Abstract:
The experiment was conducted in the research field of Sher-e-Bangla Agricultural
University, Dhaka during December 2017 to April 2018 to investigate the character
association and path analysis based on morphogenic traits in onion (allium cepa l.)
genotypes in field condition. The experiment was laid out in Randomized Complete
Block Design (RCBD) with three replications. Variability, mean performance,
heritability, genetic advance, genotypic and phenotypic correlation coefficient and
path analysis on different yield contributing characters and yield of onion genotypes
were estimated. The highest bulb yield/plant (47.93 g) was recorded in the genotype of
Laltir King, whereas the lowest bulb yield/plant (6.44g) from the genotype of BARI
Piaj 2. Phenotypic coefficient of variation was higher than the genotypic coefficient of
variation for all the yield contributing traits. In case of different varieties following
highest heritability order has found; yield per bulb followed by leaf length > root
length > plant height > dry weight per bulb > bulb diameter > no. of leaf > root length
> bulb length> leaf breadth. In correlation study, yield per bulb positively and
significantly correlated with plant height (0.43 and 0.45), root length (0.59 and 0.60),
no. of leaves (0.82 and 0.72), leaf length (0.44 and 0.45), leaf breadth (0.47 and 0.48),
bulb length (0.84 and 0.78), bulb diameter (0.65 and 0.65) and dry weight per bulb
(0.98 and 0.89) at both genotypic and phenotypic levels respectively. Path coefficient
analysis revealed that plant height (1.853), no. of leaves (0.11), bulb length (0.59),
bulb diameter (0.32) and dry weight per bulb (0.21) had direct positive effect on yield
per bulb, indicating these are the main contributors to yield per bulb. The genotypes
Laltir king and Faridpuri may be selected for high yield, more dry weight of bulb,
maximum bulb length, bulb diameter, no. of leaves, leaf length and plant height.
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: January-June, 2018
