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15N and 13C natural abundance of autotrophic and mycoheterotrophic orchids provides insight into nitrogen and carbon gain from fungal association

Title data

Gebauer, Gerhard ; Meyer, M.:
15N and 13C natural abundance of autotrophic and mycoheterotrophic orchids provides insight into nitrogen and carbon gain from fungal association.
In: New Phytologist. Vol. 160 (2003) Issue 1 . - pp. 209-223.
ISSN 1469-8137
DOI: https://doi.org/10.1046/j.1469-8137.2003.00872.x

Abstract in another language

Whereas mycorrhizal fungi are acknowledged to be the sources of nitrogen (N) and carbon (C) in achlorophyllous (myco-heterotrophic) orchids, the sources of these elements in autotrophic orchids are unknown. We have determined the stable isotope abundance of N and C to quantify their gain from different sources in these two functional groups and in non-orchids of distinctive mycorrhizal types. Leaves of each plant were collected from four forest and four grassland sites in Europe. The N and C isotope abundance, and total N concentrations of their tissues and of associated soils were determined.Myco-heterotrophic orchids were significantly more enriched in 15N (epsilon(MHO-R) 11.5o/oo) and 13C (epsilon(MHO-R) = 8.4o/oo.) than co-occurring non-orchids. delta15N and delta13C signatures of autotrophic orchids ranged from values typical of non-orchids to those more representative of myco-heterotrophic orchids.Utilization of fungi-derived N and C probably explains the relative 15N and 13C enrichment in the myco-heterotrophs. A linear two-source isotopic mixing model was used to estimate N and C gain of autotrophic orchids from their fungal associates. Of the putatively autotrophic species, Cephalanthera damasonium obtained the most N and C by the fungal route, but several other species also fell into the partially myco-heterotrophic category.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: BAYCEER25832
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Biology > Chair Plant Ecology
Research Institutions > Research Centres > Bayreuth Center of Ecology and Environmental Research- BayCEER
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Biology
Research Institutions
Research Institutions > Research Centres
Result of work at the UBT: Yes
DDC Subjects: 500 Science
Date Deposited: 11 Sep 2015 06:34
Last Modified: 11 Sep 2015 06:34
URI: https://eref.uni-bayreuth.de/id/eprint/19270