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Pathogenicity of Escovopsis weberi: The Parasite of the Attine Ant-Microbe Symbiosis Directly Consumes the Ant-Cultivated Fungus

Hannah T. Reynolds and Cameron R. Currie
Mycologia
Vol. 96, No. 5 (Sep. - Oct., 2004), pp. 955-959
DOI: 10.2307/3762079
Stable URL: http://www.jstor.org/stable/3762079
Page Count: 5
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Pathogenicity of Escovopsis weberi: The Parasite of the Attine Ant-Microbe Symbiosis Directly Consumes the Ant-Cultivated Fungus
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Abstract

Fungi in the genus Escovopsis are known only from the fungus gardens of attine ants. Previous work has established that these anamorphic fungi, allied with the Hypocreales, are specialized and potentially virulent parasites of the ancient mutualism between attine ants and their fungal cultivars. It is unclear whether the primary nutrient source for the pathogen is the mutualist fungal cultivar or the vegetative substrate placed on the gardens by the ants. Here, we determine whether Escovopsis weberi is a parasite of the fungal cultivar, a competitor for the leaf substrate, or both. Bioassays reveal that E. weberi exhibits rapid growth on pure cultivar and negligible growth on sterilized leaf fragments. Light microscopy examination of hyphal-hyphal interactions between E. weberi and the ant fungal cultivar indicate that E. weberi, unlike invasive necrotrophs that always penetrate host hyphae, can secrete compounds that break down host mycelium before contact occurs. Thus, E. weberi is a necrotrophic parasite of the fungal cultivar of attine ants.

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