GENETIC AND MOLECULAR STUDIES OF SOME IMPORTANT HORTICULTURAL AND YIELD TRAITS IN CUCUMBER (Cucumis sativus L.)
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Date
2017
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UHF,NAUNI
Abstract
ABSTRACT
The present studies entitled “Genetic and molecular studies of some important horticultural
and yield traits in cucumber (Cucumis sativus L.)” were carried out at the Experimental Research Farm
of the Department of Vegetable Science, Dr YS Parmar University of Horticulture and Forestry, Nauni,
Solan, Himachal Pradesh during the years 2015 and 2016. The experimental material for the present
study comprised of six parents and F1 population of fifteen crosses, developed by crossing these six
diverse cucumber genotypes in diallel design (excluding reciprocals). All the parents and their hybrids
along with the standard check (KH-1) were planted in a Randomized Complete Block Design for their
evaluation in Kharif, 2016. The observations were recorded on days to first female flower appearance,
node number bearing first female flower, days to marketable maturity, fruit length (cm), fruit breadth
(cm), average fruit weight (g), fruit colour, number of marketable fruits per plant, harvest duration
(days), marketable yield per plot (kg) & per hectare (q), total soluble solids (oB), seed germination (%)
and seed vigour index-I and II, incidence of fruit fly (%), severity of powdery mildew (%) and severity
of downy mildew (%). The analysis of variance indicated highly significant differences among the
genotypes for all the traits studied. Experimental results revealed that four genotypes viz., Khira-75,
UHF-CUC-1, UHF CUC-2 and PI-618860 were found superior on the basis of mean performance and
general combining ability studies. Five cross combinations viz., Khira-75 x PI-618860, Khira-75 x
UHF-CUC-1, Khira-75 x UHF-CUC-2, UHF-CUC-1x PI-618860 and UHF-CUC-2 x PI-618860 were
found best on the basis of mean performance, specific combining ability and heterosis studies. Hence,
these hybrid combinations can be tested further at multiplications before releasing as a substitute of
already existing hybrid varieties of cucumber in Himachal Pradesh and in India as well. Gene action
studies indicated predominance of dominance effects in governing most of the traits suggesting
exploitation of hybrid vigour and developing hybrids for improvement of these traits in cucumber on
the basis of present studies. Hybrid purity studies revealed that one primer CSN 160 produced both the
bands in parents as well as in F1 population. Validation of molecular markers was confirmed with
SSR00262, SSR17922, SSR10018 and SSR01331 for earliness, peduncle length and horticulturally
important traits respectively.
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