期刊
NEW PHYTOLOGIST
卷 231, 期 5, 页码 2002-2014出版社
WILEY
DOI: 10.1111/nph.17459
关键词
epiphytism; fungal guilds; fungal spatial distribution; metabarcoding; orchid mycorrhizal fungi; Tulasnellaceae
资金
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq)
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior - Brasil (CAPES) [001]
- Fundacao de Amparo a Pesquisa do Estado de Minas Gerais (FAPEMIG)
- Agence Nationale de la Recherche [ANR-19-CE02-0002]
The study revealed spatial structure of fungal communities on bark, influenced by epiphytic plant roots, showing positive spatial autocorrelation and distance decay of similarity with roots. This suggests the existence of an epiphytic rhizosphere and aggregation of orchid mycorrhizal fungi around them due to reciprocal influence between the mycorrhizal partners.
Approximately 10% of vascular plants are epiphytes and, even though this has long been ignored in past research, are able to interact with a variety of fungi, including mycorrhizal taxa. However, the structure of fungal communities on bark, as well as their relationship with epiphytic plants, is largely unknown. To fill this gap, we conducted environmental metabarcoding of the ITS-2 region to understand the spatial structure of fungal communities of the bark of tropical trees, with a focus on epiphytic orchid mycorrhizal fungi, and tested the influence of root proximity. For all guilds, including orchid mycorrhizal fungi, fungal communities were more similar when spatially close on bark (i.e. they displayed positive spatial autocorrelation). They also showed distance decay of similarity with respect to epiphytic roots, meaning that their composition on bark increasingly differed, compared to roots, with distance from roots. We first showed that all of the investigated fungal guilds exhibited spatial structure at very small scales. This spatial structure was influenced by the roots of epiphytic plants, suggesting the existence of an epiphytic rhizosphere. Finally, we showed that orchid mycorrhizal fungi were aggregated around them, possibly as a result of reciprocal influence between the mycorrhizal partners.
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