Abstract
Global warming could possibly increase the air temperature by 1.8–4.0 °C in the coming decade. Cotton fiber is an essential raw material for the textile industry. Fiber length, which was found negatively related to the excessively high temperature, determines yarn quality to a great extent. To investigate the effects of global warming on cotton fiber length and its mechaism, cottons grown in artificially elevated temperature (34.6/30.5 °C, Tday/Tnight) and ambient temperature (31.6/27.3 °C) regions have been investigated. Becaused of the high sensitivities of enzymes V-ATPase, PEPC, and genes GhXTH1 and GhXTH2 during fiber elongation when responding to high temperature stress, the fiber rapid elongation duration (FRED) has been shortened, which led to a significant suppression on final fiber length. Through comprehensive analysis, Tnight had a great influence on fiber elongation, which means Tn could be deemed as an ideal index for forecasting the degree of high temperature stress would happen to cotton fiber property in future. Therefore, we speculate the global warming would bring unfavorable effects on cotton fiber length, which needs to take actions in advance for minimizing the loss in cotton production.
Highlights
Cell turgor, the main driving force for cotton fiber elongation[16], was generated by the accumulation of osmotically active solutes[17], which mainly includes malate, K+ and soluble sugars[18]
We aimed to explore an improved understanding of the thermo stabilities from these cotton cultivars, and characterize the responses of the key enzymes and genes related to cotton fiber elongation under artificially elevated temperature, for sustaining our result in physiological terms
The air temperature >32 °C caused by global warming would certainly pose a challenge to cotton production in the future[35]
Summary
The main driving force for cotton fiber elongation[16], was generated by the accumulation of osmotically active solutes[17], which mainly includes malate, K+ and soluble sugars[18]. Sucrose synthase (SuSy, EC 2.4.1.13) and invertase (INV, EC 3.2.1.26) are the two key enzymes responsible for sucrose cleavage into hexoses[23], the main existing form of soluble sugar in cotton fiber[20]. Fiber length is limited by the cell wall relaxation process[25, 26], which is related to some enzymes expression and activities. We aimed to explore an improved understanding of the thermo stabilities from these cotton cultivars, and characterize the responses of the key enzymes and genes related to cotton fiber elongation under artificially elevated temperature, for sustaining our result in physiological terms
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