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Title: The Evolutionary Innovation of Nutritional Symbioses in Leaf-Cutter Ants

Journal Article · · Insects
 [1];  [1];  [2]
  1. Univ. of Wisconsin, Madison, WI (United States). Dept. of Bacteriology; Univ. of Wisconsin, Madison, WI (United States). Dept. of Energy Great Lakes Bioenergy Research Center
  2. Univ. of Wisconsin, Madison, WI (United States). Dept. of Bacteriology

Fungus-growing ants gain access to nutrients stored in plant biomass through their association with a mutualistic fungus they grow for food. This 50 million-year-old obligate mutualism likely facilitated some of these species becoming dominant Neotropical herbivores that can achieve immense colony sizes. Recent culture-independent investigations have shed light on the conversion of plant biomass into nutrients within ant fungus gardens, revealing that this process involves both the fungal cultivar and a symbiotic community of bacteria including Enterobacter, Klebsiella, and Pantoea species. Moreover, the genome sequences of the leaf-cutter ants Atta cephalotes and Acromyrmex echinatior have provided key insights into how this symbiosis has shaped the evolution of these ants at a genetic level. Here we summarize the findings of recent research on the microbial community dynamics within fungus-growing ant fungus gardens and discuss their implications for this ancient symbiosis.

Research Organization:
Univ. of Wisconsin, Madison, WI (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER). Biological Systems Science Division; National Science Foundation (NSF)
Grant/Contract Number:
FC02-07ER64494; DEB-0747002
OSTI ID:
1629736
Journal Information:
Insects, Vol. 3, Issue 1; ISSN 2075-4450
Publisher:
MDPICopyright Statement
Country of Publication:
United States
Language:
English

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The impact of microbial symbionts on host plant utilization by herbivorous insects journal August 2013
The fungal symbiont of Acromyrmex leaf-cutting ants expresses the full spectrum of genes to degrade cellulose and other plant cell wall polysaccharides journal January 2013
Convergent Bacterial Microbiotas in the Fungal Agricultural Systems of Insects journal October 2014
Complete Genome of Serratia sp. Strain FGI 94, a Strain Associated with Leaf-Cutter Ant Fungus Gardens journal May 2013
Phylogenetic patterns of ant–fungus associations indicate that farming strategies, not only a superior fungal cultivar, explain the ecological success of leafcutter ants journal May 2018
Welcome to the Atta world: A framework for understanding the effects of leaf‐cutter ants on ecosystem functions journal March 2019
Genetic and genomic evidence of niche partitioning and adaptive radiation in mountain pine beetle fungal symbionts journal March 2017
Polydnaviruses of Parasitic Wasps: Domestication of Viruses To Act as Gene Delivery Vectors journal January 2012
Major changes in microbial diversity and community composition across gut sections of a juvenile Panchlora cockroach journal May 2017
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Enrichment and Broad Representation of Plant Biomass-Degrading Enzymes in the Specialized Hyphal Swellings of Leucoagaricus gongylophorus, the Fungal Symbiont of Leaf-Cutter Ants journal August 2015
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