Abstract:
populations of Brassicanapus were evaluated to study the genetic
variability, correlation, path analysis, genetic diversity and selection of
population based on yield and yield component traits. The experiment was
conducted at the experimental field of Sher-e-Bangla Agricultural University,
Dhaka during November 2016 to February 2017. The experiment was laid out
in Randomized Complete Block Design (RCBD) with three replications.
Analysis of variance revealed significant variations were observed among the
genotypes for all the traits studied. Considering genetic parameters, high GCV
values were observed for number of secondary branches per plant and seed
yield per plant. High heritability values coupled with high genetic advances in
per cent mean were obtained for number of secondary branches per plant,
number of siliqua per plant and seed yield per plant. Correlation studies
revealed significant positive association of seed yield per plant with plant
height, number of secondary branches per plant, siliquae per plant and 1000
seed weight at both genotypic and phenotypic levels. Path coefficient indicated
positive direct contribution towards seed yield per plant through siliquae per
plant, seeds per siliqua, 1000 seed weight, plant height and primary branches
per plant.The genotypes were grouped into five clusters. The highest nine
populations were included under the Cluster III and the cluster II contained the
lowest with solitary. Cluster II and cluster V shown the highest distance
indicating genotypes from these two clusters were diverse. While the lowest
inter-cluster distance was observed between cluster III and IV. Considering
group distance, seed yield per plant and other agronomic performance
genotypes G6 (Nap108 X Nap2066 (Nap2066)), G8 (Nap108 X Nap9908(
Nap9908)), G10 ( Nap205 X Nap0130 ( Nap0130)), G11 ( Nap206 X Nap205
(Nap205)), G14 (Nap2066 X Nap0130 (Nap2066)), G20 ( Nap9905 X
Nap9908 ( Nap9905)) and G29 ( Nap9906 X Nap0130 ( Nap9906)) might be
used as open pollinated verities and need to further performance and stability
test; and could be used as parents in future hybridization program.
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