镉和铁及其交互作用对植物生长的影响

Effects of cadmium and iron and their interactions on plants growth: a review

镉是植物的非必需元素,而铁是植物生长发育过程中必不可少的元素。虽然这两种元素对植物的作用是截然相反的,但是它们在植物体内存在着交互作用关系,相互影响着对方功能的发挥。供给植物足够的铁可极大地缓解植物的镉污染毒害,利于植物合成更多的叶绿素,促进光合作用进行,降低镉对氨基酸、蛋白质合成以及酶活性的影响。相反,镉污染将诱导植物的铁营养缺乏。渍水植物根表形成的铁氧化物胶膜可促进植物对镉的吸收。

Cadmium is not an essential nutrient element for plants, but iron is the essential one. There are some mutual impacts be-tween cadmium and iron. Appropriate iron nutrient supply has a beneficial influence on cadmium-damaged plants, resulting in syn-thesizing more chlorophyll, promoting photosynthesis, and lowering cadmium toxicity to the synthesis of amino acid and protein, and enzyme activity. On the contrary, cadmium contamination induces iron deficiency in plants. Iron plaque formation on the root surface of waterlogging plants leads to uptake more cadmium.