Guangdong nongye kexue (Dec 2022)
Research Advance in the Regulatory Mechanism of Phytohormone for Plant Responses to Aluminum Toxicity Stress
Abstract
Aluminum is the most abundant metal element in the crust. Soil acidification will cause great increase of the aluminum solubility to produce a large number of Al3+, which is toxic to plants. The activated aluminum will inhibit root growth, affect nutrient absorption and many physiological and biochemical metabolism processes, and further reduce crop yield. Aluminum toxicity has been the most important limiting factor for crop growth in acid soils which account for about 40% of cultivated land in the world. Phytohormones are the key endogenous factors that regulate plant responses to various environmental stresses, and are crucial to the improvement of plant resistance and plant survival under various stresses. It is well known that abscisic acid, auxin, ethylene, cytokinin, jasmonic acid and other major plant hormones play an important role in regulating plant responses to aluminum toxicity stress. A large number of studies have shown that plant hormones can also improve the adaptability of plants to aluminum stress by regulating the activities of cell wall-modifying enzymes, reactive oxygen species metabolism and organic acid secretion. In addition, there are complex interactions between different plant hormone signals, which jointly mediate and regulate the adaptive response of plants to aluminum stress. In order to have a more comprehensive and in-depth understanding of the mechanism of plant hormones in aluminum toxicity response, and to provide new ideas for molecular genetic improvement of plants tolerance to aluminum toxicity, in the study, the signal transduction and regulation of plant hormone signals in the process of plant response to aluminum toxicity stress are reviewed, and the future research direction of plant hormones under aluminum toxicity stress is prospected.
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