The role of mycorrhizal infection in the resistance of Vaccinium macro
carpon to manganese was investigated in perlite culture containing nut
rient solution amended with Mn at 0, 250, 500 or 1000 mu g/ml. Shoot a
nd root dry weights of the mycorrhizal plants were higher than nonmyco
rrhizal plants. The mycorrhizal plants produced significantly longer m
ain roots than the nonmycorrhizal plants. Differences between shoot an
d root Mn concentrations of mycorrhizal and nonmycorrhizal plants aros
e by reduction of Mn in the leaves of mycorrhizal plants and a corresp
onding increase in root tissues.