دورية أكاديمية
Parallel evolutionary paths to mycoheterotrophy in understorey Ericaceae and Orchidaceae: ecological evidence for mixotrophy in Pyroleae.
| العنوان: | Parallel evolutionary paths to mycoheterotrophy in understorey Ericaceae and Orchidaceae: ecological evidence for mixotrophy in Pyroleae. |
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| المؤلفون: | Tedersoo L; Institute of Botany and Ecology, University of Tartu, 40 Lai Str., 51005, Tartu, Estonia. leho.tedersoo@ut.ee, Pellet P, Kõljalg U, Selosse MA |
| المصدر: | Oecologia [Oecologia] 2007 Mar; Vol. 151 (2), pp. 206-17. Date of Electronic Publication: 2006 Nov 07. |
| نوع المنشور: | Journal Article; Research Support, Non-U.S. Gov't |
| اللغة: | English |
| بيانات الدورية: | Publisher: Springer Country of Publication: Germany NLM ID: 0150372 Publication Model: Print-Electronic Cited Medium: Print ISSN: 0029-8549 (Print) Linking ISSN: 00298549 NLM ISO Abbreviation: Oecologia Subsets: MEDLINE |
| أسماء مطبوعة: | Original Publication: Berlin ; New York, Springer. |
| مواضيع طبية MeSH: | Biological Evolution* , Symbiosis*, Basidiomycota/*physiology , Ericaceae/*physiology , Mycorrhizae/*physiology , Orchidaceae/*physiology , Plant Roots/*microbiology , Pyrolaceae/*physiology, Adaptation, Biological/physiology ; Basidiomycota/genetics ; Carbon Isotopes/metabolism ; DNA, Intergenic/genetics ; Estonia ; Nitrogen Isotopes/metabolism |
| مستخلص: | Several forest understorey achlorophyllous plants, termed mycoheterotrophs (MHs), obtain C from their mycorrhizal fungi. The latter in turn form ectomycorrhizas with trees, the ultimate C source of the entire system. A similar nutritional strategy occurs in some green forest orchids, phylogenetically close to MH species, that gain their C via a combination of MH and photosynthesis (mixotrophy). In orchid evolution, mixotrophy evolved in shaded habitats and preceded MH nutrition. By generalizing and applying this to Ericaceae, we hypothesized that green forest species phylogenetically close to MHs are mixotrophic. Using stable C isotope analysis with fungi, autotrophic, mixotrophic and MH plants as comparisons, we found the first quantitative evidence for substantial fungi-mediated mixotrophy in the Pyroleae, common ericaceous shrubs from boreal forests close to the MH Monotropoideae. Orthilia secunda, Pyrola chlorantha, Pyrola rotundifolia and Chimaphila umbellata acquired between 10.3 and 67.5% of their C from fungi. High N and 15N contents also suggest that Pyroleae nutrition partly rely on fungi. Examination of root fungal internal transcribed spacer sequences at one site revealed that 39 species of mostly endophytic or ectomycorrhizal fungi, including abundant Tricholoma spp., were associated with O. secunda, P. chlorantha and C. umbellata. These fungi, particularly ectomycorrhizal associates, could thus link mixotrophic Pyroleae spp. to surrounding trees, allowing the C flows deduced from isotopic evidence. These data suggest that we need to reconsider ecological roles of understorey plants, which could influence the dynamics and composition of forest communities. |
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| المشرفين على المادة: | 0 (Carbon Isotopes) 0 (DNA, Intergenic) 0 (Nitrogen Isotopes) |
| تواريخ الأحداث: | Date Created: 20061108 Date Completed: 20070815 Latest Revision: 20181113 |
| رمز التحديث: | 20221213 |
| DOI: | 10.1007/s00442-006-0581-2 |
| PMID: | 17089139 |
| قاعدة البيانات: | MEDLINE |
Find this article in full text from Springer Verlag. 
Full Text Finder | تدمد: | 0029-8549 |
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| DOI: | 10.1007/s00442-006-0581-2 |