| dc.description.abstract | The present study was conducted at Crop Physiology and
Ecology Laboratory and research field, Hajee Mohammad
Danesh Science and Technology University (HSTU), Dinajpur
during November 29, 2015 to March 24, 2016 to study on
morpho-physiological traits, yield and water-use efficiency of
wheat under water stress condition. Three experiments were
carried out under this study. The experiments were laid out in
completely randomized design with three replications. Speed of
germination as expressed by rate of germination, co-efficient of
germination and germination vigor index of all wheat genotypes
was delayed under polyethylene glycol (PEG) induced water
stress as compared to control. Shoot length, root length, shoot
to root ratio, shoot dry weight, root dry weight and seed
metabolic efficiency of 5 days old seedlings were found to be
reduced due to water stress. But the degree of reduction of
these parameters in relation to water stress was not similar for
all wheat genotypes. Based on relative injury (%) wheat
genotypes BAW-1177 and BARI Gom-29 were considered as
drought tolerant whereas, ESWYT-29 considered as drought
susceptible and BARI Gom-28 was moderately drought tolerant.
Drought tolerant wheat genotypes showed greater ability to
retain water in leaf, greater stability of flag leaf chlorophyll,
greater ability to keep the canopy cooler and higher level of
proline in flag leaf compared to sensitive genotype under water
stress condition. Plant height, spike length, spike plant-1,
spikelet number spike-1, grains spike-1 grains spikelet-1, grain
weight spike-1 and 100-seed weight were higher in drought
tolerant genotypes compared to drought sensitive genotype at
both well-watered and water stress conditions. At well-watered
and water stress conditions, BAW-1177 attained the highest
shoot biomass and seed yield plant-1 followed by BARI Gom-28
and BARI Gom-29 whereas, ESWYT-29 had the lowest biomass
and seed yield. Drought reduced the HI for BARI Gom-28 and
ESWYT-29 but it increased for BAW-1177 and BARI Gom-29 compared to well-watered condition. In water-use efficiency at
seed yield level and biomass level all the genotypes showed
slight increment under drought condition compared to wellwatered condition. Therefore, BAW-1177 had the highest wateruse efficiency and ESWYT-29 had the lowest water-use
efficiency at both well-watered and water stress conditions. The
order of drought tolerance based on above ground biological
yield and grain yield was BAW 1177 > BARI Gom-29 > BARI
Gom-28 > ESWYT-29 | en_US |
