Susan E. Meyer
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View article: Screening of Secondary Metabolites Produced by Nigrospora sphaerica Associated with the Invasive Weed Cenchrus ciliaris Reveals Two New Structurally Related Compounds
Screening of Secondary Metabolites Produced by Nigrospora sphaerica Associated with the Invasive Weed Cenchrus ciliaris Reveals Two New Structurally Related Compounds Open
In the search for new alternative biocontrol strategies, phytopathogenic fungi could represent a new frontier for weed management. In this respect, as part of our ongoing work aiming at using fungal pathogens as an alternative to common he…
View article: Insights into the Ecotoxicology of Radicinin and (10S,11S)-(—)-epi-Pyriculol, Fungal Metabolites with Potential Application for Buffelgrass (Cenchrus ciliaris) Biocontrol
Insights into the Ecotoxicology of Radicinin and (10S,11S)-(—)-epi-Pyriculol, Fungal Metabolites with Potential Application for Buffelgrass (Cenchrus ciliaris) Biocontrol Open
Buffelgrass (Cenchrus ciliaris L.) is an invasive C4 perennial grass species that substantially reduces native plant diversity of the Sonoran Desert through fire promotion and resource competition. Broad-spectrum herbicides are essentially…
View article: Factors Regulating Population Stand Structure in Blackbrush (Coleogyne ramosissima: Rosaceae), a Masting North American Desert Shrub
Factors Regulating Population Stand Structure in Blackbrush (Coleogyne ramosissima: Rosaceae), a Masting North American Desert Shrub Open
Blackbrush (Coleogyne ramosissima Torr.) is the dominant shrub on three million hectares across the transition zone between the western North American warm and cold deserts. This paper presents a study of blackbrush population structure at…
View article: Production of (10S,11S)-(—)-epi-Pyriculol and Its HPLC Quantification in Liquid Cultures of Pyricularia grisea, a Potential Mycoherbicide for the Control of Buffelgrass (Cenchrus ciliaris)
Production of (10S,11S)-(—)-epi-Pyriculol and Its HPLC Quantification in Liquid Cultures of Pyricularia grisea, a Potential Mycoherbicide for the Control of Buffelgrass (Cenchrus ciliaris) Open
(10S,11S)-(—)-epi-pyriculol is a phytotoxic metabolite produced by Pyricularia grisea, a fungus identified as a foliar pathogen on the invasive weed species buffelgrass (Cenchrus ciliaris) in North America. The effective control of buffelg…
View article: Characterizing safe sites for seedling establishment of endangered Arctomecon humilis Coville in a warm desert gypsum environment
Characterizing safe sites for seedling establishment of endangered Arctomecon humilis Coville in a warm desert gypsum environment Open
Plant species endemic to gypsum occur in arid and semiarid regions worldwide and are an important component of biodiversity conservation, but gypsophile habitat selection within more arid gypsum environments remains largely unexplored. Our…
View article: Long‐term seed bank persistence in a stochastic desert environment
Long‐term seed bank persistence in a stochastic desert environment Open
Seed banks, the collection of viable seeds in the soil, are particularly important determinants of population survival in highly variable environments. Predictions of increased stochasticity in the amount and timing of precipitation in des…
View article: Bioactive Metabolite Production in the Genus Pyrenophora (Pleosporaceae, Pleosporales)
Bioactive Metabolite Production in the Genus Pyrenophora (Pleosporaceae, Pleosporales) Open
The genus Pyrenophora includes two important cereal crop foliar pathogens and a large number of less well-known species, many of which are also grass pathogens. Only a few of these have been examined in terms of secondary metabolite produc…
View article: Reproductive Success of an Endangered Plant after Invasive Bees Supplant Native Pollinator Services
Reproductive Success of an Endangered Plant after Invasive Bees Supplant Native Pollinator Services Open
Arctomecon humilis (dwarf bear poppy) is an endangered gypsophile restricted to the St. George area in southern Utah, USA. Extirpation of the rare oligolectic bee Perdita meconis and decline of other native pollinators within the last 20 y…
View article: Life‐history strategy and extinction risk in the warm desert perennial spring ephemeral <i>Astragalus holmgreniorum</i> (Fabaceae)
Life‐history strategy and extinction risk in the warm desert perennial spring ephemeral <i>Astragalus holmgreniorum</i> (Fabaceae) Open
This study of Astragalus holmgreniorum examines its adaptations to the warm desert environment and whether these adaptations will enable it to persist. Its spring ephemeral hemicryptophyte life‐history strategy is unusual in warm deserts. …
View article: Drones, Deep Learning, and Endangered Plants: A Method for Population-Level Census Using Image Analysis
Drones, Deep Learning, and Endangered Plants: A Method for Population-Level Census Using Image Analysis Open
A census of endangered plant populations is critical to determining their size, spatial distribution, and geographical extent. Traditional, on-the-ground methods for collecting census data are labor-intensive, time-consuming, and expensive…
View article: Using drone imagery analysis in rare plant demographic studies
Using drone imagery analysis in rare plant demographic studies Open
For plant species of conservation concern, knowledge of changes in abundance through time is a minimum requirement for informed management. This information is usually acquired through on-the-ground monitoring, which entails counting indiv…
View article: A culture‐independent approach to understanding the role of soil fungal communities in <i>Bromus tectorum</i> stand failure
A culture‐independent approach to understanding the role of soil fungal communities in <i>Bromus tectorum</i> stand failure Open
Cheatgrass ( Bromus tectorum L.) is an invasive annual grass (Poaceae) that has colonized large portions of the Intermountain West. Cheatgrass stand failures have been observed throughout the invaded region, the cause of which may be relat…
View article: Invasive Species Response to Natural and Anthropogenic Disturbance
Invasive Species Response to Natural and Anthropogenic Disturbance Open
Much of the literature dealing with the biology and management of invasive species has focused on the damaging ecological and economic consequences of invasions (see Chaps. 2 , 3 , and 14 of this volume for review). In this chapter, we shi…
View article: A Culture-independent Approach to Understanding the Role of Soil Fungal Communities in Bromus tectorum Stand Failure
A Culture-independent Approach to Understanding the Role of Soil Fungal Communities in Bromus tectorum Stand Failure Open
Bromus tectorum (cheatgrass) is an invasive annual grass that has colonized large portions of the Intermountain Western United States. Cheatgrass stand failures have been observed throughout the invaded region, the cause of which may be re…
View article: Annotated checklist of the vascular plants of Washington County, Utah
Annotated checklist of the vascular plants of Washington County, Utah Open
This thesis is comprised of two parts, the annotated checklist of plants and the explanatory text which precedes it. The checklist includes entries for the 1,207 vascular plant species known to occur in Washington county. each entry consis…
View article: Phytotoxic Activity and Structure–Activity Relationships of Radicinin Derivatives against the Invasive Weed Buffelgrass (Cenchrus ciliaris)
Phytotoxic Activity and Structure–Activity Relationships of Radicinin Derivatives against the Invasive Weed Buffelgrass (Cenchrus ciliaris) Open
Radicinin (1), is a fungal dihydropyranopyran-4,5-dione isolated together with some analogues, namely 3-epi-radicinin, radicinol, 3-epi-radicinol, and cochliotoxin (2–5), from the culture filtrates of the fungus Cochliobolus australiensis,…
View article: The fungal sesquiterpenoid pyrenophoric acid B uses the plant ABA biosynthetic pathway to inhibit seed germination
The fungal sesquiterpenoid pyrenophoric acid B uses the plant ABA biosynthetic pathway to inhibit seed germination Open
Pyrenophoric acid (P-Acid), P-Acid B, and P-Acid C are three phytotoxic sesquiterpenoids produced by the ascomycete seed pathogen Pyrenophora semeniperda, a fungus proposed as a mycoherbicide for biocontrol of cheatgrass, an extremely inva…
View article: The fungal sesquiterpenoid pyrenophoric acid B uses the plant ABA biosynthetic pathway to inhibit seed germination
The fungal sesquiterpenoid pyrenophoric acid B uses the plant ABA biosynthetic pathway to inhibit seed germination Open
Highlight The fungus Pyrenophora semeniperda produces pyrenophoric acid B, a small molecule that exploits the plant ABA biosynthetic pathway to reduce seed germination, increasing its reproductive success. Abstract Pyrenophoric acid (P-Aci…
View article: Application of UAV-Based Methodology for Census of an Endangered Plant Species in a Fragile Habitat
Application of UAV-Based Methodology for Census of an Endangered Plant Species in a Fragile Habitat Open
Accurate census is essential for endangered plant management, yet lack of resources may make complete on-the-ground census difficult to achieve. Accessibility, especially for species in fragile habitats, is an added constraint. We examined…
View article: Radicinin, a Fungal Phytotoxin as a Target-Specific Bioherbicide for Invasive Buffelgrass (Cenchrus ciliaris) Control
Radicinin, a Fungal Phytotoxin as a Target-Specific Bioherbicide for Invasive Buffelgrass (Cenchrus ciliaris) Control Open
The fungal pathogens Cochliobolus australiensis and Pyricularia grisea have recently been isolated from diseased leaves of buffelgrass (Cenchrus ciliaris) in its North American range, and their ability to produce phytotoxic metabolites tha…
View article: Mating system complexity and cryptic speciation in the seed bank pathogen <i>Pyrenophora semeniperda</i>
Mating system complexity and cryptic speciation in the seed bank pathogen <i>Pyrenophora semeniperda</i> Open
Mating strategies contributing to a balance between inbreeding and outcrossing are understudied in all but a few model fungal pathogens. This study examined factors that influence the occurrence of the sexual state of Pyrenophora semeniper…
View article: Phytotoxic Activity of Metabolites Isolated from Rutstroemia sp.n., the Causal Agent of Bleach Blonde Syndrome on Cheatgrass (Bromus tectorum)
Phytotoxic Activity of Metabolites Isolated from Rutstroemia sp.n., the Causal Agent of Bleach Blonde Syndrome on Cheatgrass (Bromus tectorum) Open
A fungal pathogen soon to be described as Rutstroemia capillus-albis (Rutstroemiaceae, Helotiales, Leotiomycetes) has been identified as the causal agent of ‘bleach blonde syndrome’ on the invasive annual grass weed Bromus tectorum (cheatg…
View article: Pyriculins A and B, two monosubstituted hex‐4‐ene‐2,3‐diols and other phytotoxic metabolites produced by <i>Pyricularia grisea</i> isolated from buffelgrass (<scp><i>Cenchrus ciliaris</i></scp>)
Pyriculins A and B, two monosubstituted hex‐4‐ene‐2,3‐diols and other phytotoxic metabolites produced by <i>Pyricularia grisea</i> isolated from buffelgrass (<span><i>Cenchrus ciliaris</i></span>) Open
Pyricularia grisea has been identified as a foliar pathogen on buffelgrass ( Cenchrus ciliaris ) in North America and was studied as a potential source of phytotoxins for buffelgrass control. Two monosubstituted hex‐4‐ene‐2,3‐diols, named …
View article: Population genetic structure of <i>Bromus tectorum</i> in the mountains of western North America
Population genetic structure of <i>Bromus tectorum</i> in the mountains of western North America Open
PREMISE OF THE STUDY: Invasive species are often initially restricted to a narrow range and may then expand through any of multiple mechanisms including phenotypic plasticity, in situ evolution, or selection on traits preadapted for new ha…
View article: 5 Easy Steps to Jump off Your Plateau!
5 Easy Steps to Jump off Your Plateau! Open
water is when it comes to losing weight.Not only does it help to suppress appetite so you are less likely to overeat, but additionally, when you're dehydrated, your kidneys can't function properly, so the body turns to the liver for additi…
View article: Secondary dormancy induction and release in<i>Bromus tectorum</i>seeds: the role of temperature, water potential and hydrothermal time
Secondary dormancy induction and release in<i>Bromus tectorum</i>seeds: the role of temperature, water potential and hydrothermal time Open
Seeds of the winter annual Bromus tectorum lose primary dormancy in summer and are poised to germinate rapidly in the autumn. If rainfall is inadequate, seeds remain ungerminated and may enter secondary dormancy under winter conditions. We…
View article: Development of single‐nucleotide polymorphism markers for <i>Bromus tectorum</i> (Poaceae) from a partially sequenced transcriptome
Development of single‐nucleotide polymorphism markers for <i>Bromus tectorum</i> (Poaceae) from a partially sequenced transcriptome Open
Premise of the study: Bromus tectorum (Poaceae) is an annual grass species that is invasive in many areas of the world but most especially in the U.S. Intermountain West. Single‐nucleotide polymorphism (SNP) markers were developed for use …
View article: Lack of Host Specialization on Winter Annual Grasses in the Fungal Seed Bank Pathogen Pyrenophora semeniperda
Lack of Host Specialization on Winter Annual Grasses in the Fungal Seed Bank Pathogen Pyrenophora semeniperda Open
Generalist plant pathogens may have wide host ranges, but many exhibit varying degrees of host specialization, with multiple pathogen races that have narrower host ranges. These races are often genetically distinct, with each race causing …
View article: A mast‐seeding desert shrub regulates population dynamics and behavior of its heteromyid dispersers
A mast‐seeding desert shrub regulates population dynamics and behavior of its heteromyid dispersers Open
Granivorous rodent populations in deserts are primarily regulated through precipitation‐driven resource pulses rather than pulses associated with mast‐seeding, a pattern more common in mesic habitats. We studied heteromyid responses to mas…
View article: Appendix B. Climate variables with significant correlation to blackbrush plant responses.
Appendix B. Climate variables with significant correlation to blackbrush plant responses. Open
Climate variables with significant correlation to blackbrush plant responses.