文献类型：期刊文献

英文题名：Lead exposure-induced defense responses result in low lead translocation from the roots to aerial tissues of two contrasting poplar species

作者：Shi, Wenguang[1] Zhou, Jing[1] Li, Jing[2] Ma, Chaofeng[1] Zhang, Yuhong[1] Deng, Shurong[1] Yu, Wenjian[1] Luo, Zhi-Bin[1]

第一作者：石文广

通信作者：Luo, ZB[1]

机构：[1]Chinese Acad Forestry, Res Inst Forestry, State Key Lab Tree Genet & Breeding, Key Lab Silviculture State Forestry & Grassland A, Beijing 100091, Peoples R China;[2]Nanjing Forestry Univ, Coll Light Ind & Food Engn, Dept Food Sci & Technol, Nanjing 210037, Peoples R China

年份：2021

卷号：271

外文期刊名：ENVIRONMENTAL POLLUTION

收录：;EI(收录号：20210109726053);Scopus(收录号：2-s2.0-85098618209);WOS:【SCI-EXPANDED(收录号:WOS:000614114100059)】；

基金：This study was jointly supported by the Fundamental Research Funds for the Central Non-profit Research Institutions of CAF (grant no. CAFYBB2020ZY002-2), Leading talents of scientific and technological innovation of the 10,000 Talents Program, and the National Natural Science Foundation of China (Grant Nos. 31670609 and 31901286).

语种：英文

外文关键词：Heavy metal; cell wall; Chemical forms; Transcriptional regulation

摘要：To explore whether lead (Pb)-induced defense responses are responsible for the low root-to-shoot Pb translocation, we exposed saplings of the two contrasting poplar species, Populus x canescens with relatively high root-to-shoot Pb translocation and P. nigra with low Pb translocation, to 0 or 8 mM PbCl2. Pb translocation from the roots to aboveground tissues was lower by 57% in P. nigra than that in P. x canescens. Lower Pb concentrations in the roots and aerial tissues, greater root biomass, and lower ROS overproduction in the roots were found in P. nigra than those in P. x canescens treated with Pb. P. nigra roots had higher proportions of cell walls (CWs)-bound Pb and water insoluble Pb compounds, and higher transcript levels of some pivotal genes related to Pb vacuolar sequestration, such as phytochelatin synthetase 1.1 (PCS1.1), ATP-binding cassette transporter C1.1 (ABCC1.1) and ABCC3.1 than P. x canescens roots. Pb exposure induced defense responses including increases in the contents of pectin and hemicellulose, and elevated oxalic acid accumulation, and the transcriptional upregulation of PCS1.1, ABCC1.1 and ABCC3.1 in the roots of P. nigra and P. x canescens. These results suggest that the stronger defense barriers in P. nigra roots are probably associated with the lower Pb translocation from the roots to aerial tissues, and that Pb exposure-induced defense responses can enhance the barriers against Pb translocation in poplar roots. (C) 2020 Elsevier Ltd. All rights reserved.