Orchid mycorrhizal fungi and ascomycetous fungi in epiphytic Vanda falcata roots occupy different niches during growth and development.
Ceratobasidium
Epiphytic orchid
Fungal microbiome
Microbial dynamics
Symbiotic germination
Vanda falcata
Journal
Mycorrhiza
ISSN: 1432-1890
Titre abrégé: Mycorrhiza
Pays: Germany
ID NLM: 100955036
Informations de publication
Date de publication:
Nov 2022
Nov 2022
Historique:
received:
18
01
2022
accepted:
05
07
2022
pubmed:
18
7
2022
medline:
18
10
2022
entrez:
17
7
2022
Statut:
ppublish
Résumé
Epiphytic orchids are commonly found in exposed environments, which plausibly lead to different root fungal community structures from terrestrial orchids. Until recently, few studies have been conducted to show the fungal community structure during the growth of a photosynthetic and epiphytic orchid in its natural growing site. In this study, the Vanda falcata (commonly known as Neofinetia falcata), one of Japan's ornamental orchids, was used to characterize the fungal community structure at different developmental stages. Amplicon sequencing analysis showed that all development stages contain a similar fungal community: Ascomycota dominate half of the community while one-third of the community belongs to Basidiomycota. Rhizoctonia-like fungi, a polyphyletic basidiomycetous fungal group forming mycorrhizas in many orchids, exist even in a smaller portion (around one-quarter) compared to other Basidiomycota members. While ascomycetous fungi exhibit pathogenicity, two Ceratobasidium strains isolated from young and adult plants could initiate seed germination in vitro. It was also found that the colonization of mycorrhizal fungi was concentrated in a part of the root where it directly attaches to the phorophyte bark, while ascomycetous fungi were distributed in the velamen but never colonized cortical cells. Additionally, the root parts attached to the bark have denser exodermal passage cells, and these cells were only colonized by mycorrhizal fungi that further penetrated into the cortical area. Therefore, we confirmed a process that physical regulation of fungal entry to partition the ascomycetes and mycorrhizal fungi results in the balanced mycorrhizal symbiosis in this orchid.
Identifiants
pubmed: 35844010
doi: 10.1007/s00572-022-01089-y
pii: 10.1007/s00572-022-01089-y
doi:
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
481-495Informations de copyright
© 2022. The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.
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