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The relationship between the effects of AMF on Asclepias (A) above-ground (AG) and below-ground (BG) biomass and (B) total cardenolide concentration. Effects are calculated as mycorrhizal (m) minus non-mycorrhizal (nm) values. Each point represents the average effect of AMF for one of eight species of Asclepias. PGLS regression lines are shown, and the solid line indicates that the regression is significant at p < 0.05.
