Journal
BIOLOGIA PLANTARUM
Volume 59, Issue 4, Pages 601-608Publisher
ACAD SCIENCES CZECH REPUBLIC, INST EXPERIMENTAL BOTANY
DOI: 10.1007/s10535-015-0537-7
Keywords
abscisic acid; Al detoxification; Al tolerance mechanism; salicylic acid; signal transduction
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Funding
- National Natural Science Foundation of China [30960181, 31260296]
- Guangxi Innovation Program for Graduates [GXU11T31076]
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An excess of aluminum (Al) is a major factor limiting crop production in acidic soils. Secretion of organic acids (OAs) from the root apex of diverse plant species or genotypes via activation of anion channels has been recognized as the most important mechanism of Al exclusion. Citric, oxalic, and malic acids are the most effective OAs in detoxifying Al. In this review, we summarize biochemical properties of OAs secreted by plants. We also highlight the molecular mechanisms of Al signal perception, Al transport, signal regulators associated with OAs secretion, as well as interactions between Al and hormone signaling pathways. Based on a comprehensive understanding of the relationship between signal modulators and regulation of expression of relevant genes, a signal transduction model for Al-induced OAs secretion is proposed.
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