Stomatal Sensitivity to Vapor Pressure Deficit and the Loss of Hydraulic Conductivity Are Coordinated inPopulus euphratica, a Desert Phreatophyte Species

doi:10.3389/fpls.2020.01248

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	Stomatal Sensitivity to Vapor Pressure Deficit and the Loss of Hydraulic Conductivity Are Coordinated inPopulus euphratica, a Desert Phreatophyte Species
	Fan, Da-Yong ; Dang, Qing-Lai ; Xu, Cheng-Yang ; Jiang, Chuang-Dao ; Zhang, Wang-Feng ; Xu, Xin-Wu ; Yang, Xiao-Fang ; Zhang, Shou-Ren
刊名	FRONTIERS IN PLANT SCIENCE
	2020
卷号	11
关键词	hydraulic model xylem cavitation leaf specific hydraulic conductance stomatal conductance water homeostasis
ISSN号	1664-462X
DOI	10.3389/fpls.2020.01248
文献子类	Article
英文摘要	There are considerable variations in the percentage loss of hydraulic conductivity (PLC) at mid-day minimum water potential among and within species, but the underpinning mechanism(s) are poorly understood. This study tested the hypothesis that plants can regulate leaf specific hydraulic conductance (K-l)viaprecise control overPLCunder variable Delta psi(water potential differential between soil and leaf) conditions to maintain the-m/bconstant (-m: the sensitivity of stomatal conductance toVPD;b: reference stomatal conductance at 1.0 kPaVPD), whereVPDis vapor pressure deficit. We usedPopulus euphratica, a phreatophyte species distributed in the desert of Northwestern China, to test the hypothesis. Field measurements ofVPD, stomatal conductance (g(s)),g(s)responses toVPD, mid-day minimum leaf water potential (psi(lmin)), and branch hydraulic architecture were taken in late June at four sites along the downstream of Tarim River at the north edge of the Taklamakan desert. We have found that: 1) the-m/bratio was almost constant (=0.6) across all the sites; 2) the average psi(50)(the xylem water potential with 50% loss of hydraulic conductivity) was-1.63 MPa, and mid-dayPLCranged from 62 to 83%; 3) there were tight correlations between psi(50)and wood density/leaf specific hydraulic conductivity (k(l)) and between specific hydraulic conductance sensitivity to water potential [d(k(s))/dln(-psi)] and specific hydraulic conductivity (k(s)). A modified hydraulic model was applied to investigate the relationship betweeng(s)andVPDunder variable Delta psi andK(l)conditions. It was concluded thatP. euphraticawas able to controlPLCin order to maintain a relatively constant-m/bunder different site conditions. This study demonstrated that branchlet hydraulic architecture and stomatal response toVPDwere well coordinated in order to maintain relatively water homeostasis ofP. euphraticain the desert. Model simulations could explain the wide variations ofPLCacross and within woody species that are often observed in the field.
学科主题	Plant Sciences
出版地	LAUSANNE
WOS关键词	POPULUS-EUPHRATICA ; WATER RELATIONS ; XYLEM EMBOLISM ; TAKLAMAKAN DESERT ; WOODY-PLANTS ; VULNERABILITY ; CAVITATION ; CONDUCTANCE ; DROUGHT ; VEGETATION
WOS研究方向	Plant Sciences
语种	英语
出版者	FRONTIERS MEDIA SA
WOS记录号	WOS:000566116500001
资助机构	National Key Research and Development Program of China [2016YFA0 600802] ; State Key Project of Research and Development Plan [2016YFC0502104] ; Science and Technology Project of Beijing [Z171100004417019]
内容类型	期刊论文
源URL	[http://ir.ibcas.ac.cn/handle/2S10CLM1/21599]
专题	植被与环境变化国家重点实验室
作者单位	1.[Jiang, Chuang-Dao 2.China Meteorol Adm, Beijing, Peoples R China 3.Beijing Forestry Univ, Coll Forestry, Beijing, Peoples R China 4.[Fan, Da-Yong 5.Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing, Peoples R China 6.Shihezi Univ, Key Lab Oasis Ecoagr, Xinjiang Prod & Construct Corps, Shihezi, Peoples R China 7.Yang, Xiao-Fang 8.Xu, Xin-Wu 9.Lakehead Univ, Nat Resources Management, Thunder Bay, ON, Canada
推荐引用方式 GB/T 7714	Fan, Da-Yong,Dang, Qing-Lai,Xu, Cheng-Yang,et al. Stomatal Sensitivity to Vapor Pressure Deficit and the Loss of Hydraulic Conductivity Are Coordinated inPopulus euphratica, a Desert Phreatophyte Species[J]. FRONTIERS IN PLANT SCIENCE,2020,11.
APA	Fan, Da-Yong.,Dang, Qing-Lai.,Xu, Cheng-Yang.,Jiang, Chuang-Dao.,Zhang, Wang-Feng.,...&Zhang, Shou-Ren.(2020).Stomatal Sensitivity to Vapor Pressure Deficit and the Loss of Hydraulic Conductivity Are Coordinated inPopulus euphratica, a Desert Phreatophyte Species.FRONTIERS IN PLANT SCIENCE,11.
MLA	Fan, Da-Yong,et al."Stomatal Sensitivity to Vapor Pressure Deficit and the Loss of Hydraulic Conductivity Are Coordinated inPopulus euphratica, a Desert Phreatophyte Species".FRONTIERS IN PLANT SCIENCE 11(2020).