Estabelecimento e capacidade infectiva de Gigaspora margarita Becker & Hall e Glomus clarum Nicol. & Gerd. em solo sob erosão

Abstract

The processes of recovering degraded lands may be benefited by the inoculation of selected arbuscular mycorrhizal fungi (AMF), for effectivety and competitiveness. Two greenhouse experiments were calTied out, with the aim of evaluating the establishment and infective capacity (IC) of introduced fungi in relation to community of autochthonous fungi (AF). In the first study, 10 plant species were cultivated (three grasses and seven legumes) with three inoculum treatments [control; G. margarila (CNPAB 001); G. clarum (CNPAB 005)]. In the second study, the IC of the AMF was evaluated in the soil after the first experiment in bioassays, with trap plants transplanted weekly to pots containing autoclaved soil. The establishment and IC of AMF were based on the presence of spores after harvest. The introduction of AMF and the plant species influenccd the sporulation of AF (Acalospora rugosa, Entrophospora colombiana, Gigaspora margarita and Glomus mac) in a differentiated way. The inoculation made the establishment of the inoculated fungus in ali tested plants possible. However, only G. clarum presented IC to compete with the autochthonous fungi. The IC of these isolates showed no relationship to numbcr of spores. The production of commercial inoculum using these fungi is discussed.