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Phosphorus deficiency induces root proliferation and Cd absorption but inhibits Cd tolerance and Cd translocation in roots of Populus × euramericana

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 × euramericana. Root growth was unaltered by Cd exposure regardles...

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Published in:Ecotoxicology and environmental safety 2020-11, Vol.204, p.111148-111148, Article 111148
Main Authors: Wang, Hao, Chen, Wenyi, Sinumvayabo, Narcisse, Li, Yunfei, Han, Zixuan, Tian, Jing, Ma, Qin, Pan, Zhenzhen, Geng, Zhaojun, Yang, Siqi, Kang, Mingming, Rahman, Siddiq Ur, Yang, Guijuan, Zhang, Yi
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Language:English
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Summary: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 × 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 roots, the translocation of Cd from roots 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 GA3, which synchronously reduced antioxidant capacity in roots. [Display omitted] •The adaptive root proliferation upon P deficiency was modified by Cd exposure.•P deficiency stimulated the expression of PM H + -ATPase and increased root Cd uptake.•P deficiency decreased the expression of genes for Cd translocation and detoxification.•P deficiency decreased GR activity and reduced Cd translocation via GSH–Cd complexes.•High Cd concentration in roots inhibited antioxidant enzymes and Cd translocation.
ISSN:0147-6513
1090-2414
DOI:10.1016/j.ecoenv.2020.111148