Abstract
Abstract Free living amoebae and Fusarium oxysporum can be recovered in the same environment and may potentially interact. The presence of these protozoa could lead to an increased development of this filamentous fungus. To assess this potential risk, the interactions between two free living amoebae, Acanthamoeba castellanii and Hartmanella vermiformis , and F. oxysporum , which can be isolated from soil and water, were studied. After 48 hr of coincubation in tap water, culturable fungi were quantified. In addition, the interactions between the free living amoebae and the fungus were investigated using electron microscopy. We show that the presence of amoeba trophozoites increased the growth of F. oxysporum without fungal influence on amoebae viability. In the same way, incubation of the fungus with culture supernatants of the two amoebae induced fungal germination and increased fungal growth. The results of this study confirm that the presence of amoebae should be taken into consideration in the different environments where they may be in contact with Fusarium .
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