气候变化领域集成服务门户(CCPortal): Drought supersedes warming in determining volatile and tissue defenses of piñon pine (Pinus edulis)

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DOI	10.1088/1748-9326/ab1493
	Drought supersedes warming in determining volatile and tissue defenses of piñon pine (Pinus edulis)
	Trowbridge A.M.; Stoy P.C.; Adams H.D.; Law D.J.; Breshears D.D.; Helmig D.; Monson R.K.
发表日期	2019
ISSN	17489318
卷号	14 期号:6
英文摘要	Trees are suffering mortality across the globe as a result of drought, warming, and biotic attacks. The combined effects of warming and drought on in situ tree chemical defenses against herbivory have not been studied to date. To address this, we transplanted mature piñon pine trees - a well-studied species that has undergone extensive drought and herbivore-related mortality - within their native woodland habitat and also to a hotter-drier habitat and measured monoterpene emissions and concentrations across the growing season. We hypothesized that greater needle temperatures in the hotter-drier site would increase monoterpene emission rates and consequently lower needle monoterpene concentrations, and that this temperature effect would dominate the seasonal pattern of monoterpene concentrations regardless of drought. In support of our hypothesis, needle monoterpene concentrations were lower across all seasons in trees transplanted to the hotter-drier site. Contrary to our hypothesis, basal emission rates (emission rates normalized to 30 °C and a radiative flux of 1000 μmol m-2 s-1) did not differ between sites. This is because an increase in emissions at the hotter-drier site from a 1.5 °C average temperature increase was offset by decreased emissions from greater plant water stress. High emission rates were frequently observed during June, which were not related to plant physiological or environmental factors but did not occur below pre-dawn leaf water potentials of -2 MPa, the approximate zero carbon assimilation point in piñon pine. Emission rates were also not under environmental or plant physiological control when pre-dawn leaf water potential was less than -2 MPa. Our results suggest that drought may override the effects of temperature on monoterpene emissions and tissue concentrations, and that the influence of drought may occur through metabolic processes sensitive to the overall needle carbon balance. © 2019 The Author(s). Published by IOP Publishing Ltd.
英文关键词	Drought; heat stress; monoterpenes; Pinus edulis; plant defense; secondary metabolites; volatile organic compounds
语种	英语
scopus关键词	Carbon; Driers (materials); Drought; Ecosystems; Forestry; Metabolites; Needles; Physiology; Plants (botany); Temperature; Tissue; Volatile organic compounds; Effects of temperature; Environmental factors; Heat stress; Pinus edulis; Plant defense; Pre-dawn leaf water potentials; Secondary metabolites; Tissue concentrations; Monoterpenes; Pinus edulis
来源期刊	Environmental Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/154547
作者单位	Department of Land Resources and Environmental Sciences, Montana State University, Bozeman, MT 59717, United States; Department of Plant Biology Ecology and Evolution, Oklahoma State University, Stillwater, OK 74078, United States; School of Natural Resources and the Environment, University of Arizona, Tucson, AZ 85721, United States; Department of Ecology and Evolutionary Biology, University of Arizona, Tucson, AZ 85721, United States; Institute of Arctic and Alpine Research, University of Colorado, Boulder, CO 80309, United States; Laboratory for Tree Ring Research, University of Arizona, Tucson, AZ 85721, United States
推荐引用方式 GB/T 7714	Trowbridge A.M.,Stoy P.C.,Adams H.D.,et al. Drought supersedes warming in determining volatile and tissue defenses of piñon pine (Pinus edulis)[J],2019,14(6).
APA	Trowbridge A.M..,Stoy P.C..,Adams H.D..,Law D.J..,Breshears D.D..,...&Monson R.K..(2019).Drought supersedes warming in determining volatile and tissue defenses of piñon pine (Pinus edulis).Environmental Research Letters,14(6).
MLA	Trowbridge A.M.,et al."Drought supersedes warming in determining volatile and tissue defenses of piñon pine (Pinus edulis)".Environmental Research Letters 14.6(2019).