Abstract:
Twenty seven genotypes of snake gourd (Tricliosant/ics anguina 1.) were studied in a field
experiment at the experimental field of Sher-e-l3angla Agricultural University, Dhaka. during
March 2010 to August 2010. The objectives of the study were to measure the variability among
the genotypes for yield and yield contributing characters, estimate genetic parameters.
association among the characters and their contribution to yield. There existed significant
variation for all the characters among the genotypes. High genotypic co-efficient of variation
(GCV) was observed for pedicel length of male flower, number of male flower, number of
female flower. Low genotypic co-efficient of variation (GCV) was observed for leaf length,
fruit breadth, days to first male flowering, days to first female flowering. In all cases
phenotypic variances were higher than the genotypic variances. High heritability with
low genetic advance in percent of mean was observed in days to first female flowering
which indicated that non-additive gene effects were involved for the expression of this
character and selection for such trait might not be rewarding. High heritability with
high genetic advance in percent of mean was observed in number of male flower, number
of female flower, yield per plant indicated that this trait was under additive gene control and
selection for genetic improvement for this trait would be effective. Correlation studies revealed
that highest significant association of yield per plant with the characters fruit weight followed
by fruit breadth, number of male flower, fruit length at genotypic level. Path co-efficient
analysis revealed that maximum direct contribution towards yield per plant was with traits of
number of fruit per plant, fruit weight. fruit breadth and number male flower. Highest intracluster
distance was found in cluster ill, lowest in I. There was only one genotype in cluster II
and Vi. Among six clusters the highest inter cluster distance was observed between cluster II
and cluster Vi and lowest between cluster 1 and cluster IV. Considering all the characters the
014 (BD-l633). 019 (1313-1642), 02 (BD 1608) and Gil (BD-l627) were selected for future
breeding programme.
Description:
A Thesis
Submitted to the Faculty of Agriculture
Sher-e-Bangla Agricultural University, Dhaka,
in partial fulfilment of the requirements
for the degree of
MASTER OF SCIENCE
IN
GENETICS AND PLANT BREEDING
SEMESTER: July-December, 2010