| dc.description | The cultivated mustard (Brassica Sp L.) is an ancient crop of the new
world which is originated in Asia, Europe and perhaps Africa, where it is
cultivated in 1200 B.C. With the Multiplicity of forms that are grown it is quite
probable that there were several separate areas of origin. Rapeseed and
mustard are extensively cultivated in Asia, Japan and western Europe. It is the
forth most important edible source in the world after soybean and palm.
Canada is the largest producer in mustard seed production in the world, and
accounts for about 97% of world exports (Man and Weir, 2008-2009) | en_US |
| dc.description.abstract | The field experiment was conducted with 25 mustard (Brassica sp.) genotypes at the farm
division field of Hajee Mohammad Danesh Science and Technology University, Dinajpur
during November-2010 to Februry-2010 to study variability and genetic diversity present
among 25 mustard genotypes (Brassica sp.). Eleven quantitative characters viz. plant
height, days to 50% flowering, days to maturity, number of primary branches per plant,
number of secondary branches per plant, number of siliqua/plant, diameter of siliqua,
length of siliqua, number of seed per pod, 100 seed weight and yield per plant were taken
into consideration. The analysis of variance revealed remarkable variability among the
genotypes for the characters concerned. The magnitudes of phenotypic coefficient of
variations were higher than corresponding genotypic coefficients of variation. Higher
genotypic as well as phenotypic coefficient of variations were computed for number of
secondary branches per plant, number of siliqua /plant, number of primary branches per
plant and yield per plant. Heritability estimates were higher for all the characters except
number of secondary branches/plant. High heritabilities coupled with high magnitude of
genetic advances were estimated for secondary branches per plant, number of siliqua
/plant, number of primary branches per plant and yield per plant. Cluster analysis was
used for grouping of 25 mustard (Brassica sp.) and the genotypes were belonging to six
clusters. Cluster IT had maximum (13) and cluster IV, V and VI had the minimum number
(2) of genotypes. The highest inter-cluster distance was observed between cluster I and IV
and the lowest between cluster V and VI. Cluster II (D=4.91) have highest intra-cluster
distance where lowest in cluster II (5.607). The characters plant height and number of
secondary branches per plant, number of siliqua/plant had maximum contribution towards
divergence among the mustard genotypes. Considering variability and diversity analysis,
the genotypes, BARI-11, BARI-12, BARI-9 from cluster III for higher yield, early flowering
and fruit maturity; the genotypes DAULAT and BARI-14 from cluster IV for higher number
of siliqua/plant, number of secondary branches/ plant, yield/ plant might be considered as
better parents for future hybridization program. | en_US |
