George Newcombe
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View article: Biotechnology and Genomic Approaches to Mitigating Disease Impacts on Forest Health
Biotechnology and Genomic Approaches to Mitigating Disease Impacts on Forest Health Open
Outbreaks of insects and diseases are part of the natural disturbance regime of all forests. However, introduced pathogens have had outsized impacts on many dominant forest tree species over the past century. Mitigating these impacts and r…
View article: Editorial: Biotechnological applications of endophytes in agriculture, environment and industry
Editorial: Biotechnological applications of endophytes in agriculture, environment and industry Open
One of the main causes of the global drop in crop productivity is pathogenic microorganisms.Endophytes diminish the injury triggered by pathogens through synthesizing antibiosis, the production of lytic enzymes, secondary metabolites, and …
View article: Nematodes Consume Four Species of a Common, Wood-Decay Fungus
Nematodes Consume Four Species of a Common, Wood-Decay Fungus Open
Since nitrogen is in short supply in wood yet relatively plentiful in the bodies of nematodes, wood-decay fungi have been thought to be nematophagous. In an earlier study, we confirmed the nematophagy of two species of wood-decay fungi (Pl…
View article: Editorial: Plant Microbiome: Interactions, Mechanisms of Action, and Applications, Volume II
Editorial: Plant Microbiome: Interactions, Mechanisms of Action, and Applications, Volume II Open
EDITORIAL article Front. Microbiol., 31 May 2022Sec. Microbial Symbioses https://doi.org/10.3389/fmicb.2022.915684
View article: Characterizing the Defense Hierarchy of <em>Populus trichocarpa</em>
Characterizing the Defense Hierarchy of <em>Populus trichocarpa</em> Open
The U.S. Departments of Energy and Agriculture are developing bioenergy crops as a sustainable alternative to traditional fossil fuels. Plant disease threatens this effort by inhibiting the efficient production of plant feedstocks for bioe…
View article: Adult plant resistance to white rust in Lunaria annua
Adult plant resistance to white rust in Lunaria annua Open
Wild plants produce abundant seeds and seedlings, but most die before reaching maturity, and these premature deaths are often caused by pathogens. Major genes for resistance protect some seedlings or juveniles. These selected individuals c…
View article: Editorial: Plant Microbiome: Interactions, Mechanisms of Action, and Applications
Editorial: Plant Microbiome: Interactions, Mechanisms of Action, and Applications Open
EDITORIAL article Front. Microbiol., 05 July 2021Sec. Microbial Symbioses https://doi.org/10.3389/fmicb.2021.706049
View article: Culturable Seed Microbiota of Populus trichocarpa
Culturable Seed Microbiota of Populus trichocarpa Open
Plants harbor a diverse community of microbes, whose interactions with their host and each other can influence plant health and fitness. While microbiota in plant vegetative tissues has been extensively studied, less is known about members…
View article: Foliar endophytes in trees varying greatly in age
Foliar endophytes in trees varying greatly in age Open
Temple trees, including the gymnosperm Platycladus orientalis and the angiosperm Styphnolobium japonicum , have been planted in China for thousands of years. Tree age thus varies widely from young to ancient trees. Foliar endophytes of P. …
View article: Aspergillus tubingensis Is a Pre-Emergent Pathogen of Date Palm Seedlings
Aspergillus tubingensis Is a Pre-Emergent Pathogen of Date Palm Seedlings Open
Many diseases of date palm are known. However, pathogens that might affect seed germination and seedling emergence from soil are poorly studied, perhaps because date palm cultivars are propagated vegetatively. Here, we first determined the…
View article: Peer Review #2 of "Foliar mycoendophytome of an endemic plant of the Mediterranean biome (Myrtus communis) reveals the dominance of basidiomycete woody saprotrophs (v0.2)"
Peer Review #2 of "Foliar mycoendophytome of an endemic plant of the Mediterranean biome (Myrtus communis) reveals the dominance of basidiomycete woody saprotrophs (v0.2)" Open
The true myrtle, Myrtus communis, is a small perennial evergreen tree that occurs in Europe, Africa, and Asia with a circum-Mediterranean geographic distribution.Unfortunately, the Mediterranean Forests, where M. communis occurs, are criti…
View article: Leaf Endophytes of Populus trichocarpa Act as Pathogens of Neighboring Plant Species
Leaf Endophytes of Populus trichocarpa Act as Pathogens of Neighboring Plant Species Open
The conventional definition of endophytes is that they do not cause disease, whereas pathogens do. Complicating this convention, however, is the poorly explored phenomenon that some microbes are endophytes in some plants but pathogens in o…
View article: Isolation, Characterization, and Pathogenicity of Two Pseudomonas syringae Pathovars from Populus trichocarpa Seeds
Isolation, Characterization, and Pathogenicity of Two Pseudomonas syringae Pathovars from Populus trichocarpa Seeds Open
Pseudomonas syringae is a ubiquitous plant pathogen, infecting both woody and herbaceous plants and resulting in devastating agricultural crop losses. Characterized by a remarkable specificity for plant hosts, P. syringae pathovars utilize…
View article: <i>Ventenata dubia</i>’s native range and consideration of plant pathogens for biological control
<i>Ventenata dubia</i>’s native range and consideration of plant pathogens for biological control Open
Ventenata [ Ventenata dubia (Leers) Coss.] is a nonindigenous, invasive grass in the inland Pacific Northwest (PNW) of the United States. It appears to be present in the PNW without any evidence of disease expression. Surveys of V. dubia i…
View article: Leaf Cuticle Can Contribute to Non-Host Resistance to Poplar Leaf Rust
Leaf Cuticle Can Contribute to Non-Host Resistance to Poplar Leaf Rust Open
The plant leaf cuticle is a chemically complex but largely waxy outer shell that limits water loss and also prevents some pathogens from gaining access to internal mesophyll. Rust fungi are obligate parasites, and most bypass the cuticle b…
View article: Effects of Antagonists on Mycotoxins of Seedborne Fusarium spp. in Sweet Corn
Effects of Antagonists on Mycotoxins of Seedborne Fusarium spp. in Sweet Corn Open
Fusarium species coexist as toxigenic, systemic pathogens in sweet corn seed production in southwestern Idaho, USA. We hypothesized that fungal antagonists of seedborne Fusarium would differentially alter production of Fusarium mycotoxins …
View article: Differentiating spatial from environmental effects on foliar fungal communities of <i>Populus trichocarpa</i>
Differentiating spatial from environmental effects on foliar fungal communities of <i>Populus trichocarpa</i> Open
Aim Foliar fungi – pathogens, endophytes, epiphytes – form taxonomically diverse communities that affect plant health and productivity. The composition of foliar fungal communities is variable at spatial scales both small (e.g. individual …
View article: Contingency rules for pathogen competition and antagonism in a genetically based, plant defense hierarchy
Contingency rules for pathogen competition and antagonism in a genetically based, plant defense hierarchy Open
Plant defense against pathogens includes a range of mechanisms, including, but not limited to, genetic resistance, pathogen‐antagonizing endophytes, and pathogen competitors. The relative importance of each mechanism can be expressed in a …
View article: Nematophagous Pleurotus Species Consume Some Nematode Species but Are Themselves Consumed by Others
Nematophagous Pleurotus Species Consume Some Nematode Species but Are Themselves Consumed by Others Open
Pleurotus species are said to be nematophagous because they paralyze and consume some bacterial-feeding nematodes. It has never been clear whether that means all nematodes. Here we tested thirteen bacterial-feeding nematode species: seven …
View article: The First Record of a North American Poplar Leaf Rust Fungus, Melampsora medusae, in China
The First Record of a North American Poplar Leaf Rust Fungus, Melampsora medusae, in China Open
A wide range of species and hybrids of black and balsam poplars or cottonwoods (Populus L., sections Aigeiros and Tacamahaca) grow naturally, or have been introduced to grow in plantations in China. Many species of Melampsora can cause pop…
View article: NEMATODES ASSOCIATED WITH INVASIVE SPOTTED KNAPWEED
NEMATODES ASSOCIATED WITH INVASIVE SPOTTED KNAPWEED Open
Freedom from plant-parasitic nematodes associated with the native ranges of plants might contribute to plant invasions in new areas. However, nematode damage surveys and diversity inventories are largely limited to crop plants. No invasive…
View article: Resistance to an eriophyid mite in an interspecific hybrid pedigree of Populus
Resistance to an eriophyid mite in an interspecific hybrid pedigree of Populus Open
Schizoempodium mesophyllincola is an eriophyid mite that feeds in leaves of Populus trichocarpa in the central part of this cottonwood tree's range (i.e., coastal British Columbia, Washington and Oregon) in the Pacific Northwest (PNW) of N…
View article: A Hypothetical Bottleneck in the Plant Microbiome
A Hypothetical Bottleneck in the Plant Microbiome Open
The plant microbiome may be bottlenecked at the level of endophytes of individual seeds. Strong defense of developing seeds is predicted by optimal defense theory, and we have experimentally demonstrated exclusionary interactions among end…
View article: Peer Review #1 of "Foliar microbiome transplants confer disease resistance in a critically-endangered plant (v0.1)"
Peer Review #1 of "Foliar microbiome transplants confer disease resistance in a critically-endangered plant (v0.1)" Open
There has been very little effort to incorporate foliar microbiomes into plant conservation efforts even though foliar endophytes are critically important to the fitness and function of hosts.Many critically endangered plants that have bee…
View article: <i>Sydowia polyspora</i> is both a Foliar Endophyte and a Preemergent Seed Pathogen in <i>Pinus ponderosa</i>
<i>Sydowia polyspora</i> is both a Foliar Endophyte and a Preemergent Seed Pathogen in <i>Pinus ponderosa</i> Open
Poor seedling performance and reduced seed emergence are often ascribed to known pathogens that cause low seedling recruitment and poor seed emergence in forest nurseries and regeneration plantings. On the other hand, foliar endophytes are…
View article: Data for: Xerotolerance of Penicillium and DSE fungi, the core mycobiome of fine lateral roots of woody plants in the intermountain Pacific Northwest, USA
Data for: Xerotolerance of Penicillium and DSE fungi, the core mycobiome of fine lateral roots of woody plants in the intermountain Pacific Northwest, USA Open
File containing GenBank and Westerdijk Institute accession numbers for Penicillium spp. listed in table 2 of the manuscript Xerotolerance of Penicillium and DSE fungi, the core mycobiome of fine lateral roots of woody plants in the intermo…
View article: Xanthoria parietina in the Inland Pacific Northwest
Xanthoria parietina in the Inland Pacific Northwest Open
The lichen Xanthoria parietina has a widespread distribution in Asia, Africa, Australia, and Northern Europe. Records of this species in the United States have been limited to coastal areas, hence its common name, “the maritime sunburst…