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Cephalanthera longifolia (Neottieae, Orchidaceae) is mixotrophic: a comparative study between green and non-photosynthetic individuals

Title data

Abadie, Jean-Claude ; Püttsepp, Ülle ; Gebauer, Gerhard ; Faccio, Antonella ; Bonfante, Paola ; Selosse, Marc-André:
Cephalanthera longifolia (Neottieae, Orchidaceae) is mixotrophic: a comparative study between green and non-photosynthetic individuals.
In: Canadian Journal of Botany. Vol. 84 (2006) . - pp. 1462-1477.
ISSN 1480-3305

Abstract in another language

We investigated an Estonian population of the orchid Cephalanthera longifolia (L.) Fritsch. (Neottieae tribe), which harbours green and achlorophyllous individuals (= albinos), to understand albino survival and compare mycorrhizal associates, development, and nutrition of the two phenotypes. Albinos never changed phenotype over 14 years and had development similar to green individuals; their chlorophyll content was reduced by 99.4%, making them heterotrophic. Molecular typing by polymerase chain reaction amplification of fungal intergenic transcribed spacer and microscopic analyses showed that Thelephoraceae (Basidiomycetes, usually forming ectomycorrhizae with trees) were mycorrhizal on both phenotypes. Molecular typing also demonstrated that additional fungi were present on roots, including many endophytes (such as Helotiales) and various ectomycorrhizal taxa, whose role and pattern of colonization remained unclear. Mycorrhizal colonization was increased in albinos by about twofold, but no obvious difference in fungal partners compared with green individuals was demonstrated. Analysis of stable isotope composition (N and C) showed that albinos were dependent on their fungi for carbon (mycoheterotrophy), while green individuals recovered 33% of their carbon from fungi (mixotrophy). Surrounding trees, which formed ectomycorrhizae with at least one Thelephoraceae found in orchids, were likely the ultimate carbon source. These data are discussed in the framework of evolution of mycoheterotrophy in orchids, especially in Neottieae.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: BAYCEER39435
Institutions of the University: Research Institutions > Research Centres > Bayreuth Center of Ecology and Environmental Research- BayCEER
Research Institutions
Research Institutions > Research Centres
Result of work at the UBT: Yes
DDC Subjects: 500 Science
Date Deposited: 13 Aug 2015 06:11
Last Modified: 13 Aug 2015 06:11