GENETIC VARIABILITY, DIVERGENCE, HETEROSIS AND COMDINING ADILITY STUDIES IN CUCUMDER {Gucumis saUvus L)
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Date
2007-08-31
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University of Agricultural Sciences GKVK, Banglore
Abstract
An investigation was taken up to assess variability, diversity
and combining ability in cucumber during the period from October,
2004 to March, 2006 at Horticulture farm of Agricultural College,
Bheemarayanagudi, Gulbarga.
To assess genetic variability and diversity 45 genotypes were
evaluated. Out of 20 characters studied genotypic and phenotypic
variation were high for marketable fruits per vine. High heritability
coupled with genetic advance over mean were recorded for total fruit
yield per vine. Fruit yield had positive and highly significant
association phenotypically and genotypically with vine length,
intemodal length, number of branches per vine, number of nodes per
vine, fruit length, fruit diameter, average fruit weight, number of
marketable fruits per vine and total number of fruits per vine. Average
fruit weight had positive and direct genotjrpic and phenotypic effect on
fruit yield per vine. Using estimated values 45 genotypes were
grouped into 8 clusters. The highest inter cluster distance was noticed
between IV and V clusters. The intra cluster distance was highest in
Vll cluster.
To determine heterosis and combining ability five lines and
seven testers were selected and subjected to line x tester analysis.
BGDL X Hot Season, BGDL x White Long, BGDL x Hyderabad
cucumber were superior performers owing to the high total fruit yield
per vine and total number of fruits per vine. Among 35 hybrids
maximum positive heterosis over mid and better parent were noticed
in the hybrids BGDL x Hot Season and BGDL x White Long
respectively, for total fruit yield per vine. Variance due to SCA was
higher than GCA for most of the characters studied indicating
involvement of dominant gene action than additive gene action. The
hybrids GBGL x Hyderabad Cucumber and BGDL x Hyderabad
Cucumber were most stable for yield and well adopted to all three
environments.
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