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

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...

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Bibliographic Details
Published in:Symbiosis (Philadelphia, Pa.) Pa.), 2019-11, Vol.79 (3), p.205-212
Main Authors: Meng, Yuan-Yuan, Fan, Xu-Li, Zhou, Lv-Rong, Shao, Shi-Cheng, Liu, Qiang, Selosse, Marc-André, Gao, Jiang-Yun
Format: Article
Language:English
Subjects:
Biomedical and Life Sciences
Dendrobium
Developmental Biology
Ecology
Environmental Sciences
Evolutionary Biology
Fungi
Germination
Life Sciences
Microbiology
Plant Sciences
Seeds
Short Communications
Taxonomy
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Summary: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.
ISSN:0334-5114
1878-7665
DOI:10.1007/s13199-019-00647-x