Abstract:
A research was conducted by using twenty one (21) F0 populations derived from inter-varietal
crosses of lirassica rapa L. and grown in the experimental irm of Sher-c-Bangla
Agricultural University. Dhaka. during November 20!!- March 2012 to study the magnitude
of variations in characters, heritability, genetic advance, character associations, direct and
indirect efkct of different characters on seed yield. There were signilieant variations in
number of primary branches per plant. number ot secondary branches per plant, number of
silliqua per plant, days to 50% flowering, length of siliqua, number of seeds per siliqua. 1000
4
seed weight and yield per plant showed some differences between genotypic and phenotypie
variances. Plant height. length of siliqua. number of silliqua per plant, days to 50% flowering
showed low genotypic and phenotypie coefficient of variation. Plant height, number of
primary branches per plant. number of secondary branches per plant and number of silliqua
per plant showed high heritability coupled with high genetic advance and very high gene tic
advance in percentage of mean. however. length of siliqua showed low heritability.
Correlation study revealed that yield per plant had significant positive association with plant
height, number of primary branches per plant. number of siliqua per plant, seeds per siliqua,
and siliqua length (genotypic or phenotypie level). Path co-efficient analysis revealed that
plant height. number of" primary branches per plant, number of siliqua per plant. seeds per
siliqua, and siliqua length had the positive direct effect on yield per plant and days to 50%
flowering, number of secondary branches per plant, and thousand seed weight had the
negative direct effect on yield per plant. I3ased on the variability study, some F9 plants
showed high heritability Ibr short duration and yield contributing characters were selected
from some of the cross combinations of the intervarital crosses of Brassica rape: for further
selection.
Description:
A Thesis
submitted to the Faculty ofAgriculture.
Sher-e-Bangla Agricultural University, Dhaka,
in partialfulfihlment of the requirements
for the degree of
MASTER OF SCIENCE
IN
GENETICS AND PLANT BREEDING
