MORPHOLOGICAL AND MOLECULAR CHARACTERIZATION OF CUCUMBER (Cucumis sativus L.) GENOTYPES FOR YIELD AND PRODUCTIVITY TRAITS
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Date
2018-07
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University of Horticultural Sciences , Bagalkot
Abstract
The present investigation was carried out with 35 cucumber genotypes at
Haveli farm, College of Horticulture, Bagalkot (Karnataka) during 2014-16 using
randomized complete block design with two replications. Evaluation for genetic
variability and divergence being the primary objective of the study, experimental data
obtained for yield and yield contributing traits was also subjected to correlation and
path analysis. Further molecular marker profiling using 23 RAPD markers was
performed to know diversity at molecular level.
Variability studies demonstrated higher PCV, GCV, heritability and GAM
implying the existence of sufficient variation among the studied genotypes. High
heritability with high genetic advance was recorded for most of the characters viz.
Vine length, number of branches, number of nodes, internodal length, number of
leaves, tendril length and leaf area, which shows existence of additive gene action
hence these traits can be improved trough direct selection.
Correlation studies revealed that total fruit yield per vine had positive and
significant correlation with number of nodes per vine, number of female flowers per
vine, number of fruits per vine, average fruit weight, yield at all the three pickings and
fruit diameter. Path coefficient analyses revealed that number of fruits per vine,
average fruit weight, yield at first, second and third picking, fruit length and fruit
diameter exerted direct positive effect towards total fruit yield per vine.
By the use of Mahalanobis D2 analysis, 35 genotypes of cucumber were
grouped into 5 distinct clusters. Cluster I comprised of 26 genotypes, cluster II with 6
genotypes. Cluster III, IV and V were solitary with single genotype. Whereas
molecular characterization grouped genotypes into two main clusters. First main
cluster was composed of 27 genotypes and there were 8 genotypes under main cluster
II in the dendrogram.
Genotype UDYC-25 recorded highest fruit yield per vine followed by
UDYC-21 and UDYC-1. The present investigation illustrated the existence of wide
range of variations for most of the characters in cucumber genotypes, providing
opportunities for genetic gain through selection or hybridization in future breeding
programme.
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