Bacillus velezensis SQR9-induced ammonia-oxidizing bacteria stimulate gross nitrification rates in acidic soils
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Bacillus velezensis SQR9-induced ammonia-oxidizing bacteria stimulate gross nitrification rates in acidic soils. / Huang, Mengyuan; Zhang, Yihe; Yu, Qidong; Qian, Siyan; Shi, Yue; Zhang, Nan; Michelsen, Anders; Zhang, Jinbo; Müller, Christoph; Li, Shuqing; Zhang, Ruifu; Shen, Qirong; Zou, Jianwen.
In: Applied Soil Ecology, Vol. 201, 105503, 2024.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Bacillus velezensis SQR9-induced ammonia-oxidizing bacteria stimulate gross nitrification rates in acidic soils
AU - Huang, Mengyuan
AU - Zhang, Yihe
AU - Yu, Qidong
AU - Qian, Siyan
AU - Shi, Yue
AU - Zhang, Nan
AU - Michelsen, Anders
AU - Zhang, Jinbo
AU - Müller, Christoph
AU - Li, Shuqing
AU - Zhang, Ruifu
AU - Shen, Qirong
AU - Zou, Jianwen
N1 - Publisher Copyright: © 2024 Elsevier B.V.
PY - 2024
Y1 - 2024
N2 - 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.
AB - 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.
KW - Ammonia-oxidizing bacteria
KW - Mineralization
KW - N transformation
KW - Nitrification
KW - Plant growth-promoting microbe
U2 - 10.1016/j.apsoil.2024.105503
DO - 10.1016/j.apsoil.2024.105503
M3 - Journal article
AN - SCOPUS:85197077043
VL - 201
JO - Agro-Ecosystems
JF - Agro-Ecosystems
SN - 0167-8809
M1 - 105503
ER -
ID: 397798199