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Physiological and molecular mechanisms of plant-root responses to iron toxicity

文献类型： 外文期刊

作者： Li, Guangjie 1 ; Wu, Jinlin 2 ; Kronzucker, Herbert J. 3 ; Li, Baohai 4 ; Shi, Weiming 2 ;

作者机构： 1.Shandong Acad Agr Sci, Inst Agr Resources & Environm, State Key Lab Nutrient Use & Management, Jinan 250100, Peoples R China

2.Chinese Acad Sci, Inst Soil Sci, State Key Lab Soil & Sustainable Agr, Nanjing 210008, Peoples R China

3.Univ Melbourne, Sch Biosci, Parkville, Vic 3010, Australia

4.Zhejiang Univ, Coll Environm & Resource Sci, MOE Key Lab Environm Remediat & Ecol Hlth, Hangzhou 310058, Zhejiang, Peoples R China

5.Foshan Univ, Int Res Ctr Environm Membrane Biol, Foshan 528000, Peoples R China

6.Univ Chinese Acad Sci, 19 A Yuquan Rd, Beijing 100049, Peoples R China

关键词： Roots; Iron toxicity; Response; Signaling; Molecular mechanisms

期刊名称：JOURNAL OF PLANT PHYSIOLOGY （ 影响因子：4.3； 五年影响因子：4.5 ）

ISSN： 0176-1617

年卷期： 2024 年 297 卷

页码：

收录情况： SCI

摘要： The chemical form and physiological activity of iron (Fe) in soil are dependent on soil pH and redox potential (Eh), and Fe levels in soils are frequently elevated to the point of causing Fe toxicity in plants, with inhibition of normal physiological activities and of growth and development. In this review, we describe how iron toxicity triggers important physiological changes, including nitric -oxide (NO) -mediated potassium (K+) efflux at the tips of roots and accumulation of reactive oxygen species (ROS) and reactive nitrogen (RNS) in roots, resulting in physiological stress. We focus on the root system, as the first point of contact with Fe in soil, and describe the key processes engaged in Fe transport, distribution, binding, and other mechanisms that are drawn upon to defend against high -Fe stress. We describe the root -system regulation of key physiological processes and of morphological development through signaling substances such as ethylene, auxin, reactive oxygen species, and nitric oxide, and discuss gene -expression responses under high Fe. We especially focus on studies on the physiological and molecular mechanisms in rice and Arabidopsis under high Fe, hoping to provide a valuable theoretical basis for improving the ability of crop roots to adapt to soil Fe toxicity.

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