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The widespread occurrence of acidic soils presents a major challenge for agriculture, as it hampers productivity via a combination of mineral toxicity, nutrient deficiency, and poor water uptake. Conventional remediation methods, such as amending the soil with lime, magnesium, or calcium, are expensive and not environmentally friendly. The most effective method to mitigate soil acidity is the cultivation of acid-tolerant cultivars. The ability of plants to tolerate acidic soils varies significantly, and a key factor influencing this tolerance is aluminum (Al) toxicity. Therefore, understanding the physiological, molecular, and genetic underpinnings of Al tolerance is essential for the successful breeding of acid-tolerant crops. Different tolerance mechanisms are regulated by various genes and quantitative trait loci in various plant species, and molecular markers have been developed to facilitate gene cloning and to support marker-assisted selection for breeding Al-tolerant cultivars. This study provides a comprehensive review of the current developments in understanding the physiological and molecular mechanisms underlying Al resistance. Through the application of genome-wide association methods, it is expected that new Al-resistant genes can be identified and utilized to cultivate Al-resistant varieties through intercrossing, backcrossing, and molecular marker-assisted selection, promoting the sustainable use of acidic soils.
Zhu et al. (Sat,) studied this question.
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