Evaluation of wheat species for heat tolerance related morpho-physiological traits
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Date
2015
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CCSHAU
Abstract
Twenty non-cultivated and cultivated genotypes belonging Triticum aestivum, Triticum durum, Triticum dicoccum and Synthetic were evaluated for Cell membrane stability (CMS), Canopy temperature (CT), SPAD chlorophyll content, Chlorophyll fluorescence, heat susceptibility index (HSI), and grain yield under normal and heat stress conditions for two years (2012-13 & 2013-14). The current study was aimed at the characterization of physiological traits in wheat species for their heat tolerance and its analysis in relation to yield components which confer yield stability at the three ploidy levels - diploid, tetraploid and hexaploid wheat species. Mean sum of squares due to years, environments, genotypes and majority of the interaction effects were significant for almost all of the traits. This suggested the variable responses of genotypes, over the environments and years for the traits under consideration with in each ploidy group for heat tolerance. Correlation coefficients revealed that CMS was the most important trait followed by CT because the genotype having high CMS also had low CT and high grain yield under heat stress. Triticum dicoccum conferred the productive and adaptive advantages as it combined high yield and stability compared to Triticum durum, Synthetic Wheat and Triticum aestivum respectively. Since wide variation for heat tolerance of physiological traits are available among the wheat species, these species can be used for improving specific yield components of cultivated wheat.
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Keywords
Biological phenomena, Diseases, Viruses, Sampling, Bacteria, PCR, Animal husbandry, Surface water, Productivity, Animal developmental stages