Estimation of Variability, Heritability and Genetic Advance for Phenological, Physiological and Yield Contributing Attributes in Wheat Genotypes under Heat Stress Condition — Oak Academic Publishing
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Estimation of Variability, Heritability and Genetic Advance for Phenological, Physiological and Yield Contributing Attributes in Wheat Genotypes under Heat Stress Condition
Department of Crop Science and Technology, Faculty of Agriculture, Rajshahi University, Rajshahi, Bangladesh
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Department of Crop Science and Technology, Faculty of Agriculture, Rajshahi University, Rajshahi, Bangladesh
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Department of Agronomy and Agricultural Extension, Faculty of Agriculture, Rajshahi University, Rajshahi, Bangladesh
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Cooperative Extension and Research, Lincoln University of Missouri, Jefferson City, MO, USA
1 Department of Crop Science and Technology, Faculty of Agriculture, Rajshahi University, Rajshahi, Bangladesh
2 Department of Crop Science and Technology, Faculty of Agriculture, Rajshahi University, Rajshahi, Bangladesh
3 Department of Agronomy and Agricultural Extension, Faculty of Agriculture, Rajshahi University, Rajshahi, Bangladesh
4 Cooperative Extension and Research, Lincoln University of Missouri, Jefferson City, MO, USA
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 ranked as better category considering maximum number of traits in mean 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 vg ), canopy temperature at grain filling stage (CT gf ), biomass, plant height (PH), spike/m 2 (SPM), spikelet/spike (SPS), grain/ spike (GPS), thousand grain weight (TGW) and yield exhibited higher heritability (<i> h<sub>b</sub><sup style="margin-left:-6px;">2</sup> </i>) estimated under irrigated late sowing (ILS) condition. Under the same ILS condition SPAD, SPM, SPS, GPS, TGW and yield showed moderate to high genetic advance (GA) obtained through computing their mean percentage (%) and the rest traits HD, maturity days (MD), CT vg , CT gf , biomass, PH and harvest index (HI) exposed smaller genetic advance (% mean). The co-efficient of variation (CV%) of all attributes in all genotypes were significantly lower (1.36 - 6.96). Both heritability and genetic advance were found lower for MD, SPAD and HI indicated their non additive genetic effects for which these traits might not be recommended for selection. However, spike/m 2 , spikelet/spike, grain/spike, thousand grain weight and yield belonged to higher heritability and high to moderate genetic advance in mean percentage (%) along with wide genetic variation and lower environmental influence in heat stress situation indicated the most likely heritability due to the effects of additive genes that might be suggested as effective process of selection for these traits in heat stress condition.
KeywordsWheat GenotypeVariability
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Heritability
Genetic Advance
PCV (Phenotypic Co-Efficient of Variation)
GCV (Genotypic Co-Efficient of Variation)
Heat Tolerance
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