How Do Leaf-Cutting Ants Recognize Antagonistic Microbes in Their Fungal Crops?

Author(s)

Goes, Aryel C. ^[1] ; Barcoto, Mariana O. ^[1] ; Kooij, Pepijn W. ^{[1, 2]} ; Bueno, Odair C. ^[1] ; Rodrigues, Andre ^[1]

Affiliation

^[1] Sao Paulo State Univ UNESP, Ctr Study Social Insects, Campus Rio Claro, Rio Claro - Brazil

^[2] Royal Bot Gardens, Comparat Plant & Fungal Biol, London - England

• Document type: Review article
• Source: FRONTIERS IN ECOLOGY AND EVOLUTION; v. 8, MAY 5 2020.
• Web of Science Citations: 0

Abstract

Leaf-cutting ants employ diverse behavioral strategies for promoting the growth of fungal cultivars in a structure known as fungus garden. As a nutritionally rich resource for the ants, the fungal crop is threatened by microbial antagonists and pathogens. Strategies for protecting the garden against harmful microbes have been described in detail, although the process of microbial threat recognition is not fully understood. Here, we review the literature on leaf-cutting ants' social immunity traits, in search of possibilities by which workers recognize harmful microbes in their system. Based on current data, we suggest mechanisms regarding (1) chemical recognition, where discrimination could be related to chemical cues from the antagonistic microbe or semiochemicals released by the fungus garden during harmful interactions, or (2) through associative learning when workers would connect the microbe cues with a damage in the fungus garden, developing a ``colony-level memory{''} toward this threat. We also discuss evidence supporting ant-fungus communication as key for maintaining the health of the fungus garden, as well as experimental setups for future evaluation of threat detection and recognition by leaf-cutting ants. (AU)

• FAPESP's process: 12/25299-6 - Integrated studies for leaf cutting control
• Grantee: João Batista Fernandes
• Support Opportunities: Research Projects - Thematic Grants
• FAPESP's process: 19/03087-6 - In search for specificity and learning in the defensive recognition against fungal antagonists in Atta Sexdens colonies
• Grantee: Aryel Camero Goes
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• FAPESP's process: 19/03746-0 - Collaborative research: Dimensions US-São Paulo: integrating phylogeny, genetics, and chemical ecology to unravel the tangled bank of the multipartite fungus-farming ant symbiosis
• Grantee: André Rodrigues
• Support Opportunities: BIOTA-FAPESP Program - Thematic Grants