Abstract:
A field experiment was conducted during November 2010 to March 2011 to study the
genetic variability, correlation, path co-efficient analysis and genetic diversity 1,61.
quantitative traits in tomato (Solanum h'coperszcon) with thirty seven genotypes iii
randomized block design with three replications. The genotypes were placed in a held
expernent conducted at the research farm of Sher-e-Rangla :'\gricultLlral l_1 niversity.
Dhaka- I 207. 1 he analysis of variance indicated significantly higher amount of variability
among the genotypes for all the characters. Considering genetic parameters high genotypic
co-el hcient of variation ((XV ) was observed lor number of fruits per cluster. number of
fruits per plant. fruit weight and fruit yield per plant whereas days to first flowering. das to
500%, (lowering and days to maturity showed low GCV. In all cases. phenotypic arianees
were higher that) the genotypic variance. High heritability with low genetic advance in
percent ol' mean was observed for days to maturity, number ol clusters per plant. number of
fruits per cluster, fruit length. fruit diameter and fruit yield per plant which indicated that
non-additive gene effects were involved for the expression of these characters and selection
br such traits miuht not be rewarding. I Ugh heritability with high genetic advance in
percent of mean 'as observed for number of fruits per plant and Fruit weight indicating that
these traits were under additive gene control and selection lbr genetic inproement for
these traits would be effective. 11w results obtained. sho"ed that fruit yield per plant had
high positive and high significant relation with fruit weight. fruit length and fruit diameter
but high negative and signi Iieant relation with number of clusters per plant. Path
co-efficient analysis revealed that days to 50% Ilowering. number of clusters per plant.
number of fruits per plant fruit weight and fruit length had high positively direct el'Iet on
yield of tomato. So. these characters could be used on direct selection (or yield
improvement. Multivariatc analysis based on twelve agronomic characters indicated that the
thirty seven genotypes were grouped into six distant clusters. 'l'he maxi num contribution of
characters towards diversity was observed by days to Lirst (lowering, days of 50%
flowering. days to maturity and plant height. Thus. these traits may be given high emphasis
while selecting the lines for hybridization. The inter cluster distance was maximum between
cluster V and cluster VI. The highest intra-eluster distance was found in cluster IV.
Considering all the characters G (BD-7269). (h U31)-7276). () (I3D-7278).
G,5 (BD-7295). Ci; (BARI Tomato-I 1). 034 (I3ARI 'l'omato-14) and ( (J3ARI l'oniato-1 5)
can be selected fbi I'uture breeding programme.
Description:
A Thesis
Submitted to the Faculty of Agriculture,
Sher-e-Bangla Agricultural University, Dhaka,
in partial fulfillment of the requirements
for the degree of
MASTER OF SCIENCE IN GENETICS AND PLANT BREEDING
SEMESTER: Jul-Dec’ 2010