期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 416, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jhazmat.2021.126079
关键词
Metabolic profiles; Amino acid secretion; Soil cadmium availability; Paddy soil; Soil pe plus pH variation
资金
- National Natural Science Foundation of China [41877387]
- National Key Research and Development Program of China [2020YFC1806300-04]
The study showed that Mn increased the expression of Cd-related genes in rice root tissue, leading to metabolic reprogramming of soil and rice roots. Mn induced amino acid synthesis in rice roots under variable pe+pH levels, resulting in rhizosphere accumulation of free L-lysine, glycine, and glutamine, which can bind metal ions and form complexes with Cd. Therefore, secreted amino acids, low pe+pH, and free Mn can together offer a multi-faceted approach to managing Cd toxicity in rice.
Periodic flooding in paddy soils impacts redox behavior and induces variations in pe+pH levels. Manganese (Mn) is capable of reducing cadmium (Cd) uptake by rice. However, the processes involved in how Mn alters Cd mobilization under different pe+pH environments remain poorly understood. To investigate the mechanisms of Mn-mediated soil Cd-stabilization and subsequent inhibition of Cd uptake from flooded soils, we examined Cd immobilization in soil pot incubations, transcriptional changes in Cd-transport genes, and metabolomic analyses of roots and rhizosphere soils with or without Mn application. We found a decrease in extractable Cd concentration largely depended on irrigation-associated low pe+pH, exogenous Mn enhancement of Fe-Mn (oxyhydro) oxide-mediated Cd transformation, and Cd deposition in rice Fe/Mn plaques. Mn application led to striking effects on the expression of Cd-related genes eg. IRT, HMA, and NRAMP in rice root tissue. Exposure to Mn under variable pe+pH levels resulted in metabolic reprogramming of soil and rice roots. Mn induced amino acid synthesis in rice roots, leading to rhizosphere accumulation of free L-lysine, glycine, and glutamine, which can reportedly bind metal ions, forming complexes with Cd. Thus, secreted amino acids, low pe+pH, and free Mn can together comprise a multi-faceted approach to managing Cd toxicity in rice.
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