title: Survey of Plant Drought-Resistance Promoting Bacteria from Populus euphratica Tree Living in Arid Area.
abstract: Two hundred and thirty-two bacterial strains were isolated from the rhizospheric soil of Populus euphratica which is the dominant tree living in extreme arid regions in northwest China. Some strains with plant growth-promoting bacteria related metabolic characteristics were able to promote drought resistance in plants after inoculation. Ten strains with the greatest effects increased the dry weight of wheat shoots from 0.5 to 34.4 %, and the surface area of the root systems from 12.56 to 212.17 % compared to the control after drought treatment whereas no obvious promoting effect was observed in normal water conditions. These 10 strains were identified to be of the genera Pseudomonas, Bacillus, Stenotrophomonas and Serratia by 16S rRNA (rrs) gene sequence alignment. Among these strains, Serratia sp. 1-9 and Pseudomonas sp. 5-23 were the two most effective strains. Both of them produced auxin and the production increased significantly when cultured under simulated drought conditions which are inferred to be the most plausible mechanism for their plant growth-promoting effect under drought stress.
authors.affiliation: State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, 130 Meilong Road, Xuhui District, Shanghai, 200237 China.
authors.forename: Shanshan
authors.initials: S
authors.lastname: Wang
authors.affiliation: State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, 130 Meilong Road, Xuhui District, Shanghai, 200237 China.
authors.forename: Liming
authors.initials: L
authors.lastname: Ouyang
authors.affiliation: State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, 130 Meilong Road, Xuhui District, Shanghai, 200237 China.
authors.forename: Xiangyang
authors.initials: X
authors.lastname: Ju
authors.affiliation: Xinjiang Production & Construction Corps Key Laboratory of Protection and Utilization of Biological Resources in Tarim Basin, Tarim University, Alar, 843300 China.
authors.forename: Lili
authors.initials: L
authors.lastname: Zhang
authors.affiliation: Xinjiang Production & Construction Corps Key Laboratory of Protection and Utilization of Biological Resources in Tarim Basin, Tarim University, Alar, 843300 China.
authors.forename: Qin
authors.initials: Q
authors.lastname: Zhang
authors.affiliation: Xinjiang Production & Construction Corps Key Laboratory of Protection and Utilization of Biological Resources in Tarim Basin, Tarim University, Alar, 843300 China.
authors.forename: Yanbin
authors.initials: Y
authors.lastname: Li
keywords: Auxin; Drought stress; Plant drought-resistance promoting bacteria; Plant growth-promoting bacteria (PGPB); Populuseuphratica