干旱区生态环境知识资源中心(Arid): Stomatal Sensitivity to Vapor Pressure Deficit and the Loss of Hydraulic Conductivity Are Coordinated inPopulus euphratica, a Desert Phreatophyte Species

Arid

DOI	10.3389/fpls.2020.01248
	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
通讯作者	Fan, DY
来源期刊	FRONTIERS IN PLANT SCIENCE
ISSN	1664-462X
出版年	2020
卷号	11
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.
英文关键词	hydraulic model xylem cavitation leaf specific hydraulic conductance stomatal conductance water homeostasis
类型	Article
语种	英语
开放获取类型	DOAJ Gold, Green Published
收录类别	SCI-E
WOS记录号	WOS:000566116500001
WOS关键词	POPULUS-EUPHRATICA ; WATER RELATIONS ; XYLEM EMBOLISM ; TAKLAMAKAN DESERT ; WOODY-PLANTS ; VULNERABILITY ; CAVITATION ; CONDUCTANCE ; DROUGHT ; VEGETATION
WOS类目	Plant Sciences
WOS研究方向	Plant Sciences
来源机构	中国科学院植物研究所 ; 北京林业大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/326040
作者单位	[Fan, Da-Yong; Xu, Cheng-Yang] Beijing Forestry Univ, Coll Forestry, Beijing, Peoples R China; [Dang, Qing-Lai] Lakehead Univ, Nat Resources Management, Thunder Bay, ON, Canada; [Jiang, Chuang-Dao; Xu, Xin-Wu; Yang, Xiao-Fang; Zhang, Shou-Ren] Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing, Peoples R China; [Zhang, Wang-Feng] Shihezi Univ, Key Lab Oasis Ecoagr, Xinjiang Prod & Construct Corps, Shihezi, Peoples R China; [Xu, Xin-Wu] China Meteorol Adm, Beijing, Peoples R China
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]. 中国科学院植物研究所, 北京林业大学,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).