Ammonium has stronger Cd detoxification ability than nitrate by reducing Cd influx and increasing Cd fixation in Solanum nigrum L.

Autor: Zhang LD; Key Laboratory for Subtropical Wetland Ecosystem Research of MOE, College of the Environment and Ecology, Xiamen University, Xiamen, Fujian 361005, PR China., Liu X; Key Laboratory for Subtropical Wetland Ecosystem Research of MOE, College of the Environment and Ecology, Xiamen University, Xiamen, Fujian 361005, PR China; Taiyuan University of Technology, Taiyuan, Shanxi 030024, PR China., Wei MY; Key Laboratory for Subtropical Wetland Ecosystem Research of MOE, College of the Environment and Ecology, Xiamen University, Xiamen, Fujian 361005, PR China., Guo ZJ; Key Laboratory for Subtropical Wetland Ecosystem Research of MOE, College of the Environment and Ecology, Xiamen University, Xiamen, Fujian 361005, PR China., Zhao ZZ; Key Laboratory for Subtropical Wetland Ecosystem Research of MOE, College of the Environment and Ecology, Xiamen University, Xiamen, Fujian 361005, PR China., Gao CH; Key Laboratory for Subtropical Wetland Ecosystem Research of MOE, College of the Environment and Ecology, Xiamen University, Xiamen, Fujian 361005, PR China., Li J; Key Laboratory for Subtropical Wetland Ecosystem Research of MOE, College of the Environment and Ecology, Xiamen University, Xiamen, Fujian 361005, PR China., Xu JX; Key Laboratory for Subtropical Wetland Ecosystem Research of MOE, College of the Environment and Ecology, Xiamen University, Xiamen, Fujian 361005, PR China., Shen ZJ; Key Laboratory for Subtropical Wetland Ecosystem Research of MOE, College of the Environment and Ecology, Xiamen University, Xiamen, Fujian 361005, PR China., Zheng HL; Key Laboratory for Subtropical Wetland Ecosystem Research of MOE, College of the Environment and Ecology, Xiamen University, Xiamen, Fujian 361005, PR China. Electronic address: zhenghl@xmu.edu.cn.
Jazyk: angličtina
Zdroj: Journal of hazardous materials [J Hazard Mater] 2022 Mar 05; Vol. 425, pp. 127947. Date of Electronic Publication: 2021 Dec 01.
DOI: 10.1016/j.jhazmat.2021.127947
Abstrakt: Cadmium (Cd) is a harmful heavy metal that affects the growth and development of plants. Nitrogen (N) is an essential nutrient for plants, and appropriate N management can improve Cd tolerance. The aim of our study was to explore the effects of different forms of N on the molecular and physiological responses of the hyperaccumulator Solanum nigrum to Cd toxicity. Measurement of biomass, photosynthetic parameters, and Cd 2+ fluxes using non-invasive micro-test technique, Cd fluorescent dying, biochemical methods and quantitative real-time PCR analysis were performed in our study. Our results showed that ammonium (NH 4 + ) has stronger Cd detoxification ability than nitrate (NO 3 - ), which are likely attributed to the following three reasons: (1) NH 4 + decreased the influx and accumulation of Cd 2+ by regulating the transcription of Cd transport-related genes; (2) the ameliorative effects of NH 4 + were accompanied by the increased retention of Cd in the cell walls of roots; and (3) NH 4 + up-regulated SnExp expression.
(Copyright © 2021 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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