Dependence of radioisotope data on the relative quality of AMF.

AMF quality was determined as general combining ability (GCA) using diallel analysis, for shoot radio-P (*P) and total shoot P (P). Radioisotope data refer to microcosm halves, i.e. they characterize the C and P exchange that occurs with each AMF species in each plant × AMF species composition. Solid regression lines and closed circles represent compositions without Claroideoglomus claroideum, dashed regression lines and open circles represent compositions with C. claroideum. See Methods for details. Gray area indicates ±1 s.e.