Symbiotic fungi undergo a taxonomic and functional bottleneck during orchid seeds germination: a case study on Dendrobium moniliforme

Yuan-Yuan Meng , Xu-Li Fan , Lv-Rong Zhou , Shi-Cheng Shao , Qiang Liu , Marc-Andre Selosse , Jiang-Yun Gao


In many germinating orchids that rely on fungal partners for their nutrition, fungal diversity decreases during development. We document this pattern in the in situ development of Dendrobium moniliforme, where the diversity of cultivable Tulasnella species drops from the early germinating stage (6 Tulasnella species) to that of emergence of the second leaf (2 species), with species discontinuance and no new species appearing. We investigated the functional aspects of this decay by germinating seeds in vitro with the different strains available and observed, over 60 and 120 days, a perfect match between the stages at which Tulasnella spp. occur in situ and the ability to support in vitro development to this stage. The taxonomic bottleneck during germination may result, at least in D. moniliforme, from inability of the fungus to support seedling growth beyond a specific stage. Moreover, the isolated Tulasnella strains that best supported D. moniliforme development did not cluster together phylogenetically. Thus, the interaction between partners, rather than intrinsic fungal traits, may be involved in bottleneck of fungal symbionts during orchid germination.
Author Yuan-Yuan Meng
Yuan-Yuan Meng,,
, Xu-Li Fan
Xu-Li Fan,,
, Lv-Rong Zhou
Lv-Rong Zhou,,
, Shi-Cheng Shao
Shi-Cheng Shao,,
, Qiang Liu
Qiang Liu,,
, Marc-Andre Selosse (FB / DPTNC)
Marc-Andre Selosse,,
- Department of Plant Taxonomy and Nature Conservation
, Jiang-Yun Gao
Jiang-Yun Gao,,
Journal seriesSymbiosis, ISSN 0334-5114, e-ISSN 1878-7665, (N/A 70 pkt)
Issue year2019
Publication size in sheets0.5
Keywords in EnglishMicrospermy, mycoheterotrophy, partner compatibility, protocorm, symbiotic germination, Tulasnella
ASJC Classification1100 General Agricultural and Biological Sciences
Languageen angielski
Score (nominal)70
Score sourcejournalList
ScoreMinisterial score = 70.0, 03-03-2020, ArticleFromJournal
Publication indicators WoS Citations = 0; Scopus SNIP (Source Normalised Impact per Paper): 2016 = 0.835; WoS Impact Factor: 2018 = 2.009 (2) - 2018=1.793 (5)
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