Abstract:
This study was conducted using twenty tomato genotypes to assess the performance
of yield and yield related characters during the period from November, 2022 to April,
2023. Analysis of variance was noticed highly significant of differences for all the
studied characters. Phenotypic coefficient of variation (PCV) was recorded higher for
all the parameters than the genotypic coefficient of variation (GCV), suggesting
environmental influences on the exposure of all the traits. High heritability was found
for all the characters. High heritability along with high genetic advance in percent of
mean was noted for no of branches per plant, clusters per plant, flowers per cluster,
fruits per cluster, fruits per plant, fruit weight fruit length, fruit diameter, and fruit
yield per plant, indicating the presence of additive gene action and suggesting that,
there is a possibility of simple selection based on those character in further breeding.
The correlation coefficient showed that, fruit yield per plant had positive and
significant correlation with fruits per plant (G=0.85, P=0.82), fruit weight (G=0.76,
P= 0.74), fruit length (G=57, P=55), fruit diameter (G=0.79, P=0.76). The path
coefficient analysis revealed that, days to first flowering (3.427), fruits per cluster
(0.139), fruits per plant (1.426), fruit weight (0.239), and fruit diameter (0.572) had
positive and direct effect on the fruit yield per plant. Cluster analysis of the twenty
tomato genotypes produce three different clusters. Cluster I, cluster II, cluster III had
the six, five and nine genotypes, respectively. Cluster II was found to present the
highest value for intra-cluster distance (3.85) and the maximum inter-cluster distance
was noted between the cluster I and cluster III, which is (6.98). Considering the
magnitude of cluster mean and agronomic performances of the tomato genotypes,
from the cluster III, G7 (BD-7276) for minimum plant height, G4 (BD-7265) for
maximum weight of fruit, G8 (BD-7277) for minimum days to first flowering, days to
50% flowering, and days to maturity; and from the cluster II G18 (BARI- 17) for
clusters per plant, flowers per cluster, fruits per cluster, fruits per plant, fruit length,
fruit diameter, and fruit yield per plant could be selected for further breeding program.
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
