| DOI: | 10.1111/ele.12851
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| Scopus记录号: | 2-s2.0-85031508807
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| 论文题名: | Plant resistance to drought depends on timely stomatal closure |
| 作者: | Martin-StPaul N.; Delzon S.; Cochard H.
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| 刊名: | Ecology Letters
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| ISSN: | 1461023X
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| EISSN: | 1461-0248
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| 出版年: | 2017
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| 卷: | 20, 期:11 | | 起始页码: | 1437
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| 结束页码: | 1447
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| 语种: | 英语
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| 英文关键词: | Dieback
; drought
; stomata
; tree mortality
; xylem embolism
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| 英文摘要: | Stomata play a significant role in the Earth's water and carbon cycles, by regulating gaseous exchanges between the plant and the atmosphere. Under drought conditions, stomatal control of transpiration has long been thought to be closely coordinated with the decrease in hydraulic capacity (hydraulic failure due to xylem embolism). We tested this hypothesis by coupling a meta-analysis of functional traits related to the stomatal response to drought and embolism resistance with simulations from a soil–plant hydraulic model. We report here a previously unreported phenomenon: the existence of an absolute limit by which stomata closure must occur to avoid rapid death in drought conditions. The water potential causing stomatal closure and the xylem pressure at the onset of embolism formation were equal for only a small number of species, and the difference between these two traits (i.e. safety margins) increased continuously with increasing embolism resistance. Our findings demonstrate the need to revise current views about the functional coordination between stomata and hydraulic traits and provide a mechanistic framework for modeling plant mortality under drought conditions. © 2017 John Wiley & Sons Ltd/CNRS |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/107548
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| Appears in Collections: | 气候减缓与适应
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作者单位: | URFM, INRA, Avignon, France; BIOGECO, INRA, Univ. Bordeaux, Pessac, France; Université Clermont-Auvergne, INRA, PIAF, Clermont-Ferrand, France
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| Recommended Citation: | |
Martin-StPaul N.,Delzon S.,Cochard H.. Plant resistance to drought depends on timely stomatal closure[J]. Ecology Letters,2017-01-01,20(11)
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