Journal article

Authors list: Huang, Mengyuan; Zhang, Yihe; Yu, Qidong; Qian, Siyan; Shi, Yue; Zhang, Nan; Michelsen, Anders; Zhang, Jinbo; Mueller, Christoph; Li, Shuqing; Zhang, Ruifu; Shen, Qirong; Zou, Jianwen

Publication year: 2024

Journal: Applied Soil Ecology

Volume number: 201

ISSN: 0929-1393

eISSN: 1873-0272

DOI Link: https://doi.org/10.1016/j.apsoil.2024.105503

Publisher: Elsevier

Abstract: 
Plant growth-promoting microbes (PGPMs) are documented to stimulate nitrification rates and reduce N2O emissions in acidic soils. These microbes play a role in the nitrogen (N) transformation process, although the specific functions and mechanisms by which they affect the gross N transformation are not well understood. In particular, the influence of PGPMs on the relative predominance of ammonia oxidizers in the nitrification process is still unclear. In this study, we conducted a 15N tracing experiment to reveal the impact of PGPM Bacillus velezensis SQR9 on gross N transformations in acidic soils, as well as the microbial pathways involved. SQR9 inoculation considerably enhanced the processes of soil gross mineralization and nitrification by 14.6 % and 29.5 %, respectively. This improvement was found to be associated with the soil's dissolved organic carbon (DOC) content and carbon-to-nitrogen (C/N) ratio. SQR9 increased the abundance of ammonia-oxidizing bacteria (AOB), resulting in a substantial promotion of autotrophic nitrification, which occupied a dominant role (71.3-82.6 %) in the nitrification process. SQR9 significantly stimulated the proportion of AOB, indicating a transition from ammonia-oxidizing archaea (AOA) to AOB as the dominant ammonia oxidizers, hence promoting the gross nitrification rate. In conclusion, the heightened rates of N transformation are highly associated with the modification of the ammonia-oxidizer B. velezensis SQR9. Our findings offer an updated insight into how PGPMs cause N transformation and provide a theoretical basis for the sensible application of PGPMs in agricultural development.

Harvard Citation style: Huang, M., Zhang, Y., Yu, Q., Qian, S., Shi, Y., Zhang, N., et al. (2024) Bacillus velezensis SQR9-induced ammonia-oxidizing bacteria stimulate gross nitrification rates in acidic soils, Applied Soil Ecology, 201, Article 105503. https://doi.org/10.1016/j.apsoil.2024.105503

APA Citation style: Huang, M., Zhang, Y., Yu, Q., Qian, S., Shi, Y., Zhang, N., Michelsen, A., Zhang, J., Mueller, C., Li, S., Zhang, R., Shen, Q., & Zou, J. (2024). Bacillus velezensis SQR9-induced ammonia-oxidizing bacteria stimulate gross nitrification rates in acidic soils. Applied Soil Ecology. 201, Article 105503. https://doi.org/10.1016/j.apsoil.2024.105503