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Stable isotope signatures of underground seedlings reveal the organic matter gained by adult orchids from mycorrhizal fungi

Title data

Schweiger, Julienne ; Bidartondo, Martin I. ; Gebauer, Gerhard:
Stable isotope signatures of underground seedlings reveal the organic matter gained by adult orchids from mycorrhizal fungi.
In: Functional Ecology. Vol. 32 (April 2018) Issue 4 . - pp. 870-881.
ISSN 1365-2435
DOI: https://doi.org/10.1111/1365-2435.13042

Abstract in another language

1. Orchids produce dust seeds dependent on the provision of organic carbon by mycorrhizal fungi for their early development stages. Hence, all chlorophyllous orchids experience a dramatic switch in trophic strategies from initial mycoheterotrophy to either autotrophy or partial mycoheterotrophy during ontogeny. Yet, the degree to which partially mycoheterotrophic orchids gain carbon from their mycorrhizal fungi is unclear based on existing approaches.2. Here, we propose a novel approach to quantify the fungal-derived organic matter gain of chlorophyllous mature orchids mycorrhizal with rhizoctonia fungi using the stable isotope signatures of their fully mycoheterotrophic (FMH) seedlings in a linear two-source mixing model.3. We conducted a field germination experiment with seven orchid species and measured carbon, nitrogen and hydrogen stable isotope natural abundances and nitrogen concentrations of mature orchids, underground seedlings and autotrophic references.4. After in situ burial for 19 – 30 months, germination rates varied considerably among five orchid species and failed for two. On average, underground seedlings were enriched in 13C and 15N relative to mature orchids and had higher nitrogen concentrations. Using the mean enrichment factors ε13C and ε2H of seedlings as FMH endpoint, the organic matter gain derived by mature orchids from mycorrhizas was ca. 20 %.5. Chlorophyllous orchids mycorrhizal with rhizoctonias are predisposed to partially mycoheterotrophic nutrition due to their initially mycoheterotrophic seedling stage. We show that the carbon and hydrogen isotope abundances of underground seedlings can be used in an improved mixing-model to identify a significant proportion of fungal-derived organic matter in mature orchids.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: BAYCEER144171
Institutions of the University: Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Biology
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Biology > Chair Plant Ecology
Research Institutions
Research Institutions > Research Centres
Research Institutions > Research Centres > Bayreuth Center of Ecology and Environmental Research- BayCEER
Result of work at the UBT: Yes
DDC Subjects: 500 Science
Date Deposited: 03 Jan 2018 08:25
Last Modified: 26 May 2020 11:57
URI: https://eref.uni-bayreuth.de/id/eprint/41106