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• W235904073 abstract "High temperatures (>35oC) are common throughout the cotton-growing season in many regions and may adversely affect the growth and development potential of the crop, ultimately limiting yield. Development of stress screening techniques will enable selection of heat tolerant genotypes for incorporation into future breeding programs. This study assessed the use of the membrane integrity and enzyme viability assays as biochemical screening techniques for determination of genotypic difference in heat tolerance under field conditions. These biochemical screens were evaluated as part of a multi-level approach assessing morphological, physiological, biochemical and molecular determinants of heat tolerance in response to evaluated temperatures. High yielding Australian cotton cultivars of known and differing yield performance in hot environments were evaluated to ascertain whether biochemical screens could be employed to detect differences in their heat tolerance. Cultivar Sicot 53 was selected as a relatively thermotolerance genotype whilst Sicala 45 was selected as a cultivar with relatively lower heat tolerance. To simulate elevated temperature in the field, clear plastic tents were constructed above the cotton crops in Narrabri, Australia and College Station, USA to determine whether a field based high temperature stress improved the resolution of biochemical screens for heat tolerance and whether differences detected translated to physiological performance. This study revealed that field-based elevated air temperatures were not sufficient to resolve cultivar differences in cell membrane integrity or enzyme viability under ambient field conditions across the three cotton-growing seasons. However, exposure of leaf tissue to high air temperature using tents resulted in a genotype specific response to heat stress. Implementation of tents increased the resolution of the membrane integrity assay and changed the response of enzyme viability for cultivars Sicot 53 and Sicala 45. Cultivar differences for membrane integrity (P=0.007) and enzyme viability (P<0.001) were consistent in explaining differences for photosynthesis (P=0.046), electron transport rate (P=0.057) and stomatal conductance (P=0.036) which reflected previously determined differences in yield. This highlighted the potential for development of rapid biochemical screening methods for heat tolerance to be used in combination with a multi-level approach also incorporating morphological, physiological and molecular performance indicators to ensure that genotypes selected would contribute to improvements in economic yield." @default.
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• W235904073 date "2011-01-01" @default.
• W235904073 modified "2023-10-09" @default.
• W235904073 title "Multi-level determination for heat tolerance of cotton cultivars." @default.
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