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	Metabolic Responses to Heat Stress under Elevated Atmospheric CO2 Concentration in a Cool-season Grass Species
	Xu M.
	2012
关键词	Festuca arundinacea high temperature organic acids amino acids carbohydrates chromatography-mass spectrometry temperature-stress osmotic adjustment creeping bentgrass cytokinin content carbon-dioxide drought photosynthesis acid arabidopsis
英文摘要	Heat is a major factor limiting growth of C-3 grass species. Elevated CO2 may mitigate the adverse effects of heat stress or enhance heat tolerance. The objective of this study was to determine metabolic changes associated with improvement of heat tolerance by elevated atmospheric CO2 concentration in tall fescue (Festuca arundinacea). Plants (cv. Rembrandt) were exposed to ambient day/night temperature (25/20 degrees C) or heat stress (35/30 degrees C) and ambient CO2 concentration (400 +/- 10 mu mol.mol(-1)) or double ambient CO2 concentration (800 +/- 10 mu mol.mol(-1)) in growth chambers. Turf quality (TQ), shoot growth rate, and leaf electrolyte leakage results demonstrated that heat stress at ambient CO2 concentration inhibits turf growth and reduces cell membrane stability, whereas heat-stressed plants under elevated CO2 concentration exhibit improved TQ, shoot growth rate, and membrane stability. Plants exposed to heat stress under elevated CO2 exhibited a significantly greater amount of several organic acids (shikimic acid, malonic acid, threonic acid, glyceric acid, galactaric acid, and citric acid), amino acids (serine, valine, and 5-oxoproline), and carbohydrates (sucrose and maltose) compared with heat-stressed plants at ambient CO2. The increased production or maintenance of metabolites with important biological functions such as those involved in photosynthesis, respiration, and protein metabolism could play a role in elevated CO2 mitigation of heat stress damage. Therefore, elevated CO2 conditions may contribute to improved heat stress tolerance as exhibited by better TQ and shoot growth of heat-stressed plants. Practices to harness the power of CO2 may be incorporated into turfgrass management for plant adaptation to increasing temperatures, particularly during summer months.
出处	Journal of the American Society for Horticultural Science
卷	137
期	4
页	221-228
收录类别	SCI
语种	英语
ISSN号	0003-1062
内容类型	SCI/SSCI论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/30698]
专题	地理科学与资源研究所_历年回溯文献
推荐引用方式 GB/T 7714	Xu M.. Metabolic Responses to Heat Stress under Elevated Atmospheric CO2 Concentration in a Cool-season Grass Species. 2012.

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