| 摘要: |
| 为了从青藏高原北部(简称藏北)退化草原的土壤中分离筛选可以促进当地典型牧草生长的促生菌株,以促进藏北植被修复。该文通过采用稀释涂平板的方法,分离耐低温植物促生菌株,并结合盆栽试验设计,评估分离细菌对当地牧草生长的影响。结果表明:(1)从西藏土壤中成功筛选得到两株耐低温细菌TS22和TS27,经16S rRNA基因鉴定分别属于Brevibacterium sp.和Bacillus mycoides。(2)通过离体评估两株分离菌植物促生属性的结果显示,菌株TS22和TS27均具有产生IAA、SID的能力和ACC-脱氨酶活性,TS22具有较高的ACC-脱氨酶活性(264.69 nmol·α-KB mg-1·h-1),TS27显示出较强的产IAA[(7.52±3.85)mg·L-1]和SID(92%)的能力。(3)盆栽试验显示,在10 ℃低温环境下,菌株TS22和TS27对早熟禾和老芒麦生长的影响因植物和菌种的不同而有所不同; 菌株TS22在株高、根长、地上和地下干重方面显著促进了早熟禾的生长,且促生能力优于TS27。该研究结果为植物-微生物技术在藏北高寒地区植被恢复中的使用提供了很好的菌种资源和实践基础。 |
| 关键词: 植物促生菌, 低温环境, 耐低温菌, 植物促生属性, 植物修复, 草原退化 |
| DOI：10.11931/guihaia.gxzw202003010 |
| 分类号:Q945 |
| 文章编号:1000-3142(2021)09-1425-08 |
| Fund project:国家重点研究发展计划项目(2016YFC0502002); 国家自然科学基金(31770446,31700108); 江苏省高等学校重点学科发展计划项目(PAPD); 江苏省水处理技术与材料协同创新中心项目 [Supported by the National Key Research and Development Program of China(2016YFC0502002); the National Natural Science Foundation of China(31770446, 31700108); Priority Academic Program Development of Jiangsu Higher Education Institutions(PAPD); Jiangsu Collaborative Innovation Center of Technology and Material of Water Treatment]。 |
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| Isolation of two cold-tolerant PGPB strains from northern |
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HE Min, WANG Xiupu, LI Yan, DAI Zhicong, WANG Congyan, DU Hai, DU Daolin*
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1.Institute of Environment and Ecology, Academy of Environmental Health and Ecological Security &2.School of
Environment and Safety Engineering, Jiangsu University, Zhenjiang 212013, Jiangsu, China
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| Abstract: |
| The objective of this study was to screen cold-tolerant plant growth-promoting bacteria(PGPB)for local typical grass in Northern Tibetan Plateau. The serial dilution plating method was used to isolate the PGPB, and pot experiment was designed to evaluate the effect of isolated PGPB on the growth of local grass. The results were as follows:(1)In total, two cold-tolerant PGPB strains named TS22 and TS27 were obtained, which were identified as Brevibacterium sp. and Bacillus mycoides respectively by 16S rRNA gene sequence analysis.(2)Both two strains could produce IAA, SID and ACC-deaminase activity. Strain TS22 showed high ACC-deaminase activity(264.69 nmol·α-KB mg-1·h-1), TS27 displayed higher IAA [(7.52±3.85)mg·L-1] and SID(92%)production ability.(3)Under low temperature(10 ℃), these two isolated PGPB exerted different effects on the growth of Poa annua and Elymus sibericus. Inoculation of strain TS22 significantly improved the growth of Poa annua in plant height, root length, aboveground dry weight, underground dry weight, and showed greater plant growth-promoting activity than strain TS27. This study provides valuable strain resources and experimental basis for application of plant-microbe technique in vegetation restoration in Northern Tibetan Plateau. |
| Key words: plant growth-promoting bacteria, low-temperature environment, low-temperature-tolerant bacteria, plant growth-promoting properties, plant phytoremediation, grassland degradation |
