Isotopic evidence indicates saprotrophy in post-fire Morchella in Oregon and Alaska
作者： Erik A. Hobbie , Samuel F. Rice , Nancy S. Weber , Jane E. Smith
DOI: 10.3852/15-281
关键词: Botany 、 Radiocarbon dating 、 Fungus 、 Geopyxis carbonaria 、 Stable isotope ratio 、 Plicaria 、 Biology 、 Plicaria endocarpoides 、 Morchella 、 Litter
摘要: We assessed the nutritional strategy of true morels (genus Morchella) collected in 2003 and 2004 Oregon Alaska, 1 or 2 y after forest fires. hypothesized that patterns stable isotopes (δ(13)C δ(15)N) sporocarps would match those saprotrophic fungi radiocarbon (Δ(14)C) analyses indicate Morchella was assimilating old carbon not current-year photosynthate. compared with values from concurrently foliage, ectomycorrhizal Geopyxis carbonaria (Alb. & Schwein.) Sacc., Plicaria endocarpoides (Berk.) Rifai, literature to determine isotopic for fungi. Geopyxis, Morchella, respectively, were 3‰, 5‰ 6‰ higher 13C than foliage 5‰, 7‰ (15)N. High (15)N enrichment indicated recent litter primary source nitrogen, similar (13)C enrichments suggest assimilates its nitrogen same pool as this fungus. From averaged 11 ± 6 (n = 19), 17 5 3), 8) 1) resembled Δ(14)C. conclude fruiting post-fire environments our study assimilated saprotrophic.
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