The investigation was carried out in focusing the genetic variability for different traits of wheat influenced by heat tolerance mechanism to find out relationships among phenological, physiological and yield contribu...The investigation was carried out in focusing the genetic variability for different traits of wheat influenced by heat tolerance mechanism to find out relationships among phenological, physiological and yield contributing traits. Spring wheat cultivar of 25 genotypes were selected and cultivated under late sowing condition at the Regional Wheat Research Institute, Shympur, Rajshahi, Bangladesh from December, 2016 to April, 2017. Significant variability among the genotypes exposed for different traits related to heat tolerance. Results showed that the genotypes G24, G10, G01, G13, G16, G25 and G14 </span><span style="font-family:Verdana;">ranked as better category considering maximum number of traits in mean</span><span style="font-family:Verdana;"> performance indicating their tolerance to heat stress under late sowing condition. Phenotypic variances (<i>σ<sub>g</sub><sup style="margin-left:-6px;">2</sup></i>) of all traits were greater than those of genotypic variances (<i>σ<sub>g</sub><sup style="margin-left:-6px;">2</sup></i>). The same trends were also found in their co-efficient of variances. The phenotypic co-efficient of variances (PCV) of all traits were greater compare to those of genotypic co-efficient of variances (GCV) and their values were closer to each other. The heading days (HD), canopy temperature at vegetative stage (CT</span><sub><span style="font-family:Verdana;">vg</span></sub><span style="font-family:Verdana;">), canopy temperature at grain filling stage </span><span><span style="font-family:Verdana;">(CT</span><sub><span style="font-family:Verdana;">gf</span></sub><span style="font-family:Verdana;">), biomass, plant height (PH), spike/m</span><sup><span style="font-family:Verdana;">2</span></sup><span style="font-family:Verdana;"> (SPM), spikelet/spike (SPS), </span></span><span style="font-family:Verdana;">grain/</span></span><span style="font-family:""> </span><span style="font-family:Verdana;">spike (GPS), thousand grain weight (TGW) and yield exhibited higher heritability (展开更多
文摘The investigation was carried out in focusing the genetic variability for different traits of wheat influenced by heat tolerance mechanism to find out relationships among phenological, physiological and yield contributing traits. Spring wheat cultivar of 25 genotypes were selected and cultivated under late sowing condition at the Regional Wheat Research Institute, Shympur, Rajshahi, Bangladesh from December, 2016 to April, 2017. Significant variability among the genotypes exposed for different traits related to heat tolerance. Results showed that the genotypes G24, G10, G01, G13, G16, G25 and G14 </span><span style="font-family:Verdana;">ranked as better category considering maximum number of traits in mean</span><span style="font-family:Verdana;"> performance indicating their tolerance to heat stress under late sowing condition. Phenotypic variances (<i>σ<sub>g</sub><sup style="margin-left:-6px;">2</sup></i>) of all traits were greater than those of genotypic variances (<i>σ<sub>g</sub><sup style="margin-left:-6px;">2</sup></i>). The same trends were also found in their co-efficient of variances. The phenotypic co-efficient of variances (PCV) of all traits were greater compare to those of genotypic co-efficient of variances (GCV) and their values were closer to each other. The heading days (HD), canopy temperature at vegetative stage (CT</span><sub><span style="font-family:Verdana;">vg</span></sub><span style="font-family:Verdana;">), canopy temperature at grain filling stage </span><span><span style="font-family:Verdana;">(CT</span><sub><span style="font-family:Verdana;">gf</span></sub><span style="font-family:Verdana;">), biomass, plant height (PH), spike/m</span><sup><span style="font-family:Verdana;">2</span></sup><span style="font-family:Verdana;"> (SPM), spikelet/spike (SPS), </span></span><span style="font-family:Verdana;">grain/</span></span><span style="font-family:""> </span><span style="font-family:Verdana;">spike (GPS), thousand grain weight (TGW) and yield exhibited higher heritability (
