气候变化领域集成服务门户(CCPortal): Evolutionary relationships between drought-related traits and climate shape large hydraulic safety margins in western North American oaks

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DOI	10.1073/pnas.2008987118
	Evolutionary relationships between drought-related traits and climate shape large hydraulic safety margins in western North American oaks
	Skelton R.P.; Anderegg L.D.L.; Diaz J.; Kling M.M.; Papper P.; Lamarque L.J.; Delzon S.; Dawson T.E.; Ackerly D.D.
发表日期	2021
ISSN	00278424
卷号	118 期号:10
英文摘要	Quantitative knowledge of xylem physical tolerance limits to dehydration is essential to understanding plant drought tolerance but is lacking in many long-vessel angiosperms. We examine the hypothesis that a fundamental association between sustained xylem water transport and downstream tissue function should select for xylem that avoids embolism in long-vessel trees by quantifying xylem capacity to withstand air entry of western North American oaks (Quercus spp.). Optical visualization showed that 50% of embolism occurs at water potentials below -2.7 MPa in all 19 species, and -6.6 MPa in the most resistant species. By mapping the evolution of xylem vulnerability to embolism onto a fossil-dated phylogeny of the western North American oaks, we found large differences between clades (sections) while closely related species within each clade vary little in their capacity to withstand air entry. Phylogenetic conservatism in xylem physical tolerance, together with a significant correlation between species distributions along rainfall gradients and their dehydration tolerance, suggests that closely related species occupy similar climatic niches and that species’ geographic ranges may have shifted along aridity gradients in accordance with their physical tolerance. Such trends, coupled with evolutionary associations between capacity to withstand xylem embolism and other hydraulic-related traits, yield wide margins of safety against embolism in oaks from diverse habitats. Evolved responses of the vascular system to aridity support the embolism avoidance hypothesis and reveal the importance of quantifying plant capacity to withstand xylem embolism for understanding function and biogeography of some of the Northern Hemisphere’s most ecologically and economically important plants. © 2021 National Academy of Sciences. All rights reserved.
英文关键词	Drought tolerance; Embolism avoidance hypothesis; Hydraulic safety margins; Plant hydraulic function; Xylem embolism
语种	英语
scopus关键词	Article; biogeography; climate; drought tolerance; evolution; grape; hydraulic conductivity; Laurus nobilis; morphological trait; nonhuman; North American; oak; olive tree; phylogeny; priority journal; Quercus durata; Quercus sadleriana; Quercus vacciniifolia; water deficit; water loss; xylem
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/180371
作者单位	Department of Integrative Biology, University of California, Berkeley, CA 94720, United States; Fynbos Node, South African Environmental Observation Network, Newlands, Cape Town, 7735, South Africa; Department of Ecology, Evolution and Marine Biology, University of California, Santa Barbara, CA 93117, United States; Département des Sciences de l’Environnement, Université du Québec à Trois-Rivières, Trois-Rivières, QC G9A 5H7, Canada; Université de Bordeaux, INRAE (Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement), UMR BIOGECO, Pessac, 33615, France; Department of Environmental Science, Policy, and Management, University of California, Berkeley, CA 94720, United States
推荐引用方式 GB/T 7714	Skelton R.P.,Anderegg L.D.L.,Diaz J.,et al. Evolutionary relationships between drought-related traits and climate shape large hydraulic safety margins in western North American oaks[J],2021,118(10).
APA	Skelton R.P..,Anderegg L.D.L..,Diaz J..,Kling M.M..,Papper P..,...&Ackerly D.D..(2021).Evolutionary relationships between drought-related traits and climate shape large hydraulic safety margins in western North American oaks.Proceedings of the National Academy of Sciences of the United States of America,118(10).
MLA	Skelton R.P.,et al."Evolutionary relationships between drought-related traits and climate shape large hydraulic safety margins in western North American oaks".Proceedings of the National Academy of Sciences of the United States of America 118.10(2021).