Abscisic acid enhances lead translocation from the roots to the leaves and alleviates its toxicity in Populus × canescens
| Autor: | Wenzhe Liu, Zhi-Bin Luo, Hojka Kraigher, Wen-Guang Shi, Tanja Mrak, Shen Ding, Wenjian Yu, Yuhong Zhang, Hong Li |
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| Rok vydání: | 2019 |
| Předmět: |
Environmental Engineering
Health Toxicology and Mutagenesis 0211 other engineering and technologies Chromosomal translocation Ascorbic Acid 02 engineering and technology 010501 environmental sciences Photosynthesis Plant Roots 01 natural sciences Antioxidants chemistry.chemical_compound Gene Expression Regulation Plant Botany Environmental Chemistry Sulfhydryl Compounds Waste Management and Disposal Abscisic acid Phylogeny 0105 earth and related environmental sciences chemistry.chemical_classification 021110 strategic defence & security studies Reactive oxygen species fungi food and beverages Glutathione Pollution Plant Leaves Oxidative Stress Populus × canescens Populus Lead chemistry Stele Toxicity Adsorption Reactive Oxygen Species Abscisic Acid |
| Zdroj: | Journal of Hazardous Materials. 362:275-285 |
| ISSN: | 0304-3894 |
| DOI: | 10.1016/j.jhazmat.2018.09.024 |
| Popis: | To shed light on physiological mechanisms underlying abscisic-acid (ABA)-mediated lead (Pb) uptake, translocation and detoxification, we exposed Populus × canescens saplings to either 0 or 3 mM Pb2+ in combination with either 0 or 10 μM exogenous ABA. Pb was taken up by the roots and accumulated mainly in the cortex. A fraction of the Pb in the roots was translocated to the leaves, thereby resulting in decreased photosynthesis and biomass. Pb accumulation caused a burst of reactive oxygen species (ROS), with higher concentrations of total thiols, glutathione, and ascorbate in the roots and/or leaves. Exogenous ABA stimulated Pb uptake, decreased Pb deposition in the cortex, and enhanced Pb vascular loading in the roots. Exogenous ABA alleviated the Pb-induced reductions in photosynthesis and root biomass, and decreased Pb-triggered ROS overproduction in the roots and/or leaves. Correspondingly, exogenous ABA stimulated the mRNA levels of a few genes involved in Pb uptake, transport, and detoxification, including NRAMP1.4, ABCG40, FRD3.1, PCS1.1, and ABCC1.1. These results suggest that exogenous ABA enhances Pb uptake and translocation, and alleviates Pb toxicity in poplars through the ABA-induced movement of Pb from the root cortex to the vascular stele, and transcriptionally regulated key genes involved in Pb tolerance. |
| Databáze: | OpenAIRE |
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