Details

Autor(en) / Beteiligte

• Huang, Mengyuan
• Zhang, Yihe
• Wu, Jie
• Wang, Yuxin
• Xie, Yuxin
• Geng, Yajun
• Zhang, Nan
• Michelsen, Anders
• Li, Shuqing
• Zhang, Ruifu
• Shen, Qirong
• Zou, Jianwen

Titel

Bacillus velezensis SQR9 inhibition to fungal denitrification responsible for decreased N2O emissions from acidic soils

Ist Teil von

• The Science of the total environment, 2023-08, Vol.885, p.163789-163789, Article 163789

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

2023

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Tropical and subtropical acidic soils are hotspots of global terrestrial nitrous oxide (N2O) emissions, with N2O produced primarily through denitrification. Plant growth-promoting microbes (PGPMs) may effectively mitigate soil N2O emissions from acidic soils, achieved through differential responses of bacterial and fungal denitrification to PGPMs. To test this hypothesis, we conducted a pot experiment and the associated laboratory trials to gain the underlying insights into the PGPM Bacillus velezensis strain SQR9 effects on N2O emissions from acidic soils. SQR9 inoculation significantly reduced soil N2O emissions by 22.6–33.5 %, dependent on inoculation dose, and increased the bacterial AOB, nirK and nosZ genes abundance, facilitating the reduction of N2O to N2 in denitrification. The relative contribution of fungi to the soil denitrification rate was 58.4–77.1 %, suggesting that the N2O emissions derived mainly from fungal denitrification. The SQR9 inoculation significantly inhibited the fungal denitrification and down-regulated fungal nirK gene transcript, dependent on the SQR9 sfp gene, which was necessary for secondary metabolite synthesis. Therefore, our study provides new evidence that decreased N2O emissions from acidic soils can be due to fungal denitrification inhibited by PGPM SQR9 inoculation. [Display omitted] •Plant growth-promoting microbes decrease N2O emissions from acidic soils.•Fungi dominate denitrification process in acidic soils.•Fungal denitrification and fungal nirK inhibition result in N2O mitigation.•SQR9 sfp gene regulates antagonism against fungi to decrease fungal N2O emissions.•SQR9 increases nosZ to facilitate N2O reduction in bacterial denitrification.