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POSTERS: Mycology II

P-390 - Genomic resources for Armillaria mexicana, a recently described species in North America

Tuesday, August 5, 2025
10:15 AM - 11:00 AM HST
Location: Exhibit Hall 3
Abstract Text:

Armillaria root disease of trees and shrubs is caused by Armillaria spp. that are found globally across in temperate and tropical ecosystems. Recent genomic studies of Armillaria species have discovered genes associated with host specialization, lifestyle, and other enzymatic activities that vary across ecosystems and continents. Armillaria mexicana is a recently discovered destructive pathogen of diverse woody plants in forests and horticultural settings currently known to occur in Mexico. Recent phylogenetic analyses have determined that A. mexicana is basal to the other Northern Hemisphere Armillaria spp. We performed whole genome sequencing and analyses to characterize A. mexicana for comparisons with other North American Armillaria spp. The genome size of A. mexicana was smaller than other Armillaria spp. at 49 Mb compared to 70 Mb, 73, and 55 Mb for A. mellea, A. altimontana, and A. solidipes, respectively. We compared the carbohydrate degrading enzymes, secondary metabolites, and secretomes across these four species. We compared the carbohydrate degrading enzymes, secondary metabolites, and secretomes across these four species, and A. mexicana had a similar number of these genes compared to A. mellea, but larger numbers compared to A. altimontana, and A. solidipes. These comparisons enhance our understanding of the pathogenicity of Armillaria spp. and their host interactions.