| Despite the awareness that high phosphorus (P) availability decreases the mycorrhizal root colonization in higher plants, the effects on the external mycelium are contradicting. The aim of this work was to assess the external mycelium of the arbuscular mycorrhizal fungi (AMF) Glomus intraradices and Gigaspora rosea, associated to soybean under increasing P levels (0, 25, 50, 100 and 200 mg kg-1). The tested hypotheses were: a) the amount of external mycelium depends on the fungal species; b) the P levels affect diferentially each mycorrhizal species; c) the mycorrhizal effectiveness depends on the amount of external mycelium. Mycorrhizal stimulus on plant biomass occurred at P levels of 0, 25 and 200 mg kg-1. Mycorrhizal root colonization and total... |
