Abstract:
The experiment was conducted with 29 genotypes of rice at the experimental farm of
Sher-e-Bangla Agricultural University, Dhaka during the period of December, 2013 to
May, 2014 to estimate the variability and interrelationship between yield and yield
contributing characters and their direct and indirect effect on yield. The experiment was
laid out in Randomized Complete Block Design with three replications. All the genotypes
varied significantly from each other for all the studied characters which indicate the
presence of considerable variations among the genotypes. The PCV values were higher
than the respective GCV values for all the characters under study. Plant height, total
spikelet per panicle, number of filled grains per panicle and number of unfilled grains per
panicle showed high genotypic and phenotypic coefficient of variation. These characters
also showed high heritability coupled with high genetic advance and very high genetic
advance in percentage of mean which is normally more helpful in predicting the genetic
gain under selection. Correlation co-efficient analysis revealed that yield per hectare had
significant positive association with panicle length, number of secondary branches per
panicle, total number of spikelet per panicle, number of filled grains per panicle and yield
per plant. Path coefficient analysis revealed that number of filled grains per panicle
showed the highest positive direct effect on yield per hectare followed by panicle length,
number of secondary branches per panicle and yield per plant. Considering variability,
heritability, genetic advance, correlation co-efficient and path analysis, number of filled
grain per panicle showed high heritability, genetic advance, high significant positive
correlation and the highest positive direct effect on yield per hectare.
Description:
A Thesis
submitted to the Faculty of Agriculture,
Sher-e-Bangla Agricultural University, Dhaka,
in partial fulfilment of the requirements
for the degree of
MASTER OF SCIENCE
IN
GENETICS AND PLANT BREEDING