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Photosynthetic Mediterranean meadow orchids feature partial mycoheterotrophy and specific mycorrhizal associations

Title data

Girlanda, Mariangela ; Segreto, Rossana ; Cafasso, Donata ; Liebel, Heiko T. ; Rodda, Michele ; Ercole, Enrico ; Cozzolino, Salvatore ; Gebauer, Gerhard ; Perotto, Silvia:
Photosynthetic Mediterranean meadow orchids feature partial mycoheterotrophy and specific mycorrhizal associations.
In: American Journal of Botany. Vol. 98 (2011) Issue 7 . - pp. 1148-1163.
ISSN 1537-2197

Abstract in another language

● Premise of the study: We investigated whether four widespread, photosynthetic Mediterranean meadow orchids (Ophrys fuciflora, Anacamptis laxiflora, Orchis purpurea and Serapias vomeracea) had either nutritional dependency on mycobionts or mycorrhizal fungal specificity. Nonphotosynthetic orchids generally engage in highly specific interactions with fungal symbionts that provide them with organic carbon. By contrast, fully photosynthetic orchids in sunny, meadow habitats have been considered to lack mycorrhizal specificity.● Methods: We performed both culture-dependent and culture-independent ITS sequence analysis to identify fungi from orchid roots. By analyzing stable isotope (13C and 15N) natural abundances, we also determined the degree of autotrophy and mycoheterotrophy in the four orchid species.● Key results: Phylogenetic and multivariate comparisons indicated that Or. purpurea and Oph. fuciflora featured lower fungal diversity and more specific mycobiont spectra than A. laxiflora and S. vomeracea. All orchid species were significantly enriched in 15N compared with neighboring non-orchid plants. O. purpurea had the most pronounced N gain from fungi and differed from the other orchids in also obtaining C from fungi.● Conclusions: These results indicated that even in sunny Mediterranean meadows, orchids may be mycoheterotrophic, with correlated mycorrhizal fungal specificity.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: BAYCEER95474
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: 29 Jul 2015 05:53
Last Modified: 29 Jul 2015 05:53