气候变化领域集成服务门户(CCPortal): Schizachyrium scoparium (C4) better tolerates drought than Andropogon gerardii (C4) via constant CO2 supply for photosynthesis during water stress

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DOI	10.1093/aobpla/plae012
	Schizachyrium scoparium (C4) better tolerates drought than Andropogon gerardii (C4) via constant CO2 supply for photosynthesis during water stress
	Dekirmenjian, Alina; Montano, Diego; Budny, Michelle L.; Lemoine, Nathan P.
发表日期	2024
ISSN	2041-2851
起始页码	16
结束页码	2
卷号	16 期号:2
英文摘要	Climate change is dramatically altering global precipitation patterns across terrestrial ecosystems, making it critically important that we understand both how and why plant species vary in their drought sensitivities. Andropogon gerardii and Schizachyrium scoparium, both C-4 grasses, provide a model system for understanding the physiological mechanisms that determine how species of a single functional type can differ in drought responses, an issue remains a critical gap in our ability to model and predict the impacts of drought on grassland ecosystems. Despite its greater lability of foliar water content, previous experiments have demonstrated that S. scoparium maintains higher photosynthetic capacity during droughts. It is therefore likely that the ability of S. scoparium to withstand drought instead derives from a greater metabolic resistance to drought. Here, we tested the following hypotheses: (H1) A. gerardii is more vulnerable to drought than S. scoparium at both the population and organismal levels, (H2) A. gerardii is less stomatally flexible than S. scoparium, and (H3) A. gerardii is more metabolically limited than S. scoparium. Our results indicate that it is actually stomatal limitations of CO2 supply that limit A. gerardii photosynthesis during drought. Schizachyrium scoparium was more drought-resistant than A. gerardii based on long-term field data, organismal biomass production and physiological gas exchange measurements. While both S. scoparium and A. gerardii avoided metabolic limitation of photosynthesis, CO2 supply of A. gerardii was greatly reduced during late-stage drought stress. That two common, co-occurring C-4 species possess such different responses to drought highlights the physiological variability inherent within plant functional groups and underscores the need for more studies of C-4 drought tolerance.
英文关键词	Drought; ecophysiology; grasslands; prairies; water use
语种	英语
WOS研究方向	Plant Sciences ; Environmental Sciences & Ecology
WOS类目	Plant Sciences ; Ecology
WOS记录号	WOS:001187864700002
来源期刊	AOB PLANTS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/301113
作者单位	Marquette University
推荐引用方式 GB/T 7714	Dekirmenjian, Alina,Montano, Diego,Budny, Michelle L.,et al. Schizachyrium scoparium (C4) better tolerates drought than Andropogon gerardii (C4) via constant CO2 supply for photosynthesis during water stress[J],2024,16(2).
APA	Dekirmenjian, Alina,Montano, Diego,Budny, Michelle L.,&Lemoine, Nathan P..(2024).Schizachyrium scoparium (C4) better tolerates drought than Andropogon gerardii (C4) via constant CO2 supply for photosynthesis during water stress.AOB PLANTS,16(2).
MLA	Dekirmenjian, Alina,et al."Schizachyrium scoparium (C4) better tolerates drought than Andropogon gerardii (C4) via constant CO2 supply for photosynthesis during water stress".AOB PLANTS 16.2(2024).