Abstract:
An experiment was carried out with 24 genotypes including 4 check varieties of the species
Brassica rapa L. in the experimental farm, Sher-e-Bangla Agricultural University (SAU),
Dhaka during November, 2013-March, 2014 for estimating the magnitude of variations in
characters, heritability, genetic advance, character associations, direct and indirect effect
of different characters on seed yield per plant. The phenotypic variances were higher than
the genotypic variances. Significant variation was observed among all the genotypes for
all the characters studied. Days to 50% flowering, days to 80% maturity showed moderate
difference between the phenotypic and genotypic variance whereas minimum differences
were found in number of primary branches per plant, number of secondary branches/plant,
number of seeds per siliqua, siliqua length and thousand seed weight and yield per plant.
Number of secondary branches per plant showed high heritability coupled with high
genetic advance in percentage of mean. On the other hand days to 50% flowering, no. of
siliqua per plant, yield per plant showed high heritability with moderate genetic advance
in percentage of mean. Days to 80% maturity, no. of primary branches per plant, no. of
seed per siliqua showed high heritability coupled with low genetic advance in percentage
of mean. The significant positive correlation with seed yield per plant were found in
thousand seed weight, no. of siliqua per plant, no. of primary branches per plant. Path coefficient
analysis revealed that plant height, no. of primary branches per plant, no. of siliqua
per plant, siliqua length, thousand seed weight showed positive direct effect with yield per
plant. Days to 50% flowering, days to 80% maturity, no. of secondary branches per plant,
no of seed per siliqua showed negative direct effect on yield per plant. Beside these days
to 50% flowering, days to 80% maturity, no. of secondary branches per plant, no of seed
per siliqua showed negative direct effect on yield per plant. Considering all the
characters related to yield and early maturity the two advanced lines G3 and G17
have the potentiality toward the development of improved variety that might be a
trademark in Brassica rapa L. It may be concluded that a scope relies for further
work with G1 (SAUSR-03) that was the earliest matured line with moderate yield.
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: July-December, 2014