Abstract
The effects of 13 plant growth–promoting rhizobacteria (PGPR) from the maize rhizosphere and a model PGPR strain Azospirillum brasilense Az39 on maize growth were monitored in a 3-year field inoculation experiment (from 2018 to 2020) with low-nitrogen (N) (N input reduced by 50%) and low-phosphorus (P) (no P supply) soils in Northeast China. The effects of four efficient PGPR that stably promoted maize plant growth and affected on the composition and function of the rhizobacterial community were further investigated in 2019 and 2020. On average, Sinorhizobium sp. A15, Bacillus sp. A28, Sphingomonas sp. A55, and Enterobacter sp. P24 stably increased grain yield by 8.1–17.8% and 11.0–20.1% in low-N and low-P soil, respectively. Inoculation of these four strains increased the abundance and species richness of rhizobacteria, enriched special beneficial bacteria such as Chloroflexia_KD4-96 and Bacilli, and decreased bacterial functions related to soil-N loss. We conclude that some PGPR can N- and P-use efficiency and maize yield through reshaping the rhizobacterial community.
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Data availability
The obtained sequences were submitted to the National Center for Biotechnology Information (NCBI) Sequence Read Archive (SRA) with accession number SRP309888. Other data that supports the findings of this study are available in the supplementary material of this article.
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Acknowledgements
We sincerely thank Dr. Fabricio Cassán (Universidad Nacional de Río Cuarto, Córdoba, Argentina) for providing the Azospirillum brasilense Az39. Special thanks to Ye Sha, Zhanhong Hao, Yuna Wang, Rong Shi, and Wenjun Shi for assistance with field management. We thank Jennifer Smith, PhD, from Liwen Bianji (Edanz) (www.liwenbianji.cn) for editing the English text of a draft of this manuscript.
Funding
This work was financially supported by the National Natural Science Foundation of China (project U19A2035) and the National Key Research & Development Program of China (project 2017YFD0201801).
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GHM and XHS designed the study. LC and KKL performed the experiments. LC, JYS, YW, TC, and YQWY isolated the bacteria from the maize rhizosphere. LC analyzed the data and prepared the figures and tables. LC, ETW, XHS, and GHM wrote the manuscript. CFT, WFC, and WXC provided resources. All authors read and approved the paper.
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Chen, L., Li, K., Shang, J. et al. Plant growth–promoting bacteria improve maize growth through reshaping the rhizobacterial community in low-nitrogen and low-phosphorus soil. Biol Fertil Soils 57, 1075–1088 (2021). https://doi.org/10.1007/s00374-021-01598-6
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DOI: https://doi.org/10.1007/s00374-021-01598-6