土壤中非生物逆境胁迫与根系有机酸分泌

由于土壤特性及所处的生态条件等原因 ,植物常会遭受各种逆境胁迫。逆境胁迫包括病、虫等生物因素和物理、化学等非生物因素。植物非生物逆境多与土壤化学因素如 p H、盐分和养分的有效性有关 ,许多植物营养问题都起源于土壤矿质元素胁迫。逆境胁迫下 ,植物通过生理上的一系列改变 ,增加根系分泌物的释放 ,从而直接或间接影响土壤养分的有效性 1 ] 。根系分泌物是一古老而年轻的研究领域。早在 1 8世纪 ,人们就已注意到根系分泌物的作用。自 1 90 4年 Hiltner提出根际的概念后 ,植物根系分泌物受到了许多研究者的重视。尤其是近 3 0年以来…

Correlation between Abiotic-stress in Soil and Organic-acid Secretion by Root

Secretion of organic-acid from roots can operate by multiple mechanisms in response to a number of well-defined environmental stresses.This responses are highly stress and plant-species specific. Organic-acid especially low-molecular organic-acid,such as malate,citrate and oxalate, can carry varying negative charge,so they have been proposed being involved in many processes operating in the rhizosphere, including nutrient acquisition, metal detoxification and mineral weathering, ect. This review summarized the correlation between abiotic-stresses(Fe,P and Al) and organic-acid secretion by roots.In addition,this review briefed the action of organic-acid in the rhizosphere.