Abstract:
The experiment was conducted during the period from November 2013 to April
2014 in rabi season in the experimental fietti of Sher-e-llangla Agricultural
University. Sher-e-Bangla Nagar, Dhaka to unravel the role of morphophysiological
characters in spring wheat tinder drought stress. In this experiment
30 wheat genotypes were used as experimental materials. The experiment was
laid out in Randomized Complete Block Design (RCBD) with three replications.
During the experimental period no irrigation was provided for creating drought
environment. Mean performance, variability, correlation matrix and path
analysis were estimated on different yield contributing characters and yield of
wheat genotypes. The longest plant (84.00 cm) was recorded in genotype
Sonalika, while the shortest plant (53.33 cm) in the wheat genotype BD-489. The
highest grain yield per plant (9.02 g) was recorded in Sonalika, while the lowest
(5.24 g) in 130-489. Phenotypic coefficient of variation was higher than the
genotypic coefficient of variation for all the yield contributing traits. In
a correlation study, significant negative association was recorded for grain yield
per plant of wheat genotypes with days to starting of heading (-0.265), days to
starting of maturity (-0.267) and root number (-0.343), while the non significant
negative association for number of grains/spike (-0.183), chlorophyll content (-
0.097), dry matter content (-0.003) and root length (-0.058). On the other hand.
significant positive association was recorded for grain yield per plant "vith plant
height (0.688), number of spike/rn2 (0.269), number of spikelts/spike (0.630),
peduncle length (0.640) and weight of 1000 grains (0.201), while non significant
positive association was obsenred with leaf area index (0.007). Path analysis
revealed that (lays to staring of heading, plant height, number of spike/rn2,
number of spikeklets/spike, number of grains/spike, dry matter content, peduncle
length and weight of 1000 grains had positive direct effect on yield per plant, on
the other hand, days to starting of maturity, chlorophyll content, leaf area index,
root length and root number had negative direct effect on yield per plant. In
consideration of yield contributing characters and yield Sonalika performed
better under drought condition followed by 80-7617. SARI (Jom-25, SARI
Gom-23 and BD-7650.
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, 2014
