文献类型：期刊文献

英文题名：Phosphorus deficiency induces root proliferation and Cd absorption but inhibits Cd tolerance and Cd translocation in roots of Populus x euramericana

作者：Wang, Hao[1] Chen, Wenyi[1] Sinumvayabo, Narcisse[1] Li, Yunfei[1] Han, Zixuan[1] Tian, Jing[1] Ma, Qin[1] Pan, Zhenzhen[1] Geng, Zhaojun[1] Yang, Siqi[1] Kang, Mingming[1] Rahman, Siddiq Ur[2] Yang, Guijuan[3] Zhang, Yi[1]

第一作者：Wang, Hao

通信作者：Yang, GJ[1];Zhang, Y[2]

机构：[1]Northwest A&F Univ, Coll Forestry, State Key Lab Crop Stress Biol Arid Areas, Yangling 712100, Shaanxi, Peoples R China;[2]Khushal Khan Khattak Univ, Dept Comp Sci & Bioinformat, Karak 27200, Khyber Pakhtunk, Pakistan;[3]Chinese Acad Forestry, Res Inst Forestry, Key Lab Tree Breeding & Cultivat, State Forestry Adm, Beijing 100091, Peoples R China

年份：2020

卷号：204

外文期刊名：ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000574854300007)】；

基金：This project was financially supported by National Key R&D Program of China (Grant No. 2016YFD0600105), the Key R&D Program of Shaanxi province (Grant No. 2020NY-055), and the China Scholarship Council (CSC NO. 201706305011).

语种：英文

外文关键词：Phosphorus deficiency; Root proliferation; Cd absorption; Cd translocation; Cd tolerance

摘要：To disclose how phosphorus deficiency influence phytoremediation of Cd contamination using poplars, root architecture, Cd absorption, Cd translocation and antioxidant defense in poplar roots were investigated using a clone of Populus x euramericana. Root growth was unaltered by Cd exposure regardless of P conditions, while the degree of root proliferation upon P deficiency was changed by high level of Cd exposure. The concentration and content of Cd accumulation in roots were increased by P deficiency. This can be partially explained by the increased expression of genes encoding PM H + -ATPase under the combined conditions of P deficiency and high Cd exposure, which enhanced Cd2+ -H+ exchanges and led to an increment of Cd uptake under P deficiency. Despite of the increasing Cd accumulation in mots, the translocation of Cd from mots to aerial tissues sharply decreased upon P deficiency. The relative expression of genes responsible for Cd translocation (HMA4) decreased upon P deficiency and thus inhibited Cd translocation via xylem. GR activity was decreased by P deficiency, which can inhibit the form of GSH and GSH-Cd complexes and decrease Cd translocation via GSH-Cd complexes. The transportation of PC-Cd complexes into vacuole decreased under P deficiency as a result of the low expression of PCS and ABCC1, and thus suppressed Cd tolerance and Cd detoxification in roots. Moreover, P deficiency decreased the levels of antioxidase (GR and CAT) and phytohormones including JA, ABA and GA(3), which synchronously reduced antioxidant capacity in roots.