Insight into the mechanism of indium toxicity in rice.

Autor: Cheah BH; Department of Agronomy, National Taiwan University, Taipei 10617, Taiwan., Liao PC; Department of Agronomy, National Taiwan University, Taipei 10617, Taiwan., Lo JC; Department of Horticulture and Biotechnology, Chinese Culture University, Taipei 11114, Taiwan., Wang YT; Department of Agronomy, National Taiwan University, Taipei 10617, Taiwan., Tang IC; Agricultural Biotechnology Research Center, Academia Sinica, Taipei 11529, Taiwan., Yeh KC; Agricultural Biotechnology Research Center, Academia Sinica, Taipei 11529, Taiwan., Lee DY; Department of Agricultural Chemistry, National Taiwan University, Taipei 10617, Taiwan., Lin YF; Department of Agronomy, National Taiwan University, Taipei 10617, Taiwan. Electronic address: yafenlin0725@ntu.edu.tw.
Jazyk: angličtina
Zdroj: Journal of hazardous materials [J Hazard Mater] 2022 May 05; Vol. 429, pp. 128265. Date of Electronic Publication: 2022 Jan 13.
DOI: 10.1016/j.jhazmat.2022.128265
Abstrakt: Indium is widely used in the technology industry and is an emerging form of environmental pollution. The presence of indium in soil and groundwater inhibits shoot and root growth in crops, thus reducing yields. However, the underlying mechanisms are unknown, making it difficult to design effective countermeasures. We explored the spatiotemporal effects of excess indium on the morphological, physiological and biochemical properties of rice (Oryza sativa L.). Indium accumulated mainly in the roots, severely restricting their growth and causing the acute perturbation of phosphorus, magnesium and iron homeostasis. Other effects included leaf necrosis and anatomical changes in the roots (thinned sclerenchyma and enlarged epidermal and exodermal layers). Whole-transcriptome sequencing revealed that rice immediately responded to indium stress by activating genes involved in heavy metal tolerance and phosphate starvation responses, including the expression of genes encoding phosphate-regulated transcription factors and transporters in the roots. Direct indium toxicity rather than phosphate deficiency was identified as the major factor affecting the growth of rice plants, resulting in the profound phenotypic changes we observed. The application of exogenous phosphate alleviated indium toxicity by reducing indium uptake. Our results suggest that indium immobilization could be used to prevent indium toxicity in the field.
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Databáze: MEDLINE
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