文献类型：期刊文献

英文题名：Xylem-based long-distance transport and phloem remobilization of copper in Salix integra Thunb

作者：Cao, Yini[1] Ma, Chuanxin[2] Chen, Hongjun[3] Zhang, Jianfeng[1] White, Jason C.[2] Chen, Guangcai[1] Xing, Baoshan[4]

第一作者：Cao, Yini

通信作者：Chen, GC[1]|[a000551c9abd7c3960d59]陈光才;

机构：[1]Chinese Acad Forestry, Res Inst Subtrop Forestry, Hangzhou 311400, Zhejiang, Peoples R China;[2]Connecticut Agr Expt Stn, Dept Analyt Chem, New Haven, CT 06504 USA;[3]Hunan Commod Qual Supervis & Inspect Inst, Changsha 410007, Peoples R China;[4]Univ Massachusetts, Stockbridge Sch Agr, Amherst, MA 01003 USA

年份：2020

卷号：392

外文期刊名：JOURNAL OF HAZARDOUS MATERIALS

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000527016900086)】；

基金：This work was supported by the Fundament Research Funds of CAF (Grant No. CAFYBB2019SZ001) and National Natural Science Foundation of China (Grant No.31470619). The mu-XRF analysis of this research was carried out at the 4W1B beamline of Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences. The authors sincerely acknowledge Drs. Dongliang Chen, Juncai Dong and all staff members of 4W1B, for their support in measurements and data reduction. The authors also thank Dr. Junkun Lu from RITFCAF, for his advice on sap extraction.

语种：英文

外文关键词：Cu-65; Translocation; mu-XRF; Organic component; Willow

摘要：Due to high biomass and an ability to accumulate metals, fast-growing tree species are good candidates for phytoremediation. However, little is known about the long-distance transport of heavy metals in woody plants. The present work focused on the xylem transport and phloem remobilization of copper (Cu) in Salix integra Thunb. Seedlings with 45 d preculture were grown in nutrient solutions added with 0.32 and 10 mu M CuSO4 for 5 d. Micro X-ray fluorescence imaging showed the high Cu intensity in xylem tissues of both stem and root cross sections, confirming that the xylem played a vital role in Cu transport from roots to shoots. Cu was presented in both xylem sap and phloem exudate, which demonstrates the long-distance transport of Cu via both vascular tissues. Additionally, the Cu-65 spiked mature leaf exported approximately 78 % Cu-65 to newly emerged shoots, and approximately 22 % downward to the new roots, confirming the bidirectional transport of Cu via phloem. To our knowledge, this is the first report to characterize Cu vascular transport and remobilization in fast-growing woody plants, and the findings provide valuable mechanistic understanding for the phytoremediation of Cucontaminated soils.