAL TRAITS
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Date
2014
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UHF,NAUNI
Abstract
ABSTRACT
The present investigations entitled “Studies on genetic variability in tomato (Solanum lycopersicum L.)
genotypes for different horticultural traits” was carried out at the Research Farm, Department of Vegetable
Science, Dr YS Parmar University of Horticulture and Forestry, Nauni, Solan (H.P.) during Kharif, 2013 to
evaluate diverse germplasm of tomato. The experiment was laid out in a RCBD with three replications. In this
study, thirty five genotypes including one check cultivar were evaluated for different horticultural traits. The
observations were recorded on days to 50% flowering, number of fruits per cluster, number of fruits per plant,
average fruit weight (g), fruit yield per plant (kg), fruit yield per plot (kg), fruit yield per hectare (q), fruit shape
index, number of locules per fruit, pericarp thickness (mm), plant height (cm), harvest duration (days), days to
marketable maturity, total soluble solids (
o
B), ascorbic acid content (mg/100g), fruit colour, buckeye rot
incidence (%) and alternaria blight severity (%). Analysis of variance showed significant differences among
genotypes for all the characters under study. The genotypes JTS-10-1, JTS-10-2, Yalabingo, EC-37239, EC-267727, LE-79-5, BT-10, EC-191535-3 and JTS-1-1 gave highest fruit yield. High phenotypic and genotypic
coefficients of variation were depicted for the character like number of fruits per plant, fruit yieldper plant, fruit
yield per plot, fruit yield per hectare and plant height. High heritability coupled with high genetic gain were
recorded for number of fruits per plant, plant height, average fruit weight and fruit yield per plant,per plot and
per hectare. Hence selection can prove effective for improvement in yield. High heritability coupled with
moderate genetic gain was observed for number of fruits per cluster, harvest duration and ascorbic acid content.
Therefore, these characters also show some scope for improvement through selection. A highly significant and
positive phenotypic and genotypic correlation of fruit yield per plant was observed with plant height,number of
fruits per plant, harvest duration, number of fruits per cluster, total soluble solids and average fruit weight.
Maximum positive direct effect towards fruit yield per plant was contributed by number of fruits per plant
followed by harvest duration and average fruit weight. The maximum negative direct effect towards yield was
recorded by days to marketable maturity. Further, these genotypes were grouped into four divergent clusters and
hybridization between cluster I and IV gives maximum heterotic combinations.
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