Abstract:
The present research was
carried out to determine the best selection
criteria for yield improvement in rapeseed
(Brassica napus L.). Nine genotypes of
Brassica napus were sown at Oilseeds
Research Institute, Faisalabad, during the
years 2011- 2012, to evaluate the means and
components of variability (genotypic and
phenotypic), heritability (h2
B.S), correlation
(genotypic and phenotypic) and path
analysis for yield and various yield
components. At phenotypic and genotypic
level, seed yield/plant had significant
positive correlation with plant height,
seeds/plant and siliqua/plant. A positive and
highly significant genetic relationship was
found between plant height and seeds/plant,
siliqua length and seeds/siliqua, days to
maturity and 1000 seed weight, days to
flowering and seeds/plant, days to maturity
and seeds/plant. Path coefficient revealed
that the seeds/siliqua, 1000 seed weight,
days to flowering, days to maturity and
seeds/plant had direct positive contribution
towards seed yield per plant. For rapeseed
breeding seed per plant was the variable
with maximum potential of selection for
seed yield improvement because this trait
possessed high h2
B.S, highly significant
positive correlation and maximum positive
direct effects with yield.
