Alleviation of the effect of environmental stresses using co-inoculation of mungbean by Bradyrhizobium and rhizobacteria containing stress-induced ACC deaminase enzyme

Abstract Ethylene is synthesized at accelerated rate in response to stress conditions, and regarded as a stress hormone that inhibits overall plant growth. Apparently, the amount of ethylene can be reduced by using silver thiosulfate (STS) or bacteria containing 1-amino-cyclopropane-1-carboxylate (ACC) deaminase. In this study, we examined whether different concentrations of STS differently prevent legume growth under various environment stress conditions, and whether co-inoculation of mungbean (Vigna radiata (L.) R. Wilczek)  by Bradyrhizobium and rhizobacteria containing ACC deaminase also alleviates legume stress. Mungbean is one of the most responsive plants among tested legume species, and different varieties of mungbean also respond differently to STS. Stress conditions and inappropriate concentrations of STS affect plant growth and symbiosis, while a suitable concentration of STS supports plant growth under stress conditions. Three isolates of bacteria containing ACC deaminase, Enterobacter sp. ACC...