Journal
FUNCTIONAL PLANT BIOLOGY
Volume 41, Issue 1, Pages 56-67Publisher
CSIRO PUBLISHING
DOI: 10.1071/FP13140
Keywords
electron transport; heat stress; membrane integrity; microarray; Rubisco; quantitative real-time polymerase chain reaction
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Funding
- CSIRO
- Cotton Catchment Communities Co-operative Research Corporation
- Australian Cotton Research and Development Corporation
- Cotton Breeding Australia
- Australian Postgraduate Award
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Diurnal or prolonged exposure to air temperatures above the thermal optimum for a plant can impair physiological performance and reduce crop yields. This study investigated the molecular response to heat stress of two high-yielding cotton (Gossypium hirsutum L.) cultivars with contrasting heat tolerance. Using global gene profiling, 575 of 21854 genes assayed were affected by heat stress,similar to 60% of which were induced. Genes encoding heat shock proteins, transcription factors and protein cleavage enzymes were induced, whereas genes encoding proteins associated with electron flow, photosynthesis, glycolysis, cell wall synthesis and secondary metabolism were generally repressed under heat stress. Cultivar differences for the expression profiles of a subset of heat-responsive genes analysed using quantitative PCR over a 7-h heat stress period were associated with expression level changes rather than the presence or absence of transcripts. Expression differences reflected previously determined differences for yield, photosynthesis, electron transport rate, quenching, membrane integrity and enzyme viability under growth cabinet and field-generated heat stress, and may explain cultivar differences in leaf-level heat tolerance. This study provides a platform for understanding the molecular changes associated with the physiological performance and heat tolerance of cotton cultivars that may aid breeding for improved performance in warm and hot field environments.
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