Abstract:
The experiment was conducted using 38 promising genotypes of Brassica napus L.
during November 2019 to March 2020 at the experimental field of Sher-e Bangla
Agricultural University, Dhaka. The study focused on correlation between eleven
yield-contributing traits, direct and indirect impacts of several characters on yield per
plant, heritability, genetic advance in order to evaluate genotypes. Significant
differences were found for all of the variables after doing a variance analysis. Days to
first flowering, number of primary branches per plant, number of secondary branches
per plant, siliqua length (cm), seeds per siliquae, thousand seeds weight (g), and seeds
yield per plant all showed the smallest difference between phenotypic and genotypic
variation. The number of primary branches per plant, number of secondary branches
per plant, number of siliqua per plant, and yield per plant all showed substantial
genotypic and phenotypic coefficient of variation . The number of secondary
branches per plant had the highest genotypic co-efficient of variation (42.39) and
phenotypic co-efficient of variation (46.93). In number of siliqua per plant, high
heritability (68.91) was combined with high genetic advance (55.72), indicating that
this quality was under additive gene action and that selection for genetic improvement
would be effective. In terms of correlation, the number of secondary branch per plant,
siliqua length (cm), seeds per siliqua, and thousand seeds weight (cm) all had positive
significant genotypic and phenotypic correlations with yield per plant. Days to 50%
flowering (0.236), days to maturity (0.396), plant height (0.552), number of siliquae
per plant (0.113), siliqua length (0.474), and seeds per siliquae (2.256) all had a
positive and direct effect on yield per plant, indicating that they were the most
important contributors to seed yield per plant. The path coefficient analysis was
carried out using the correlation coefficient to determine direct and indirect influence.
The most promising genotypes for a future research program were chosen after taking
into account the genetic parameter, other agronomic characteristics, and the
achievement of the objectives. These genotypes were G8, G9, G18, G21, and G14.
