Abstract
Numerous studies of terrestrial orchids have demonstrated widespread partial mycoheterotrophy, particularly the possibility of obtaining organic matter from surrounding trees through a common fungal network. Fungi are also widespread in epiphytic orchid roots, but there have been no attempts to determine if epiphytes accept organic matter from the living stems of their phorophytes. We hypothesise that such transfer does not exist because epiphytes and phorophytes harbour different fungal communities. To test this hypothesis, we tagged three short Randia sp. trees with 13C-enriched CO2 and examined 13C transfer from the phorophyte into the epiphytic orchids Grosourdya appendiculata, Dendrobium oligophyllum and Gastrochilus sp. in Cat Tien National Park, (South Vietnam, Cat Tien National Park, plot size approx. 1 ha). The coincidence of fungal sequences in the orchid roots and in the branches on which they grew was also examined. We did not detect 13C label moving from phorophytes to epiphytes. Using Illumina sequencing, 162 fungal operational taxonomic units (OTUs) were detected. The fungal communities were significantly different between the roots of epiphytes and branches of phorophytes, although no strict fungal specificity at the species level was found in either epiphytes or phorophytes.
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Acknowledgements
We are grateful to the Joint Russian-Vietnamese Tropical Scientific and Technological Centre for organisation and performance of fieldwork.
Funding
This research was supported by the State Assignment of the Tzitzin Main Botanical Garden of the Russian Academy of Sciences # 118021490111-5, at the Unique Scientific Installation Fund Greenhouse. The work of A.K. Eskov and E.V. Abakumov was supported by the Russian Foundation for Basic Research (project 18-04-00677). A.V. Tiunov was supported by the ‘Biodiversity’ program (#41) of the Presidium of the Russian Academy of Sciences. The work of N.G. Prilepsky was supported by a governmental contract of the Lomonosov Moscow State University, # АААА-А16-116021660037-7. V.G. Onipchenko and T.G. Elumeeva thank RNF (#19-14-00038) for financial support.
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Eskov, A.K., Voronina, E.Y., Tedersoo, L. et al. Orchid epiphytes do not receive organic substances from living trees through fungi. Mycorrhiza 30, 697–704 (2020). https://doi.org/10.1007/s00572-020-00980-w
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DOI: https://doi.org/10.1007/s00572-020-00980-w