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Genomic and transcriptomic insights into Raffaelea lauricola pathogenesis
Yucheng Zhang1, Junli Zhang1,2, Dan Vanderpool3,4
1Department of Plant Pathology, University of Florida, 1453 Fifield Hall, Gainesville, FL, 32611-0680, USA.
BMC Genomics
|August 22, 2020
Summary
Laurel wilt fungus Raffaelea lauricola has unique genes for virulence and secondary metabolites, unlike its non-pathogenic relative. These adaptations may explain its lethal impact on North American trees.
Area of Science:
- Plant Pathology
- Mycology
- Genomics
Background:
- Laurel wilt, caused by Raffaelea lauricola, is a lethal vascular disease affecting North American Lauraceae.
- R. lauricola and its vector originated in Asia, where it doesn't cause widespread tree mortality.
- The study investigates genetic differences between pathogenic R. lauricola and non-pathogenic R. aguacate.
Purpose of the Study:
- To identify genetic factors contributing to the pathogenicity of Raffaelea lauricola in North America.
- To compare the genomes of R. lauricola and R. aguacate to understand virulence mechanisms.
Main Methods:
- Generated and compared high-quality draft genome assemblies of R. lauricola and R. aguacate.
- Analyzed unique genes, secreted proteins (including CAZymes), and secondary metabolite clusters in R. lauricola.
- Performed transcriptomic comparisons of infected trees and fungal cultures.
Main Results:
- R. lauricola possesses unique genes for virulence and is enriched in secondary metabolite clusters (PKS, NRPS).
- Significant differences were observed in secreted proteins, including CAZymes involved in polysaccharide binding.
- Genes for secreted proteins, secondary metabolites, and sulfur assimilation pathways were upregulated during infection.
Conclusions:
- Comparative genomics identified potential adaptations in R. lauricola for host colonization and disease development.
- Further functional analysis is needed to understand the interaction of these adaptations with co-evolved Asian hosts versus non-co-evolved North American hosts.
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