Abstract:
A research was conducted by using eight F2& eight F4 populations generated
through inter-varietal crosses, along with three check varity of Brassica rapa and
grown in the experimental farm of Sher-c-Bangla Agricultural Unriversity. Dhaka,
during November 2009-March 20010 to study the variation in different characters,
correlation between pairs of different characters and the direct and indirect effect
of different characters on seed yield per plant of the F2 & F4 materials to select the
plants with higher potential. From the values of mean, range and CV (%) of seed
yield and yield contributing characters it was confirmed that there were
considerable variation present among all the genotypes used in the experiment. It
was shown that more seggregation present in P2 material than F4 material. The
values of phenotypic variances were higher than the corresponding genotypic
variances. I)ays to 50% flowering, days to maturity, number of primary branches
per plant, number of secondary branches per plant, length of siliqua, number of
seeds per siliqua. thousand seed weight and yield per plant showed least difference
between phenotypic and genotypic variances. The values of GCV and PCV
indicated that there was least variation present among most of the characters. The
days to maturity, length of siliqua, seeds per siliqua, thousand seed weight showed
high heritability with low genetic advance and genetic advance in percentage of
mean. Yield per plant had significant and highest positive correlation with length
of siliqua, seeds per siliqua and thousand seed weight. The path co-efficient
analysis revealed that siliquae per plant had the highest positive direct eRect
followed by number of secondary branches per plant, days to 50% flowering,
length of siliqua, and plant height. Sixteen most promising plants with short
duration and higher yield were selected from eight crosses of the F2 populations of
Brassica rapa & forteen most promising plants with short duration and higher
yield were selected from eight crosses of the F4 populations
Description:
A Thesis
Submitted to the Faculty of Agriculture,
Sher-e-Bangla Agricultural University, Dhaka- 1207
In partial flulfiliment of the requirements
for the degree of
MASTER OF SCIENCE r IN
GENETICS AND PLANT BREEDING
SEMESTER: JANUARY - JUNE, 2010
