Fungal endophyte effects on leaf chemistry alter the in vitro growth rates of leaf-cutting ants' fungal mutualist, Leucocoprinus gongylophorus

Fungal symbionts that colonize leaf tissue asymptomatically (endophytes) can alter the foraging behaviour of leaf-cutting ants, and decrease the productivity of this herbivore's mutualistic fungal cultivar, Leucocoprinus gongylophorus. This negative effect of endophytes on the ant's cultiv...

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Bibliographic Details
Published in:Fungal ecology 2014-04, Vol.8, p.37-45
Main Authors: Estrada, Catalina, Rojas, Enith I., Wcislo, William T., Van Bael, Sunshine A.
Format: Article
Language:English
Subjects:
Atta colombica
Cochliobolus
Colletotrichum tropicale
Endophytic fungi
Formicidae
Leaf-cutting ants
Leucocoprinus gongylophorus
Merremia umbellata
Symbiosis
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Summary:Fungal symbionts that colonize leaf tissue asymptomatically (endophytes) can alter the foraging behaviour of leaf-cutting ants, and decrease the productivity of this herbivore's mutualistic fungal cultivar, Leucocoprinus gongylophorus. This negative effect of endophytes on the ant's cultivar could be the result of direct fungal–fungal interaction or indirect reductions in the quality of leaves, the cultivar's growth substratum. To test for the indirect effects, we measured in vitro growth rates of cultivars in media that contained sterilized leaf extracts from plants with high (Ehigh) and low (Elow) endophyte colonization. We found that, opposite to our expectations, cultivars grew significantly faster in Ehigh leaf extracts compared to Elow extracts. Our results suggest that endophyte-driven changes in leaf chemistry are a less likely explanation for the observed in vivo reduction in the ant's symbiotic fungal growth and imply that the effect of direct endophyte–cultivar interactions inside nests are potentially more important. •We measured the indirect effect of fungal endophytes on leaf-cutting ants' symbiotic fungi in vitro growth.•Growth media contained sterilized leaf extracts from plants with high and low endophyte colonization.•Leucocoprinus gongylophorus fastest growth rates were in extracts from high endophyte leaves.•Growth rates of two additional leaf symbiotic fungi were not affected by culture media.•Endophyte-driven changes in leaf extracts may not explain ants preference for endophyte-free leaves.
ISSN:1754-5048
DOI:10.1016/j.funeco.2013.12.009