Organic acid anions: An effective defensive weapon for plants against aluminum toxicity and phosphorus deficiency in acidic soils

Zhi Chang Chen,
Hong Liao^,

Root Biology Center, Fujian Agriculture and Forestry University, Fujian, Fuzhou 350002, China

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Corresponding author: E-mail address: hliao@fafu.edu.cn (Hong Liao)

摘要

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Abstract: Aluminum (Al) toxicity and phosphorous (P) deficiency are two major limiting factors for plant growth on acidic soils. Thus, the physiological mechanisms for Al tolerance and P acquisition have been intensively studied. A commonly observed trait is that plants have developed the ability to utilize organic acid anions (OAs; mainly malate, citrate and oxalate) to combat Al toxicity and P deficiency. OAs secreted by roots into the rhizosphere can externally chelate Al³⁺ and mobilize phosphate (Pi), while OAs synthesized in the cell can internally sequester Al³⁺ into the vacuole and release free Pi for metabolism. Molecular mechanisms involved in OA synthesis and transport have been described in detail. Ensuing genetic improvement for Al tolerance and P efficiency through increased OA exudation and/or synthesis in crops has been achieved by transgenic and marker-assisted breeding. This review mainly elucidates the crucial roles of OAs in plant Al tolerance and P efficiency through summarizing associated physiological mechanisms, molecular traits and genetic manipulation of crops.
- Organic acid anions /
- Al toxicity /
- P deficiency /
- Acidic soils

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参考文献(93)

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