Carbon for nutrient exchange between Lycopodiella inundata and Mucoromycotina fine root endophytes is unresponsive to high atmospheric CO2

Abstract Non-vascular plants associating with arbuscular mycorrhizal (AMF) and Mucoromycotina ‘fine root endophyte’ (MFRE) fungi derive greater benefits from their fungal associates under higher atmospheric [CO 2 ] (a[CO ]) than ambient; however, nothing is known about how changes in a[CO affect MFRE function vascular plants. We measured movement of phosphorus (P), nitrogen (N) carbon (C) between the lycophyte Lycopodiella inundata fine endophyte using 33 P-orthophosphate, 15 N-ammonium chloride 14 CO isotope tracers ambient elevated concentrations 440 800 ppm, respectively. Transfers P N to were unaffected by ]. There was a slight increase C transfer Our results demonstrate that exchange C-for-nutrients plant FRE largely Unravelling role host nutrition potential C-for-N trade symbionts different abiotic conditions imperative further our understanding past, present future roles plant-fungal symbioses ecosystems.