Este trabalho teve como objetivo avaliar a ocorrência de associação micorrízica arbuscular em Euterpe edulis (Palmeira Juçara), na região de Rio Pomba/MG. Inicialmente, coletou-se solo da rizosfera de E. edulis em cinco áreas distintas. Em seguida, realizouse a extração de esporos e se estabeleceu o processo de descoloração e coloração das raízes. Constatou-se a presença de estruturas típicas de associação micorrízica arbuscular nas raízes em estudo e presença, em todas as áreas, de esporos de fungos micorrízicos arbusculares (FMAs). Estes resultados abrem a possibilidade para estudos mais abrangentes visando à seleção de estirpes fúngicas eficientes e possíveis formas de inoculação desta palmeira em viveiro.
Coffee crop in Brazil is typically grown as a monoculture. However, we hypothesized that agroforestry system is favorable association for arbuscular mycorrhizal fungi (AMF), affecting its community structure and potentially impacting crop productivity and agroecosystem health. This study evaluated how the microclimate, soil depth, macauba field spacing and distance between coffee plants and palms affect the structure of the AMF community. The structure of the AMF community was influenced by the soil depth, microclimate features, soil moisture, maximum air temperature, and photosynthetically active radiation (PAR). The distance at which coffee-macauba influences ecological diversity indices of AMF, and higher diversity are related to the proximity between plants. AMF diversity (Richness and Shannon) in the agroforestry system exceeded that observed in the full-sun coffee in the 0-20 soil depth layer. Our results showed that the microclimate, soil depth, plant density, and distance between coffee from macauba affected the AMF community structure.
Euterpe edulis Martius is one of the endangered species of the Brazilian Atlantic Forest which presents low germination rate and slow seedling growth. Arbuscular mycorrhizal fungi (AMF) are known by their symbiosis with plants, promoting an increase of water and nutrientes uptake. This study aimed at evaluating the effect of AMF inoculation on the initial growth (6 months) and nutrients uptake in E. edulis seedlings. Treatments consisted of the inoculation of pre-germinated seeds with AMF spores collected from three sites (forest, Juçara and crop), as well as a control with no inoculation. Seedlings growth, number of AMF spores in the substrate and uptake of the N, P, K, Ca and Mg macronutrients in plant tissues were analyzed. Inoculation with AMF improved the initial growth of seedlings, regardless of the source of inoculum used in the experiment, and the inoculation with material collected from rhizosphere increased the shoot and root dry biomass of seedlings by 43 % and 61 %, respectively. Inoculation with AMF provided a greater accumulation of all nutrients assessed in the shoot and root of seedlings, especially when spores were collected at the Juçara site. Inoculation with AMF is a promising strategy to improve the spread of this species.
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