State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, 130 Meilong Road, Xuhui District, Shanghai, 200237 China.
Xinjiang Production & Construction Corps Key Laboratory of Protection and Utilization of Biological Resources in Tarim Basin, Tarim University, Alar, 843300 China.
Indian J Microbiol. 2014 Dec;54(4):419-26. doi: 10.1007/s12088-014-0479-3. Epub 2014 Jun 13.
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.
从中国西北极端干旱地区的优势树种胡杨的根际土壤中分离到 232 株细菌。一些具有植物促生菌相关代谢特性的菌株在接种后能够提高植物的抗旱性。10 株效果最好的菌株在干旱处理后，使小麦苗干重增加了 0.5%到 34.4%，根系表面积增加了 12.56%到 212.17%，而在正常水分条件下没有明显的促进作用。通过 16S rRNA（rrs）基因序列比对，这 10 株菌被鉴定为假单胞菌属、芽孢杆菌属、寡养单胞菌属和沙雷氏菌属。在这些菌株中，沙雷氏菌 1-9 和假单胞菌 5-23 是两种最有效的菌株。它们都能产生生长素，在模拟干旱条件下培养时，生长素的产量显著增加，这被推断是它们在干旱胁迫下促进植物生长的最可能机制。
