Rapid turnover of hyphae of mycorrhizal fungi determined by AMS microanalysis of 14C.
作者： P. L. Staddon
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摘要: Processes in the soil remain among least well-characterized components of carbon cycle. Arbuscular mycorrhizal (AM) fungi are ubiquitous root symbionts many terrestrial ecosystems and account for a large fraction photosynthate wide range ecosystems; they therefore play key role A part fungal mycelium is outside (the extraradical mycelium, ERM) and, because dispersed growth pattern small diameter hyphae (<5 micrometers), exceptionally difficult to study quantitatively. Critically, longevity these fine has never been measured, although it assumed be short. To quantify turnover hyphae, we exposed plants fossil ("carbon-14-dead") dioxide collected samples ERM (up 116 micrograms) over following 29 days. Analyses their carbon-14 content by accelerator mass spectrometry (AMS) showed that most AM live, on average, 5 6 This high rate reveals rapid pathway
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