Publications

Aug, 2026

Journal

Transcriptomic and functional analyses uncover a conserved effector driving genotype-dependent virulence in the Sphaerulina musiva-Populus trichocarpa interaction

The introduction of invasive microbes compromises the structure, biodiversity, and function of naïve ecosystems. Sphaerulina musiva, a hemibiotrophic pathogen that causes leaf spot and stem cankers in Populus species, exemplifies an invasive fungal pathogen spread by human activities. However, the genetic mechanisms of pathogenicity and virulence are poorly understood, imp…

Apr, 2026

Journal

Microbial Diversity Limits Belowground Colonization of Sphaerulina musiva

Sphaerulina musiva is a fungal pathogen responsible for defoliating leaf spots and fatal stem cankers on Populus trichocarpa and hybrid Populus trees. Although its impact on tree health is well-documented, the influence of the plant-associated microbiome on S. musiva colonization remains unknown. Despite most of the disease cycle occurring aboveground, previous surveys of…

Feb, 2026

Journal

Genomic approaches to accelerate American chestnut restoration

More than a century after two introduced pathogens killed billions of American chestnut trees, introgression of resistance alleles from Chinese chestnuts has contributed to the recovery of self-sustaining populations. However, progress has been slow because of the complex genetic architecture of resistance. To better understand blight resistance, we compared reference geno…

Dec, 2025

Journal

Building an expanded bio-based economy through synthetic biology

The field of synthetic biology is essential to the continued development of a bio-based economy, creating mechanisms to supply carbon needed in the economy by both converting existing end-of-life wastes as well as by creating novel, purpose-grown and sustainable feedstocks. Here, we first discuss the near- and long-term resources available for use as feedstocks for bioconv…

Jun, 2025

Journal

Utilizing Plant Synthetic Biology to Accelerate Plant-Microbe Interactions Research

May, 2025

Journal

Application of Atmospheric Gases and Particulate Matter to the Assessment of Urban Heat Island

Urban heat island (UHI), where built areas are warmer compared to non-urban regions, increases human related diseases and mortality. A key challenge in UHI analysis is the designation of sites as urban or suburban/rural; however, the growing complexity of green spaces in urban areas and the predominance of the transportation sector in nonurban areas creates a dilemma for d…

Jun, 2024

Journal

Complete genome of Pseudomonas putida strain WBB028 isolated from leaf litter

We report the complete genome of Pseudomonas putida strain WBB028, which exhibits broad-spectrum antifungal activity. This strain was isolated from leaf litter collected at Walker Branch Watershed located on the Oak Ridge Reservation in eastern Tennessee (35.9614 N 84.2864 W). The genome is 6.3 Mbp with a 62.5% GC content.

Dec, 2023

Journal

Reflection on the challenges, accomplishments, and new frontiers of gene drives

Ongoing pest and disease outbreaks pose a serious threat to human, crop, and animal life, and emphasize the need for constant genetic discoveries that could serve as mitigation strategies. Gene drives are genetic engineering approaches discovered decades ago that allow a quick, Super-Mendelian dissemination of genetic modifications in wild populations, offering hopes for m…

Dec, 2023

Journal

LaeA-Regulated Fungal Traits Mediate Bacterial Community Assembly

Potent antimicrobial metabolites are produced by filamentous fungi in pure culture, but their ecological functions in nature are often unknown. Using an antibacterial Penicillium isolate and a cheese rind microbial community, we demonstrate that a fungal specialized metabolite can regulate the diversity of bacterial communities. Inactivation of the global regulator, LaeA,…

Nov, 2023

Journal

Lipo-chitooligosaccharides as regulatory signals of fungal growth and development

Lipo-chitooligosaccharides (LCOs) are signaling molecules produced by rhizobial bacteria that trigger the nodulation process in legumes, and by some fungi that also establish symbiotic relationships with plants, notably the arbuscular and ecto mycorrhizal fungi. Here, we show that many other fungi also produce LCOs. We tested 59 species representing most fungal phyla, and…

Nov, 2023

Journal

Lipo-Chitooligosaccharides Induce Specialized Fungal Metabolite Profiles That Modulate Bacterial Growth

Lipo-chitooligosaccharides (LCOs) are historically known for their role as microbial-derived signaling molecules that shape plant symbiosis with beneficial rhizobia or mycorrhizal fungi. Recent studies showing that LCOs are widespread across the fungal kingdom have raised questions about the ecological function of these compounds in organisms that do not form symbiotic rel…

Nov, 2023

Book Chapter

Identifying Fungal Secondary Metabolites and Their Role in Plant Pathogenesis

Pathogenic fungi are the main infectious agents of plants. Secondary metabolites produced by these fungi, also recognized as natural products, are key mediators of plant-fungal interactions. Knowledge on the biosynthesis of these metabolites, the accessibility to fungal genome sequences, and the development of gene disruption techniques open up opportunities to identify ma…