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New concerns about arsenic contamination in agricultural fields: an in-depth understanding of the occurrence and regulatory strategies for rice straighthead disease

文献类型： 外文期刊

作者： Liu, Qinghui 1 ; Zhao, Li 4 ; Cao, Yiran 1 ; Li, Dongqin 1 ; Shi, Hanzhi 1 ; Wu, Zhichao 1 ; Li, Furong 1 ; Wen, Dian 1 ; Wang, Xu 1 ;

作者机构： 1.Guangdong Acad Agr Sci, Inst Qual Stand & Monitoring Technol Agroprod, Guangzhou 510640, Peoples R China

2.Guangdong Prov Key Lab Qual & Safety Risk Assessme, Guangzhou 510640, Peoples R China

3.Minist Agr & Rural Affairs, Lab Qual & Safety Risk Assessment Agroprod Guangzh, Guangzhou 510640, Peoples R China

4.China Water Resources Pearl River Planning Surveyi, Guangzhou 510610, Peoples R China

关键词： Dimethylarsinic acid; Straighthead disease; Pectin metabolism; Hydrogen peroxide; Mitigation strategies

期刊名称：PLANT PHYSIOLOGY AND BIOCHEMISTRY （ 影响因子：5.7； 五年影响因子：6.4 ）

ISSN： 0981-9428

年卷期： 2025 年 226 卷

页码：

收录情况： SCI

摘要： Rice, a pivotal staple crop globally, faces a significant threat from straighthead disease, a pervasive physiological disorder that can diminish or obliterate yields, thereby jeopardizing food security. Currently, it is established that dimethylarsinic acid (DMA), a form of organic arsenic (As) commonly found in paddy fields, is the causal agent inducing rice straighthead disease. However, a systematic understanding of the mechanisms underlying DMA absorption, transport, toxicity, and the induction of straighthead disease remains lacking, as do effective methods for disease prevention and control. This review introduces the incidence of straighthead disease caused by DMA and delves into the potential physiological mechanisms. It synthesizes the factors influencing the uptake of methylated As and their association with straighthead disease in rice. The efficient translocation of DMA from roots to shoots, coupled with its high oxidative toxicity, leads to the manifestation of straighthead disease. Hydrogen peroxide appears to serve as a critical signaling molecule under DMA stress, elevating cell wall pectin levels and inhibiting cell expansion, leading to deformed panicles in diseased rice. Agricultural strategies aimed at diminishing the accumulation of methylated As in rice, such as intermittent flooding, minimizing organic matter input, applying chemical amendments, selecting varieties with low DMA accumulation, and employing bioremediation techniques, could mitigate straighthead disease. This review aims to heighten awareness of methylated As toxicity and straighthead disease, providing a foundational reference to guide future efforts in disease management within rice cultivation.

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