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Effects of Plant Growth-Promoting Rhizobacteria on the Growth and Soil Microbial Community of Carya illinoinensis

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Abstract

Plant growth-promoting rhizobacteria (PGPR) are important members of soil microbial communities. In this study, the effects of several PGPR on the growth of Carya illinoinensis plants, the microbial community composition and soil nutrients were investigated by inoculation tests to identify excellent PGPR strains. The experiment showed that after PGPR application, the plant height, ground diameter, and dry weight of C. illinoinensis were significantly increased compared with those of the control group, and Bacillus velezensis YH20 had the most significant effect in promoting growth (p < 0.05). In addition, all the PGPRs used for inoculation promoted plant root growth, and the Brevibacillus reuszeri MPT17 strain had the most significant promoting effect on plant root growth (p < 0.05). The application of PGPRs also affected the nutrient levels in plants and plant rhizosphere soil. For example, compared with the control, the levels of available phosphorus and potassium in rhizosphere soil and the total potassium content in plant roots were significantly increased under Br. reuszeri MPT17 treatment (p < 0.05). The experiment showed that the relative abundance of Mortierella, Dictyophora, and Bacillus in the rhizosphere soil increased significantly after the application of PGPR (p < 0.05). These genera could effectively improve the rate of soil nutrient use, antagonize plant pathogenic bacteria, and promote plant growth. This study provides basic reference data regarding the use of PGPR to improve the microecological environment and promote the growth and development of C. illinoinensis plants.

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Data Availability

The data presented in this study are available upon request from the corresponding author.

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Acknowledgements

We thank American Journal Experts (AJE) for English language editing. This manuscript was edited for English language by American Journal Experts (AJE).

Funding

Funding for this study was provided by the Forestry Industry Public Welfare Project of the State Forestry Administration of China (201304404).

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Authors and Affiliations

  1. Co-Innovation Center for Sustainable Forestry in Southern China, College of Forestry, Nanjing, China

    Ji-Wu Shi, Lan-Xiang Lu, Hui-Min Shi & Jian-Ren Ye

  2. Nanjing Forestry University, Nanjing, 210037, China

    Ji-Wu Shi, Lan-Xiang Lu, Hui-Min Shi & Jian-Ren Ye

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Contributions

JS performed the majority of the experiments and data analysis and drafted the associated contents of the manuscript. JY participated in the planning, interpretation of data, and supervision of manuscript writing. LL and HS were involved in the planning and execution of the research and analysis and interpretation of the data. All authors have read and agreed to the published version of the manuscript.

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Correspondence to Jian-Ren Ye.

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Shi, JW., Lu, LX., Shi, HM. et al. Effects of Plant Growth-Promoting Rhizobacteria on the Growth and Soil Microbial Community of Carya illinoinensis. Curr Microbiol 79, 352 (2022). https://doi.org/10.1007/s00284-022-03027-9

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