期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 425, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jhazmat.2021.127947
关键词
Phytoremediation regulation; Cd2+ influx; Nitrogen forms; Cd transport-related genes; H+ + influx
资金
- Natural Science Foun-dation of China [NSFC 32171740, 31870581, 31570586]
- Na-tional Key Research and Development Program of China [2017YFC0506102]
The study found that ammonium is more effective in detoxifying Cd in plants, mainly due to its regulation of Cd influx and accumulation, increased retention of Cd in cell walls, and up-regulation of SnExp expression.
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 Cd2+ fluxes using non-invasive micro-test technique, Cd fluorescent dying, biochemical methods and quantitative realtime PCR analysis were performed in our study. Our results showed that ammonium (NH4+) has stronger Cd detoxification ability than nitrate (NO3-), which are likely attributed to the following three reasons: (1) NH4+ decreased the influx and accumulation of Cd2+ by regulating the transcription of Cd transport-related genes; (2) the ameliorative effects of NH4+ were accompanied by the increased retention of Cd in the cell walls of roots; and (3) NH4+ up-regulated SnExp expression.
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