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N-induced root exudates mediate the rhizosphere fungal assembly and affect species coexistence
Wang, Jie1; Liao, Lirong2; Wang, Guoliang1; Liu, Hongfei3,4; Wu, Yang3; Liu, Guobin2; Zhang, Chao1
2022-01-15
Source PublicationSCIENCE OF THE TOTAL ENVIRONMENT
ISSN0048-9697
Volume804Pages:13
Corresponding AuthorZhang, Chao(zhangchaolynn@163.com)
AbstractRoot exudates play essential roles in shaping root-associated microbial communities in plant-soil systems. However, knowledge regarding the influence of root exudates on soil communities, particularly concerning their assembly processes and species coexistence patterns, remains limited. In this study, we performed a 20-month pot experiment using a nitrogen (N) addition gradient (0, 2.5, 5, 7.5, 10, and 15 g N m(-2) yr(-1)), amplicon sequencing, and metabolomics to investigate the effect of short-term N addition on the assembly process and species coexistence of fungal communities, as well as their association with root exudates in the rhizosphere and bulk soils around Bothriochloa ischaemum. The results demonstrated that short-term N addition led to distinct differences in the diversity, composition, assembly process, and co-occurrence networks of fungal communities in the rhizosphere and bulk soils. The diversity of fungal communities in the rhizosphere soil increased with the rate of N input and peaked at N10 treatment; this could be correlated with the increased abundance in long-chain organic acids (LCOAs). However, above the threshold N rate of 10 g N m(-2) yr(-1), diversity decreased probably because of the high N-induced inhibitory effect on root exudates (i.e., LCOAs). N addition increased the relative abundance of Sordariomycetes in the rhizosphere and decreased the relative abundance of Mortierellomycetes in the bulk soil, while enhancing the abundance of pathotrophs in both bulk and rhizosphere soils. The rhizosphere fungal community was dominated by a stochastic process at a low N input (N0 and N2.5) and by deterministic processes at a high N input (N10 and N15), which is opposite to the trends in the bulk soil. These fungal assembly processes determine the coexistence of fungal species; deterministic processes lead to less interconnected networks in rhizosphere soils that harbor a more complex network than the bulk soil. Associations between the assembly process and species coexistence in the rhizosphere of B. ischaemum were closely related to the changes in root exudates, such as amino acids, short-chain organic acids, and phenols, which were stimulated by N addition. Collectively, our study emphasizes the key roles of root exudates in the establishment of fungal communities in the plant soil system and furthers our understanding of plant-microbe interactions. (C) 2021 Elsevier B.V. All rights reserved.
KeywordNitrogen addition fungi Species coexistence Stochastic process Deterministic process
DOI10.1016/j.scitotenv.2021.150148
WOS KeywordCOMMUNITY ; SOIL ; NITROGEN ; DIVERSITY ; PHOSPHORUS ; COMPLEXITY ; SUCCESSION ; DEPOSITION ; PATTERNS ; HABITAT
Indexed BySCI
Language英语
Funding ProjectWest Light Foundation of the Chinese Academy of Sciences[XAB2020YN0] ; National Natural Sciences Foundation of China[41771554] ; Natural Science Basic Research Program of Shaanxi Province[2019KJXX-081] ; Natural Science Basic Research Program of Shaanxi Province[2021JM605] ; Chinese Universities Scientifc Fund[2452018336]
Funding OrganizationWest Light Foundation of the Chinese Academy of Sciences ; National Natural Sciences Foundation of China ; Natural Science Basic Research Program of Shaanxi Province ; Chinese Universities Scientifc Fund
WOS Research AreaEnvironmental Sciences & Ecology
WOS SubjectEnvironmental Sciences
WOS IDWOS:000701780900012
PublisherELSEVIER
Citation statistics
Document Type期刊论文
Identifierhttp://ir.igsnrr.ac.cn/handle/311030/165850
Collection中国科学院地理科学与资源研究所
Corresponding AuthorZhang, Chao
Affiliation1.Northwest A&F Univ, State Key Lab Soil Eros & Dryland Farming Loess P, Yangling 712100, Shaanxi, Peoples R China
2.Chinese Acad Sci & Minist Water Resources, Inst Soil & Water Conservat, Yangling 712100, Shaanxi, Peoples R China
3.Northwest A&F Univ, Coll Forestry, Yangling 712100, Shaanxi, Peoples R China
4.Univ Bayreuth, Dept Agroecol, D-95440 Bayreuth, Germany
Recommended Citation
GB/T 7714
Wang, Jie,Liao, Lirong,Wang, Guoliang,et al. N-induced root exudates mediate the rhizosphere fungal assembly and affect species coexistence[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2022,804:13.
APA Wang, Jie.,Liao, Lirong.,Wang, Guoliang.,Liu, Hongfei.,Wu, Yang.,...&Zhang, Chao.(2022).N-induced root exudates mediate the rhizosphere fungal assembly and affect species coexistence.SCIENCE OF THE TOTAL ENVIRONMENT,804,13.
MLA Wang, Jie,et al."N-induced root exudates mediate the rhizosphere fungal assembly and affect species coexistence".SCIENCE OF THE TOTAL ENVIRONMENT 804(2022):13.
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