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- W821014167 abstract "Heat stress affects at least 5 million ha of spring wheat in the developing world and over 7 million ha are grown in continual heat stress, with mean daily temperatures of greater than 17.5°c in the coolest month (Fischer and Byerlee, 1991). The demand for wheat is expected to grow by approximately 1.6 percent per year worldwide and by 2 percent per year in developing countries by the year 2020. This implies an urgent need for refinement of new and more efficient wheat breeding methodologies to identify new traits, particularly physiological traits, optimization of phasic development with respect to raising yield potential and to complement existing breeding techniques for warmer heat growing regions worldwide. The most important step is to recombine elite genotypes, introgression of genetically diverse DNA to incorporate Vrn, Ppd, and Eps genes, increase partitioning of photo-assimilates, translocation from stem to grain of soluble carbohydrates (stem reserve), ability to maintain green leaf area duration (stay green) and to improve radiation use efficiency throughout the grain filling period. Measurements of membrane thermo-stability and chlorophyll fluorescence in parents and F1’s of six crosses at postanthesis stage during 2006-07 were recorded. Acquired thermo-tolerance showed significant variation in late sown conditions for parents and Fl’s. It was inferred that genotype PBW 435 and the cross PBW 343 x PBW 435 conferred less relative injury and greater thermotolerance possibly through maintaining cellular membrane integrity under high temperature stress. Data based on chlorophyll fluorescence revealed a reduction of mean value of all genotypes and their F1’s for Fv/m, variable fluorescence in late sown conditions. The genotypes and Fl’s showed high Fv/m values under both environments and displayed good tolerance to high temperature." @default.
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- W821014167 date "2008-01-01" @default.
- W821014167 modified "2023-09-27" @default.
- W821014167 title "Efficiency of stress-adaptive traits chlorophyll fluorescence and membrane thermo- stability in wheat under high temperature" @default.
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