Abstract:
Thirty two F
5
population of Brassica napus L. were evaluated. The experiment was
laid to study the variability, correlation, path analysis and genetic diversity. The
genotypes were found significantly variable for most of the characters. Phenotypic
variances were higher than the genotypic variances for most of the character studied.
The high GCV value was observed for number of secondary branches per plant
(43.11). Number of secondary branches (98.67) exhibited the highest value of
heritability followed by seed yield per plant (98. 43) while days to maturity (88.23)
exhibited the lowest value of heritability. The significant positive correlation with
seed yield per plant were found with all most all the characters except days to 50%
flowering (0.034) and days to maturity (-0.095). Path co-efficient analysis revealed
that days to 50% flowering, number of secondary branch, number of siliqua per plant,
number of seed per siliqua, and thousand seed weight had the positive direct effect on
yield per plant whereas days to 80% maturity, plant height, number of primary branch
and siliqua length had the negative direct effect on yield per plant. On the basis of
cluster analysis, all the genotypes were classified in five clusters.The highest inter
cluster distance was observed between cluster I and IV(10.311). The lowest intercluster
distance (3.513) was observed between the cluster III and IV (3.521).
Considering group distance and other agronomic performance genotypes Nap-248 X
Nap-159, Nap-2037 X Nap-2057, Np-9908 X Np-2022, Nap-2012 X Nap-2022, Bs13
X Nap-2022
and
Bs-7
X Nap-206
might
be suggested
for
future
breeding
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
SEMESTER: January- June, 2018
