Abstract:
An experiment was carried out with 58 genotypes of Brassica rapo including three
commercially cultivated varieties as check to study their intergenotypic variability.
eon-elation, path co-efficient analysis and genetic divergence considering 10 different
morphological characters at the experimental farm of SAl!. l)haka during November
2007 to March 2008. Significant variation was observed among all the genotypes for all
the characters studied except thousand seed weight. High CICV value was observed for
number of secondary branches per plant. High heritability values along itli high genetic
advance in percentage of mean were obtained for days to 50% flowering. number of
secondary branches per plant, seeds per siliqua. and siliqua length. Highly significant
positive association of seed yield per plant was observed with number of primary
branches per plant, number of secondary branches per plant. number of siliquae per plant.
Path analysis showed that, yield per plant had the highest direct effect on flumL)Cr of
primary branches per plant, number of siliquac per plant, number of secondary branches
per plant and number of seeds per siliqua. By using different multivariate analysis
techniques all the genotypes were grouped into 6 clusters. PCA. PCO and ('V.A analysis
gave almost similar result. Cluster II and III had maximum (13) and cluster IV had
minimum (6) number of genotypes. The highest inter cluster distance was observed
between cluster Ill and Vi and the lowest between cluster 11 and IV. highest intra-cluster
distance was observed in cluster VI. Plant height, number of secondary branches per
plant and seeds per siliqua contributed maximum towards divergence. Considering
diversity pattern, genetic status and other agronomic performances. line 39 and line 44
from cluster I; line 42 from cluster H; line 2, line 43 and line 45 from cluster V: line 50.
Line 52, line 54 and line 58 from cluster VI- might he selected as suitable parents in future
hybridization program.
Description:
A Thesis
Submitted to the Faculty of Agriculture,
Sher-e-Bangla Agricultural Univcrsity. Dhaka,
in partial flulliliment of the requirements
for the degree of
MASTER OF SCIENCE
IN
GENETICS AND PLANT BREEDING
SEMESTER: JANUARY-JUNE' 2008
