| dc.description.abstract | An experiment was conducted at the Research farm and laboratory of Crop
Physiology and Ecology Department, Hajee Mohammad Danesh Science and
Technology University, Dinajpur during November 2011 to April 2012 to
examine the effect of late sowing heat stress on performance of some wheat
genotypes. The experiment was laid out in split plot design with three replications.
Two sowing dates (November 30 and December 30) were considered as main plot
treatments and four wheat genotypes (BAW 1051, BARI Gom 26, Bulbul and
BARI Gom 25) were considered as sub plot treatments. BAW 1051, BARI Gom
26 and BARI Gom 25 provided greater maximum ear dry weight and longer grain
growth duration under heat stress compared to Bulbul. In addition, these three
wheat genotypes (BAW 1051, BARI Gom 26 and BARI Gom 25) showed greater
ability to retain flag leaf chlorophyll, accumulate greater amount of proline in
both flag leaf and kernel along with keep the canopy cooler compared to Bulbul.
Late sowing induced ‘heat stress significantly reduced ears m”, grains ear’,
spikelets ear’, 1000-seed weight, grain yield and straw yield but greater reduction
of these parameters was found in Bulbul than the other genotypes e.g. in BAW
1051, BARI Gom-26 and BARI Gom-25. Finally, based on heat susceptibility
index for grain yield, and praline content in both flag leaf and kernel Bulbul was
most susceptible genotype and BARI Gom-26 was found as the most tolerant in
view of praline accumulation in leaf and kernel. | en_US |
