Abstract
Summary 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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Claims 7
Claim · model-written summary
AMF supplied a larger share of shoot phosphorus in high-phosphorus soil communities.
Not reportedTaxon
Verbatim
e0“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”
Claim · model-written summary
Carbon allocation to AMF was similar in roots and soil across soil phosphorus communities.
Not reportedTaxon
Verbatim
e0“despite similar 13 C allocation to AMF in roots and soil”
Claim · model-written summary
AMF carbon concentration was higher in grass roots than blanketflower roots.
Verbatim
e0“13 C concentration in AMF was consistently higher in grass than in blanketflower ( Gaillardia aristata Pursh) roots”
Claim · model-written summary
AMF taxa composition differed between grass and blanketflower roots.
Not reportedTaxonDirection
Verbatim
e0“This coincided with differences in AMF taxa composition”
Claim · model-written summary
Grass roots tended to have more vesicles and fewer arbuscules.
- Taxon
- grasse0
- Organ / stage
- rootse0
- Outcome
- more vesicles (storage structures) but fewer arbuscules (exchange structures)e0
Not reportedDirection
Verbatim
e0“a trend of more vesicles (storage structures) but fewer arbuscules (exchange structures) in grass roots”
Claim · model-written summary
Phosphorus-for-carbon exchange ratios increased with soil phosphorus for blanketflower.
- Taxon
- blanketflower
Gaillardia aristatae0 - Outcome
- 32 P‐for‐ 13 C exchange ratiose0
- Direction
- increasede0
- Setting
- soil Pe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“32 P‐for‐ 13 C exchange ratios increased with soil P for blanketflower”
Claim · model-written summary
Phosphorus-for-carbon exchange ratios did not increase with soil phosphorus for grasses.
Verbatim
e0“32 P‐for‐ 13 C exchange ratios increased with soil P for blanketflower but not grasses”