Pedosphere 28(5): 793--803, 2018
ISSN 1002-0160/CN 32-1315/P
©2018 Soil Science Society of China
Published by Elsevier B.V. and Science Press
Effect of Rhizobacterium Rhodopseudomonas palustris Inoculation on Stevia rebaudiana Plant Growth and Soil Microbial Community
XU Jiangbing1,2, FENG Youzhi2, WANG Yanling1, and LIN Xiangui2
1International Center for Ecology, Meteorology, and Environment(IceMe), School of Applied Meteorology, Nanjing University of Information Science and Technology, Nanjing 210044(China)
2State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008(China)
      There is an increasing concern that the continuous use of chemical fertilizers might lead to harmful effects on soil ecosystem. Accordingly, a biocompatible approach involving inoculation of beneficial microorganisms is presented to promote plant growth and simultaneously minimize the negative effect of chemical fertilizers. In this study, Rhodopseudomonas palustris, a plant growth-promoting rhizobacterium (PGPR), was inoculated into both fertilized and unfertilized soils to assess its influence on Stevia rebaudiana plant growth and microbial community in rhizosphere soils in a 122-d field experiment. Soil enzyme assays (dehydrogenase, urease, invertase, and phosphomonoesterase), real-time quantitative polymerase chain reaction (RT-qPCR), and a high-throughput sequencing technique were employed to determine the microbial activity and characterize the bacterial community. Results showed that the R. palustris inoculation did not significantly influence Stevia yields and root biomass in either the fertilized or unfertilized soil. Chemical fertilization had strong negative effects on soil bacterial community properties, especially on dehydrogenase and urease activities. However, R. palustris inoculation counteracted the effect of chemical fertilizer on dehydrogenase and urease activities, and increased the abundances of some bacterial lineages (including Bacteroidia, Nitrospirae, Planctomycetacia, Myxococcales, and Legionellales). In contrast, inoculation into the unfertilized soil did not significantly change the soil enzyme activities or the soil bacterial community structure. For both the fertilized and unfertilized soils, R. palustris inoculation decreased the relative abundances of some bacterial lineages possessing photosynthetic ability, such as Cyanobacteria, Rhodobacter, Sphingomonadales, and Burkholderiales. Taken together, our observations stress the potential utilization of R. palustris as PGPR in agriculture, which might further ameliorate the soil microbial properties in the long run.
Key Words:  bacterial community structure,beneficial microorganism,chemical fertilization,plant growth-promoting rhizobacterium,soil enzyme activity
Citation: Xu J B, Feng Y Z, Wang Y L, Lin X G. 2018. Effect of rhizobacterium Rhodopseudomonas palustris inoculation on Stevia rebaudiana plant growth and soil microbial community. Pedosphere. 28(5):793-803.
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