文献类型：期刊文献

英文题名：Accumulation and spatial distribution of copper and nutrients in willow as affected by soil flooding: A synchrotron-based X-ray fluorescence study

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

第一作者：Cao, Yini

通信作者：Chen, GC[1];Ma, CX[2]|[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]Univ Massachusetts, Stockbridge Sch Agr, Amherst, MA 01003 USA

年份：2019

卷号：246

起止页码：980-989

外文期刊名：ENVIRONMENTAL POLLUTION

收录：;EI(收录号：20190406422600);Scopus(收录号：2-s2.0-85060348935);WOS:【SCI-EXPANDED(收录号:WOS:000458222100111)】；

基金：The work was funded by the National Natural Science Foundation of China (31470619), the Key Research and Development Program of Zhejiang Province (2018C03047), and fundamental Research Funds of Chinese Academy of Forestry (RISF2014005). We gratefully acknowledge the support from 4W1B beamline of Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences. We sincerely thank Drs. Dongliang Chen, Juncai Dong and all staff members of 4W1B, for their assistance in measurements and data reduction efforts during the synchrotron-based XRF measurement.

语种：英文

外文关键词：Salix integra; Flooding; Copper; Spatial distribution; Synchrotron-based X-ray fluorescence

摘要：Copper (Cu) induced phytotoxicity has become a serious environmental problem as a consequence of significant metal release through anthropogenic activity. Understanding the spatial distribution of Cu in plants such as willow is essential to elucidate the mechanisms of metal accumulation and transport in woody plants, particularly as affected by variable environment conditions such as soil flooding. Using synchrotron-based X-ray fluorescence (mu-XRF) techniques, the spatial distribution of Cu and other nutrient elements were investigated in roots and stems of Salix (S.) integra exposed to 450 mg kg(-1) Cu under non-flooded (NF)/flooding (F) conditions for 90 d. S. integra grown in the F condition exhibited significant higher tolerance index (TI, determined by the ratio of total biomass in Cu treatments to control) (p <0.05) than that in the NF condition, indicating soil flooding alleviated Cu toxicity to willow plants. The mu-XRF revealed that Cu was preferentially located in the root cap and meristematic zone of the root tips. Under the NF condition, the Cu intensity in the root epidermis was more highly concentrated than that of the F condition, suggesting the soil flooding significantly inhibited Cu uptake by S. integra. The pattern of the Cu spatial distribution in the S. integra stem indicated that the F condition severely reduced Cu transport via the xylem vessels as a consequence of decreasing the transpiration rate of leaves. To our knowledge, this is the first study to report the in vivo Cu distribution in S. integra in a scenario of co-exposure to the Cu and the soil flooding over a long period. The finding that Cu uptake varies significantly with flooding condition is relevant to the development of strategies for plants to detoxify the metals and to maintain the nutrient homeostasis. (C) 2019 Elsevier Ltd. All rights reserved.