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An experiment was carried out under greenhouse conditions to observe the distribution of arbuscular mycorrhizal (AM) hyphae in the rhizosphere of papaya and other plants under intercropping system. Special acrylic root boxes with three compartments, separated by nylon mesh screens, were constructed. One outer compartment contained seedlings of papaya (Carica papaya L.) and other contained seedlings of bahiagrass (Paspalum notatum Flügge) or millet (Pennisetum glaucum L. R. Br.). The central compartment was inoculated with an AM fungus (Gigaspora margarita). In another experiment, the outer compartments were treated with 25% MeOH eluates of bahiagrass (BRE) and millet (MRE) root extracts. A control box, containning only papaya seedlings was also prepared. Hyphal density, root infection levels and spore numbers were higher in the bahiagrass and millet compartments than in the papaya compartment. Similar results were found for the percentage of AM infection and the number of AM spores. In the compartments treated with BRE and MRE the density of AM hyphae was around 20%, and a few spores were found in those compartments. Few AM hyphae and spores were observed in the control compartment. Um experimento foi conduzido em casa-de-vegetação para observar a distribuição de hifas de fungos micorrízicos arbusculares (FMA), na rizosfera do mamoeiro intercalado com outras plantas. Para isto foram construídos vasos de acrílico divididos em três compartimentos. Mudas de mamoeiro (Carica papaya L.) foram transplantadas para um dos compartimentos laterais em todos os vasos, enquanto que mudas de grama batatais (Paspalum notatum Flügge) e milheto (Pennisetum glaucum L. R. Br.) foram separadamente transplantadas para o outro compartimento situado na outra extremidade. Um outro tratamento foi constituído de mudas de mamoeiro em um compartimento e 25% de extrato metanólico de raízes de grama batatais (BRE) ou de milheto (MRE), fracionados em cromatógrafo de coluna. Um vaso com apenas mudas de mamoeiro foi preparado como testemunha. O compartimento central foi inoculado com o fungo Gigaspora margarita. A densidade de hifas, a percentagem de infecção micorrízica e o número de esporos nos compartimentos com grama batatais e milheto foram maiores do que naqueles com mamoeiro. Nos compartimentos com BRE e MRE e algumas hifas e esporos foram observados nestes compartimentos. Naqueles sem planta, foram observadas poucas hifas ou esporos

Evaluation of the mycelial network formed by arbuscular mycorrhizal hyphae in the rhizosphere of papaya and other plants under intercropping system