Abstract:
A research was conducted by using twenty F3 and F4 populations generated through
inter-varietal crosses, along with three check variety of Brassica rapa L and grown in
the experimental farm of Sher-e-Bangla Agricultural University, Dhaka, during
November 2013 to February 2014 to study the variation in different characters,
correlation between pairs of different characters and the direct and indirect effect of
good yielding plants of the F3 and F4 material to select high yielding and early mature
plants. Considering genetic parameters, comparatively phenotypic variances were
higher than the genotypic variances for all the characters studied. Days to maturity,
number of primary branches per plant, length of siliqua, thousand seed weight showed
least difference between genotypic and phenotypic variance. High phenotypic and
genotypic co-efficient of variation were found on number of secondary branches per
plant, number of siliqua per plant and yield per plant. Thousand seed weight and
yield per plant showed high heritability with low genetic advance and high genetic
advance in percentage of mean. Yield per plant had significant and the positive
correlation with plant height, number of primary branches per plant number of
secondary branches per plant, number of siliqua per plant and thousand seed weight.
The path co-efficient analysis revealed that plant height had the highest positive direct
effect followed by siliquae per plant, number of seed per siliqua, number of secondary
branches per plant. Twenty one most promising plants with short duration and higher
yield were selected from different five crosses of the F3 and F4 populations of
Brassica rapa L.
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
SEMESTER: JULY-DECEMBER, 2014
