植物应答镁营养胁迫机理的研究进展

Abstract

镁(Magnesium, Mg)是植物生长发育必需的重要营养元素之一，也是细胞中最丰富的游离二价阳离子。人们近期发现：不同时期谷物中的镁含量随时间呈下降趋势，作物和牧草等相继出现了缺镁症；另一方面，由于地球表面部分地区土壤镁含量过高，抑制生物的正常生长发育，导致镁中毒症状。但是，与氮、磷、钾等元素相比，植物应答镁营养胁迫的研究往往被人们遗忘，研究相对滞后。因此，本综述主要从镁胁迫条件下植物生理、信号传递、镁离子转运体，以及镁与其他离子的互作等方面来阐述植物应答镁营养胁迫的研究进展，以期引起人们的重视，推动植物镁胁迫机理的研究。 Magnesium (Mg), one of the most core nutrients in plant growth and development, is the most ab-undant free divalent cation in cells. Shockingly, the Mg content in grains has presented a decrease over time in different periods, and some crops and forages appear Mg deficient symptoms. On the other hand, high Mg content in some soils inhibits plant growth and development, which leads to the Mg toxic symptoms. However, comparing with other nutrients, such as nitrogen, phosphorus or potassium, the responding mechanisms of Mg stress conditions in plants are known little today. Therefore, we integrate the research development recently on plant physiology, magnesium transporters, signaling responding to Mg stresses, and the interactions between Mg and other ions. This review is to attract people’s attention and promote the study of the responding mechanisms of magnesium stresses in plants.