Abstract
Armillaria species show considerable variation in ecological roles and virulence, from mycorrhizae and saprophytes to important root pathogens of trees and horticultural crops. We studied two Armillaria species that can be found in coniferous forests of northwestern USA and southwestern Canada. Armillaria altimontana not only is considered as a weak, opportunistic pathogen of coniferous trees, but it also appears to exhibit in situ biological control against A. solidipes, formerly North American A. ostoyae, which is considered a virulent pathogen of coniferous trees. Here, we describe their genome assemblies and present a functional annotation of the predicted genes and proteins for the two Armillaria species that exhibit contrasting ecological roles. In addition, the soil microbial communities were examined in association with the two Armillaria species within a 45-year-old plantation of western white pine (Pinus monticola) in northern Idaho, USA, where A. altimontana was associated with improved tree growth and survival, while A. solidipes was associated with reduced growth and survival. The results from this study reveal a high similarity between the genomes of the beneficial/non-pathogenic A. altimontana and pathogenic A. solidipes; however, many relatively small differences in gene content were identified that could contribute to differences in ecological lifestyles and interactions with woody hosts and soil microbial communities.
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Data Availability
The datasets generated and/or analyzed during the current study are available in the NCBI database. The corresponding genome assemblies were deposited at the NCBI with accession number JAIWYR000000000 for Armillaria altimontana, and JAIWYQ000000000 for A. solidipes, and microbial dataset is in NCBI SRA database under accession number PRJNA767898.
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Funding
This study was funded in part by the USDA Forest Service, State & Private forestry, Forest Health Protection, Special Technology Development Program and Joint Venture Agreements (19-JV-11221633–093 and 20-JV-11221633–141) to Colorado State University (JES).
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All authors contributed to the study conception and design. Material preparation and data collection were performed by Bradley Lalande, John Hanna, Mee-Sook Kim, Ned Klopfenstein, and Jane Stewart. Analyses were performed by Jorge Ibarra Caballero, Bradley Lalande, and Jane Stewart. The first draft of the manuscript was written by Jorge Ibarra Caballero, Bradley Lalande, and Jane Stewart, and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Supplementary Fig. S1 Comparison of numbers of putativepathogenicity-related secreted proteins in the Armillaria altimontana and A.solidipes (PDF 41 KB)
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Supplementary Fig. S3 Rarefaction curves to assess species richnessand sequencing depth for individual samples meta-barcoded at the 16S (A) andITS (B) for bacterial and fungal communities, respectively (PDF 4925 KB)
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Supplementary Fig. S4 Principal component analyses of themeta-barcode 16S (A) and ITS (B) data for bacterial and fungal communitiesassociated with A. solidipes (red) and A. altimontana (black),respectively (PDF 168 KB)
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Caballero, J.R.I., Lalande, B.M., Hanna, J.W. et al. Genomic Comparisons of Two Armillaria Species with Different Ecological Behaviors and Their Associated Soil Microbial Communities. Microb Ecol 85, 708–729 (2023). https://doi.org/10.1007/s00248-022-01989-8
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DOI: https://doi.org/10.1007/s00248-022-01989-8