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Limited carbon and mineral nutrient gain from mycorrhizal fungi by adult Australian orchids

Titelangaben

Sommer, Janine ; Pausch, Johanna ; Brundrett, Mark C. ; Dixon, Kingsley W. ; Bidartondo, Martin I. ; Gebauer, Gerhard:
Limited carbon and mineral nutrient gain from mycorrhizal fungi by adult Australian orchids.
In: American Journal of Botany. Bd. 99 (2012) Heft 7 . - S. 1133-1145.
ISSN 1537-2197
DOI: https://doi.org/10.3732/ajb.1100575

Abstract

Premise of the study: In addition to autotrophic and fully mycoheterotrophic representatives, the orchid family comprises species that at maturity obtain C and N partially from fungal sources. These partial mycoheterotrophs are often associated with fungi that simultaneously form ectomycorrhizas with trees. This study investigates mycorrhizal nutrition for orchids from the southwest Australian biodiversity hotspot.
Methods: The mycorrhizal fungi of 35 green and one achlorophyllous orchid species were analysed using molecular methods. Nutritional mode was identified for 27 species by C and N isotope abundance analysis in comparison to non-orchids from the same habitat. As a complementary approach, 13CO2 pulse labelling was applied to a subset of six orchid species to measure photosynthetic capacity.
Key results: Almost all orchids associate with rhizoctonia-forming fungi. Due to much higher than expected variation within the co-occurring non-orchid reference plants, the stable isotope approach proved challenging for assigning most orchids to a specialised nutritional mode and therefore these orchids were classified as autotrophic at maturity. The 13CO2 pulse labelling confirmed full autotrophy for six selected species. Nonetheless, at least three orchid species (Gastrodia lacista, Prasophyllum elatum, Corybas recurvus) were identified as nutritionally distinctive from autotrophic orchids and reference plants.
Conclusions: Despite an orchid-rich flora, among southwest Australian orchids partial mycoheterotrophy is less common than in other parts of the world, most likely because most associate with saprotrophic fungi rather than ectomycorrhizal fungi.

Weitere Angaben

Publikationsform: Artikel in einer Zeitschrift
Begutachteter Beitrag: Ja
Zusätzliche Informationen: BAYCEER107882
Institutionen der Universität: Fakultäten
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften > Juniorprofessur Agrarökologie
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften > Juniorprofessur Agrarökologie > Juniorprofessur Agrarökologie - Juniorprof. Dr. Johanna Pausch
Forschungseinrichtungen
Forschungseinrichtungen > Forschungszentren
Forschungseinrichtungen > Forschungszentren > Bayreuther Zentrum für Ökologie und Umweltforschung - BayCEER
Titel an der UBT entstanden: Ja
Themengebiete aus DDC: 500 Naturwissenschaften und Mathematik
Eingestellt am: 14 Jul 2015 06:21
Letzte Änderung: 31 Jan 2018 13:41
URI: https://eref.uni-bayreuth.de/id/eprint/16262