Isolates of ectomycorrhizal fungi Pisolithus albus were sampled from both ultramafic and volcano-sedimentary soils in New Caledonia, a tropical hotspot of biodiversity, to investigate the relationships between genetic diversity and edaphic constraint through tolerance to nickel (Ni). Careful analyses showed that all isolates belong to P. albus and are closely related to other Australasian specimens. However, the existence of two distinct genetic clusters within P. albus: ultramafic and volcano-sedimentary was identified and supported by the specific mycelia response to Ni toxicity.
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