Summary
This controlled study examined how plants regulate resource exchange with arbuscular mycorrhizal fungi (AMF) when presented with partners of differing cooperativeness. Using split-root systems and dual isotopic tracing, the researchers found that plants increased phosphorus uptake from less cooperative fungal partners when alternative options were available, thereby reducing the carbon cost per unit phosphorus acquired. The findings suggest that AMF diversity itself promotes more equitable mutualistic exchange, potentially explaining the evolutionary persistence of this ancient symbiosis.
UK applicability
These fundamental insights into plant-AMF cooperation mechanisms are relevant to UK arable and horticultural systems, where soil inoculant or diversity enhancement strategies are increasingly considered for sustainable phosphorus management. However, the study was conducted in controlled laboratory conditions and would require field validation under UK soil and climate conditions to inform practical farming recommendations.
Key measures
³³P and ¹⁴C isotope allocation; phosphorus transfer rates; carbon allocation ratios; cooperative versus non-cooperative AMF partner performance
Outcomes reported
The study measured phosphorus (³³P) and carbon (¹⁴C) allocation between plants and two co-occurring arbuscular mycorrhizal fungal species differing in cooperativeness using isotopic tracing in a split-root experimental system. Plants receiving phosphorus from less cooperative AMF fungi showed reduced carbon costs per unit of phosphorus acquired when alternative fungal partners were available.
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