Arbuscular mycorrhizal status of pioneer plants from the mouth of lake Budi, Araucanía Region, Chile

摘要: Abstract Arbuscular mycorrhizal fungi (AMF) have an important role on the ecosystem stability promoting water and nutrient acquisition by plants allowing their growth under stress conditions including drought salinity. This study aimed at describing colonization of native AMF associated to pioneer plant species growing mouth lake Budi, which receive seasonally marine water. For this, root samples rhizosphere substrate Polygonum maritimum, Carpobrotus chilensis, Ambrosia chamissonis, Ammophyla arenaria were collected analyzed. Mycorrhizal colonization, spore hyphal density, some soil chemical properties (pH, conductivity, organic matter -OM-, microbial activity) determined. Results showed that A. Arenaria presented highest (53%), mycelium (10 m g-1) spores (300 in 100g substrate) densities, highly correlated with elevated OM content (1.64%; r=0.53, r=0.48 y r=0.87, respectively) activity (3.57 µg fluoresce g-1 h-1; r=0.89 r=0.76 respectively). On other hand, a low richness was found rhizospheric soils all four evaluated plants, finding total five species. Nevertheless, one these corresponds new specie (Corymbiglomus pacificum), arenaria. Our results suggest saline ecosystems, especially enhancing establishment Amb. could promote further nurse effect allow AM be considered as biotechnological tool since they used for stabilization coastal or hydric limitations.