文献类型：期刊文献

英文题名：Corticular photosynthesis drives bark water uptake to refill embolized vessels in dehydrated branches of Salix matsudana

作者：Liu, Junxiang[1] Gu, Lin[1] Yu, Yongchang[1] Huang, Ping[1] Wu, Zhigang[2] Zhang, Qian[1] Qian, Yongqiang[1] Wan, Xianchong[3] Sun, Zhenyuan[1]

第一作者：刘俊祥

通信作者：Liu, JX[1];Sun, ZY[1]

机构：[1]Chinese Acad Forestry, Res Inst Forestry, State Key Lab Tree Genet & Breeding, Key Lab Tree Breeding & Cultivat State Forestry A, Beijing 100091, Peoples R China;[2]Guangzhou Univ, Sch Civil Engn, Guangzhou 510006, Guangdong, Peoples R China;[3]Chinese Acad Forestry, Inst New Forestry Technol, Beijing 100091, Peoples R China

年份：2019

卷号：42

期号：9

起止页码：2584-2596

外文期刊名：PLANT CELL AND ENVIRONMENT

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000481849900005)】；

基金：Fundamental Research Funds for the Central Nonprofit Research Institution of CAF, Grant/ Award Number: CAFYBB2018SY003; National Natural Science Foundation of China, Grant/ Award Number: 31600489

语种：英文

外文关键词：bark water uptake; corticular photosynthesis; dehydration; embolism repair; hydraulic conductivity; micro-CT; nonstructural carbohydrates; refilling; xylem transport

摘要：It is well known that xylem embolism can be repaired by bark water uptake and that the sugar required for embolism refilling can be provided by corticular photosynthesis. However, the relationship between corticular photosynthesis and embolism repair by bark water uptake is still poorly understood. In this study, the role of corticular photosynthesis in embolism repair was assessed using Salix matsudana branch segments dehydrated to -1.9 MPa (P-50, water potential at 50% loss of conductivity). The results indicated that corticular photosynthesis significantly promoted water uptake and nonstructural carbohydrate (NSC) accumulation in the bark and xylem during soaking, thereby effectively enhancing the refilling of the embolized vessels and the recovery of hydraulic conductivity. Furthermore, the influence of the extent of dehydration on the embolism refilling enhanced by corticular photosynthesis was investigated. The enhanced refilling effects were much higher in the mildly dehydrated (-1.5 MPa) and moderately dehydrated (-1.9 MPa) branch segments than in the severely dehydrated (-2.2 MPa) branch segments. This study provides evidence that corticular photosynthesis plays a crucial role in xylem embolism repair by bark water uptake for mildly and moderately dehydrated branches.