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Tuber melanosporum shapes nirStype and ammonia-oxidizing bacterial communities in Carya illinoinensis ectomycorrhizosphere soils

文献类型： 外文期刊

作者： Kang, Zongjing 1 ; Zou, Jie 1 ; Huang, Yue 1 ; Zhang, Xiaoping 1 ; Ye, Lei 1 ; Zhang, Bo 1 ; Li, Xiaolin 1 ;

作者机构： 1.Sichuan Acad Agr Sci, Soil & Fertilizer Inst, Chengdu, Peoples R China

2.Sichuan Agr Univ, Coll Resources, Dept Microbiol, Chengdu, Peoples R China

关键词： Tuber melanosporum; Carya illinoinensis; nirS-type denitrifying bacteria; Ammonia-oxidizing bacteria; Ectomycorrhizosphere soils

期刊名称：PEERJ （ 影响因子：2.984； 五年影响因子：3.369 ）

ISSN： 2167-8359

年卷期： 2020 年 8 卷

页码：

收录情况： SCI

摘要： Background. NirS-type denitrifying bacteria and ammonia-oxidizing bacteria (AOB) play a key role in the soil nitrogen cycle, which may affect the growth and development of underground truffles. We aimed to investigate nirS-type denitrifying bacterial and AOB community structures in the rhizosphere soils of Carya illinoinensis seedlings inoculated with the black truffle (Tuber melanosporum) during the early symbiotic stage. Methods. The C. illinoinensis seedlings inoculated with or without T. melanosporum were cultivated in a greenhouse for six months. Next-generation sequencing (NGS) technology was used to analyze nirS-type denitrifying bacterial and AOB community structures in the rhizosphere soils of these seedlings. Additionally, the soil properties were determined. Results. The results indicated that the abundance and diversity of AOB were significantly reduced due to the inoculation of T. melanosporum, while these of nirS-type denitrifying bacteria increased significantly. Proteobacteri a were the dominant bacterial groups, and Rhodanobacter, Pseudomonas, Nitrosospira and Nitrosomonas were the dominant classified bacterial genera in all the soil samples. Pseudomonas was the most abundant classified nirS-type denitrifying bacterial genus in ectomycorrhizosphere soils whose relative abundance could significantly increase after T. melanosporum inoculation. A large number of unclassified nirS-type denitrifying bacteria and AOB were observed. Moreover, T. melanosporum inoculation had little effect on the pH, total nitrogen (TN), nitrate-nitrogen (NO3--N) and ammonium-nitrogen (NH4+-N) contents in ectomycorrhizosphere soils. Overall, our results showed that nirStype denitrifying bacterial and AOB communities in C. illinoinensis rhizosphere soils were significantly affected by T. melanosporum on the initial stage of ectomycorrhizal symbiosis, without obvious variation of soil N contents.

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