Role of root exudates in metal acquisition and tolerance.

Yi-Tze Chen, Ying Wang, Kuo-Chen Yeh

Journal: Current opinion in plant biology 2018;39():66-72

PMID: 28654805

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Abstract

Plants acquire mineral nutrients mostly through the rhizosphere; they secrete a large number of metabolites into the rhizosphere to regulate nutrient availability and to detoxify undesirable metal pollutants in soils. The secreted metabolites are inorganic ions, gaseous molecules, and mainly carbon-based compounds. This review focuses on the mechanisms and regulation of low-molecular-weight organic-compound exudation in terms of metal acquisition. We summarize findings on riboflavin/phenolic-facilitated and phytosiderophore-facilitated iron acquisition and discuss recent studies of the functions and secretion mechanisms of low-molecular-weight organic acids in heavy-metal detoxification.

Address: Agricultural Biotechnology Research Center, Academia Sinica, Taipei, Taiwan.; Agricultural Biotechnology Research Center, Academia Sinica, Taipei, Taiwan. Electronic address: [email protected].

DOI: 10.1016/j.pbi.2017.06.004

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MeSH Terms: Carboxylic Acids, Metals, Heavy, Plant Exudates, Plant Roots