开枪
生物
背景(考古学)
磷
共生
土壤水分
植物
丛枝菌根
丛枝菌根
菌根
农学
生态学
化学
细菌
古生物学
遗传学
有机化学
作者
Ylva Lekberg,Jan Jansa,Morgan Luce McLeod,Mary Ellyn DuPre,William E. Holben,David Johnson,Roger T. Koide,Alanna N. Shaw,Catherine A. Zabinski,Laura Aldrich‐Wolfe
摘要
Phosphorus (P) for carbon (C) exchange is the pivotal function of arbuscular mycorrhiza (AM), but how this exchange varies with soil P availability and among co-occurring plants in complex communities is still largely unknown. We collected intact plant communities in two regions differing c. 10-fold in labile inorganic P. After a 2-month glasshouse incubation, we measured 32 P transfer from AM fungi (AMF) to shoots and 13 C transfer from shoots to AMF using an AMF-specific fatty acid. AMF communities were assessed using molecular methods. AMF delivered a larger proportion of total shoot P in communities from high-P soils despite similar 13 C allocation to AMF in roots and soil. Within communities, 13 C concentration in AMF was consistently higher in grass than in blanketflower (Gaillardia aristata Pursh) roots, that is P appeared more costly for grasses. This coincided with differences in AMF taxa composition and a trend of more vesicles (storage structures) but fewer arbuscules (exchange structures) in grass roots. Additionally, 32 P-for-13 C exchange ratios increased with soil P for blanketflower but not grasses. Contrary to predictions, AMF transferred proportionally more P to plants in communities from high-P soils. However, the 32 P-for-13 C exchange differed among co-occurring plants, suggesting differential regulation of the AM symbiosis.
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