Abstract:
The experiment was conducted with ten genotypes and two check varieties of rice at the
experimental farm of Sher-e-Bangla Agricultural University, Dhaka during the period of
April 2015 to September 2015 to estimate the comparative trial and to select high
yielding and short duration genotypes of rice (Oryza sativa L.) and also to find out the
genotypes which have potential traits for using in further breeding programs as parent
materials. The experiment was conducted using Randomized Complete Block Design
with three replications. All the genotypes compared significantly with each other and also
with two check varieties for all the studying characters indicated the presence of
considerably variations among the genotypes studied. Comparatively phenotypic
variances were higher than the genotypic variances and also the PCV values were higher
than the respective GCV values for all the characters under study. Highest phenotypic
and genotypic variances were showed in plant height (127.32%), total no of spikelet per
panicle (803.16%), number of filled grain per panicle (594.19%). On the other hand, the
significant positive correlation with seed yield per hectare was found in days to flowering
(G= 0.918, P= 0.706), days to maturity (G= 0.835, P= 0.637), plant height (G= 0.628, P=
0.550), number of primary branches per panicle (G= 0.866, P= 0.692), number of
secondary branches per panicle (G= 0.834, P= 0.667), total no of spikelet per panicle (G=
0.648, P= 0.465), number of filled grain (G= 0.754, P= 0.552), yield per plant (G= 0.806,
P= 0.631). Path co-efficient analysis revealed that number of effective tiller per plant
(0.847), panicle length (0.080), number of secondary branches per panicle (0.430),
number of filled grain (0.747) and yield per plant (0.858) had the positive direct effect on
yield per hectare. The residual effect was found 0.020. This effect indicates that 98% of
the variability was accounted for fourteen yield and yield contributing traits in the present
studies. Comparing with the check varieties G11(4.49 t) and G12 (3.64 t), the genotype
G4 showed higher seed yield per plant (31.47) and yield per hectare (5.28) but duration
was long (131 days). On the other hand G3 showed higher seed yield per plant (25.07)
and yield per hectare (3.773) and also the duration is short than one check variety G12.
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, 2016
