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Partial mycoheterotrophy in Pyroleae: nitrogen and carbon stable isotope signatures during development from seedling to adult
Department of Ecology, Environment and Plant Sciences, Stockholm University, Stockholm, Sweden.
Örebro University, School of Science and Technology.
Örebro University, School of Science and Technology.ORCID iD: 0000-0003-4384-5014
Department of Ecology, Environment and Plant Sciences, Stockholm University, Stockholm, Sweden.
2015 (English)In: Oecologia, ISSN 0029-8549, E-ISSN 1432-1939, Vol. 177, no 1, p. 203-211Article in journal (Refereed) Published
Abstract [en]

Mycoheterotrophic plants (MHP) are divided into non-photosynthesizing full MHP and green-leaved partial or initial MHP. We investigated 13C and 15N isotope enrichment in five putatively partial MHP species in the tribe Pyroleae (Ericaceae): Chimaphila umbellata, Moneses uniflora, Orthilia secunda, Pyrola chlorantha and Pyrola minor, sampled from forest sites on Öland, Sweden. For M. uniflora and P. chlorantha, we investigated isotope signatures of subterranean seedlings (which are mycoheterotrophic), to examine how the use of seedlings instead of full MHP species (Hypopitys monotropa) as reference species affects the assessment of partial mycoheterotrophy. Our main findings were as follows: (1) All investigated Pyroleae species were enriched in 15N compared to autotrophic reference plants. (2) significant fungal-derived C among the Pyroleae species was found for O. secunda and P. chlorantha. For the remaining species of C. umbellata, M. uniflora and P. minor, isotope signatures suggested adult autotrophy. (3) C and N gains, calculated using seedlings as a full MHP reference, yielded qualitatively similar results as when using H. monotropa as a reference. However, the estimated differences in C and N gains became larger when using seedlings as an MHP reference. (4) A previously unknown interspecific variation in isotope signature occurs during early ontogeny, from seed production to developing seedlings. Our findings suggest that there is a variation among Pyroleae species concerning partial mycoheterotrophy in adults. Adult autotrophy may be most common in Pyroleae species, and these species may not be as dependent on fungal-derived nutrients as some green orchids.

Place, publisher, year, edition, pages
Springer Berlin/Heidelberg, 2015. Vol. 177, no 1, p. 203-211
Keywords [en]
Dust seeds, Ericaceae, Mycoheterotrophy, Stable isotopes, Subterranean seedlings
National Category
Ecology
Research subject
Plant Ecology
Identifiers
URN: urn:nbn:se:oru:diva-42005DOI: 10.1007/s00442-014-3137-xISI: 000347406500019PubMedID: 25395312OAI: oai:DiVA.org:oru-42005DiVA, id: diva2:781441
Funder
Swedish Research Council
Note

We dedicate this paper to the memory of our friend and colleague Ania Mikusinska, who tragically passed away during the preparation of the manuscript.

Available from: 2014-11-28 Created: 2015-01-16 Last updated: 2017-12-05Bibliographically approved

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Mikusinska, AniaEkblad, Alf

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