气候变化领域集成服务门户(CCPortal): Stomatal closure during water deficit is controlled by below-ground hydraulics

CCPortal

DOI	10.1093/aob/mcab141
	Stomatal closure during water deficit is controlled by below-ground hydraulics
	Abdalla, Mohanned; Ahmed, Mutez Ali; Cai, Gaochao; Wankmuller, Fabian; Schwartz, Nimrod; Litig, Or; Javaux, Mathieu; Carminati, Andrea
发表日期	2022
ISSN	0305-7364
EISSN	1095-8290
起始页码	161
结束页码	170
卷号	129 期号:2
英文摘要	Background and Aims Stomatal closure allows plants to promptly respond to water shortage. Although the coordination between stomatal regulation, leaf and xylem hydraulics has been extensively investigated, the impact of below-ground hydraulics on stomatal regulation remains unknown. Methods We used a novel root pressure chamber to measure, during soil drying, the relation between transpiration rate (E) and leaf xylem water pressure (psi(leaf-x)) in tomato shoots grafted onto two contrasting rootstocks, a long and a short one. In parallel, we also measured the E(psi(leaf-x)) relation without pressurization. A soil-plant hydraulic model was used to reproduce the measurements. We hypothesize that (1) stomata close when the E(psi(leaf-x)) relation becomes non-linear and (2) non-linearity occurs at higher soil water contents and lower transpiration rates in short-rooted plants. Key Results The E(psi(leaf-x)) relation was linear in wet conditions and became non-linear as the soil dried. Changing below-ground traits (i.e. root system) significantly affected the E(psi(leaf-x)) relation during soil drying. Plants with shorter root systems required larger gradients in soil water pressure to sustain the same transpiration rate and exhibited an earlier non-linearity and stomatal closure. Conclusions We conclude that, during soil drying, stomatal regulation is controlled by below-ground hydraulics in a predictable way. The model suggests that the loss of hydraulic conductivity occurred in soil. These results prove that stomatal regulation is intimately tied to root and soil hydraulic conductances.
英文关键词	Solanum lycopersicum; water stress; hydraulic signal; modelling; root system; hydraulic limitations
语种	英语
WOS研究方向	Plant Sciences
WOS类目	Science Citation Index Expanded (SCI-EXPANDED)
WOS记录号	WOS:000822064600006
来源期刊	ANNALS OF BOTANY
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/280864
作者单位	University of Bayreuth; University of Khartoum; University of California System; University of California Davis; Swiss Federal Institutes of Technology Domain; ETH Zurich; Hebrew University of Jerusalem; Universite Catholique Louvain; Helmholtz Association; Research Center Julich
推荐引用方式 GB/T 7714	Abdalla, Mohanned,Ahmed, Mutez Ali,Cai, Gaochao,et al. Stomatal closure during water deficit is controlled by below-ground hydraulics[J],2022,129(2).
APA	Abdalla, Mohanned.,Ahmed, Mutez Ali.,Cai, Gaochao.,Wankmuller, Fabian.,Schwartz, Nimrod.,...&Carminati, Andrea.(2022).Stomatal closure during water deficit is controlled by below-ground hydraulics.ANNALS OF BOTANY,129(2).
MLA	Abdalla, Mohanned,et al."Stomatal closure during water deficit is controlled by below-ground hydraulics".ANNALS OF BOTANY 129.2(2022).