期刊
ECOLOGY LETTERS
卷 8, 期 12, 页码 1264-1270出版社
WILEY-BLACKWELL
DOI: 10.1111/j.1461-0248.2005.00831.x
关键词
arbuscular mycorrhiza; bacteria; (13)C; carbon cycling; Glomus intraradices; Plantago lanceolata; signature fatty acids; stable isotope
类别
Turnover rates of arbuscular mycorrhizal (AM) fungi may influence storage of soil organic carbon (SOC). We examined the longevity of AM hyphae in monoxenic cultures; and we also used (13)C incorporation into signature fatty acids to study C dynamics in a mycorrhizal symbiosis involving Glomus intraradices and Plantago lanceolata. (13)C enrichment of signature fatty acids showed rapid transfer of plant assimilates to AM fungi and a gradual release of C from roots to rhizosphere bacteria, but at a much slower rate. Furthermore, most C assimilated by AM fungi remained 32 days after labelling. These findings indicate that (13)C labelled fatty acids can be used to track C flux from the atmosphere to the rhizosphere and that retention of C in AM fungal mycelium may contribute significantly to SOC.
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