含ACC脱氨酶的根际细菌提高植物抗盐性的研究进展

盐胁迫是抑制植物生长的主要非生物因素之一,高浓度的盐分不利于植物体的生长和发育,严重时会导致植物细胞及植物体死亡。已有大量实验结果显示含ACC脱氨酶的根际细菌可以缓解高盐对植物的危害。ACC脱氨酶可以降解乙烯的直接前体1-氨基环丙烷-1-羧酸(ACC),从而降低胁迫乙烯的合成量。胁迫乙烯是阻碍植物生长的主要原因。首先介绍了根际促生细菌的概念,概括了高盐对植物的毒害作用以及乙烯的生物合成和生理效应,着重阐述了含ACC脱氨酶的根际细菌的作用方式及其提高植物耐盐性的生理机制,以期为这类细菌在农业生产中的应用提供理论支撑。

Research Advances on Enhancement of Plant Resistance to Salinity Stress by Rhizobacteria Containing ACC Deaminase

Salinity is a major factor inhibiting plant growth.High concentration salinity is adverse to the growth and development of plants,and even leads to plant death when at serious level.A large number of experimental results have shown that the rhizobacteria containing ACC-deaminase may alleviate hazards of the high salinity to plants.The ACC-deaminase degrades ACC(1-aminocyclopropane-1-carboxylic acid,the precursor of ethylene in all higher plants),which results in the decrease of the synthesis of stressed ethylene.The stressed ethylene is the major cause to retard plant growth.In this review,we provided the concept of the plant growth-promoting rhizobacteria(PGPR),overviewed the toxic effects of high salinity on plants,the biosynthesis and physiological effects of ethylene,and emphatically elaborated the physiological mechanisms of underlying the ACC deaminase-containing rhizobacteria and improving plant tolerance to the high salinity.It is aimed to provide the theoretical support for the application of this type of bacterium in agriculture in the coming years.