根系分泌物的作用及影响因素

Effects and roles of root exudates

综述了根系分泌物的组成成分、作用和植物种类、养分胁迫、根际微生物等对植物根系分泌物种类和数量的影响。在逆境胁迫条件下,植物根系分泌物数量一般都明显增多,它可以缓解植物在养分缺乏或金属毒害条件下的生长状态;有些植物根系分泌物中的某些酚酸类物质,浓度较高时,会对其他植物甚至自身造成毒害作用,抑制植物的生长发育。深入研究根系分泌物产生的机理及其生理生态效应,将有助于进一步了解植物根-土壤界面进行的生理生化过程及其调控的机制。

This paper summarized the component and role of root exudates, as well as the effects of vegetation types, nutrition stress and rhizosphere microorganisms on the types and quantity of root exudates. In general, under stress condition, the quantity of root exudates increase significantly,it ameliorates plant＇s growing situation under lacking of nutrition or metal contaminated condition. Some of phenolic acids in root exudates is harmful to plants at high concentration; at the same time it restrains plants＇growth. Further research on the generation mechanism of the root exudates and their reflections in physiology and ecology, will help to further understand the physiologic and ecological course on root and soil interface and the mechanism of control and regulation.