Phosphorus Fertilization of an Ultramafic Soil Reduced Effects of Arbuscular Mycorrhizal Fungi but not Mycorrhizal Colonization

Arbuscular mycorrhizal fungi (AMF) are generally involved in the adaptation of native plants to ultramafic soils, especially New Caledonia. These soils deficient major elements, particularly phosphorus (P), and rich potentially toxic metals such as nickel, chromium, cobalt, manganese. We aimed test effects increasing P doses on functions grown P-deficient soil. analyzed soil fertilization growth, mineral nutrition metal absorption inoculated or not with AMF isolates. Three endemic frequently used ecological restoration were tested: Metrosideros laurifolia (Myrtaceae), Alphitonia neocaledonica (Rhamnaceae), Tetraria comosa (Cyperaceae). They pots supplied different P, after being AMF. increased greatly growth rate all three species. In non-supplied only M. showed a higher when AMF, but plant species positive symbiosis, better nutrition, for potassium (K) calcium calcium/magnesium values (Ca/Mg). Mycorrhizal colonization was reduced by supply, specific suppressed. Negative induced without reduction colonization. As adaptive traits obtained their rate, we hypothesized that high increase this could have altered structure.