植物适应酸铝胁迫机理的研究进展

Advances in the mechanism of plant adaptation to acid aluminum stress

摘要:

酸铝胁迫是限制植物正常生长发育的重要非生物胁迫因子，严重制约了我国酸性土壤地区的农业生产水平。植物抵御酸铝胁迫的形式复杂多样，如分泌有机酸、提高根际pH、分泌黏液、细胞壁对Al³⁺的固定、有机酸对细胞溶质中Al³⁺的螯合与液泡区隔化等。现有研究多集中于常规生理特征分析，缺乏深入的分子生物学解析。基于此，本文对国内外植物适应酸铝胁迫机理的相关研究进行了归纳和总结，从酸铝胁迫对植物生长与生理代谢的影响、植物适应酸铝胁迫最主要的两种生理机制(Al排除机制、Al耐受机制)以及分子水平上调控相关耐铝基因进行了综述。最后针对现有研究的不足提出了展望，以期为深入揭示植物适应酸铝胁迫的机理以及挖掘适于酸土生长的优质作物资源提供理论依据。

Abstract:

The aluminum stress in acidic soil areas of China is an important abiotic stress factor that hampers the normal growth and development of plants and seriously affects the agricultural yield. The forms of plant resistance to aluminum stress are complex and diverse, which include secretion of organic acids, increase of rhizosphere pH, secretion of mucus, cell wall fixation of Al³⁺, organic acid chelation of Al³⁺ in cell solute, and vacuolar area isolation. Most of studies focus on analyzing conventional physiological characteristics, but in-depth molecular biological analyses are lacking. This review summarizes the mechanisms how plants adapt to acidic aluminum stress. This includes the effect of acid aluminum stress on plant growth and physiological metabolism, the two main physiological mechanisms of plant adaptation to acid aluminum stress (aluminum exclusion mechanism, aluminum tolerance mechanism), and the aluminum resistance related genes. Finally, this paper puts forward some prospects for further revealing the mechanism of plant adaptation to acid aluminum stress and excavating high-quality crops suitable for cultivation in acidic soils.