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Your search keyword '"Jahn, Courtney E."' showing total 29 results
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29 results on '"Jahn, Courtney E."'

1. Potato Soil Core Microbiomes Are Regionally Variable Across the Continental United States

Author

Klasek, Scott A., primary, Crants, James E., additional, Abbas, Touqeer, additional, Ashley, Katherine, additional, Bolton, Marian L., additional, Celovsky, Madelyn, additional, Gudmestead, Neil C., additional, Hao, Jianjun, additional, Caballero, Jorge R. Ibarra, additional, Jahn, Courtney E., additional, Nkuekam, Gilbert Kamgan, additional, Lankau, Richard A., additional, Larkin, Robert P., additional, Lopez-Echartea, Eglantina, additional, Miller, Jeff, additional, Moore, Amber, additional, Pasche, Julie S., additional, Ruark, Matthew D., additional, Schroeder, Brenda K., additional, Shan, Shan, additional, Skillman, Victoria P., additional, Srour, Ali, additional, Stasko, Anna K., additional, Steinke, Kurt, additional, Stewart, Jane E., additional, Thornton, Mike, additional, Zitnick-Anderson, Kim, additional, Frost, Kenneth E., additional, Rosen, Carl J., additional, and Kinkel, Linda L., additional

Published
2024
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6. Cell Wall Composition and Bioenergy Potential of Rice Straw Tissues Are Influenced by Environment, Tissue Type, and Genotype

Author

Tanger, Paul, Vega-Sánchez, Miguel E., Fleming, Margaret, Tran, Kim, Singh, Seema, Abrahamson, James B., Jahn, Courtney E., Santoro, Nicholas, Naredo, Elizabeth B., Baraoidan, Marietta, Danku, John M. C., Salt, David E., McNally, Kenneth L., Simmons, Blake A., Ronald, Pamela C., Leung, Hei, Bush, Daniel R., McKay, John K., and Leach, Jan E.

Published
2015
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8. Drought-Induced Root Pressure in Sorghum bicolor

Author

Drobnitch, Sarah Tepler, primary, Comas, Louise H., additional, Flynn, Nora, additional, Ibarra Caballero, Jorge, additional, Barton, Ryan W., additional, Wenz, Joshua, additional, Person, Taylor, additional, Bushey, Julie, additional, Jahn, Courtney E., additional, and Gleason, Sean M., additional

Published
2021
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9. Cultivation of mesophilic soil crenarchaeotes in enrichment cultures from plant roots

Author

Simon, Holly M., Jahn, Courtney E., Bergerud, Luke T., Sliwinski, Marek K., Weimer, Paul J., Willis, David K., and Goodman, Robert M.

Subjects
Plant populations -- Genetic aspects, Biological diversity -- Research, Genetic research, Biological sciences
Abstract

One of the two dominant phylotypes of Crenarchaeota that colonizes the roots of tomato plants grown in soil from a Wisconsin field is selectively enriched in mixed cultures amended with root extract. Results indicate that the diversity of crenarchaeal soil assemblage is influenced by the rhizosphere and that mesophilic soil crenarchaeotes are associated with plant roots that show the growth of nonthermophilic crenarchaeotes in culture.

Published
2005

10. The Erwinia chrysanthemi type III secretion system is required for multicellular behavior

Author

Yap, Mee-Ngan, Yang, Ching-Hong, Barak, Jeri D., Jahn, Courtney E., and Charkowski, Amy O.

Subjects
Pathogenic microorganisms -- Research, Bacteriology -- Research, Biological sciences
Abstract

Enterobacterial animal pathogens exhibit aggregative multicellular behavior, which is manifested as pellicles on the culture surface and biofilms at the surface-liquid-air interface. Pellicle formation behavior requires production of extracellular polysaccharide, cellulose, and protein filaments, known as curli. Protein filaments analogous to curli are formed by many protein secretion systems, including the type III secretion system (TTSS). Here, we demonstrate that Erwinia chrysanthemi, which does not carry curli genes, requires the TTSS for pellicle formation. These data support a model where cellulose and generic protein filaments, which consist of either curli or TTSS-secreted proteins, are required for enterobacterial aggregative multicellular behavior. Using this assay, we found that hrpY, which encodes a two-component system response regulator homolog, is required for activity of hrpS, which encodes a [[sigma].sup.54]-dependent enhancer-binding protein homolog. In turn, hrpS is required for activity of the sigma factor homolog hrpL, which activates genes encoding TTSS structural and secreted proteins. Pellicle formation was temperature dependent and pellicles did not form at 36[degrees]C, even though TTSS genes were expressed at this temperature. We found that cellulose is a component of the E. chrysanthemi pellicle but that pellicle formation still occurs in a strain with an insertion in a cellulose synthase subunit homolog. Since the TTSS, but not the cellulose synthase subunit, is required for E. chrysanthemi pellicle formation, this inexpensive assay can be used as a high throughput screen for TTSS mutants or inhibitors.

Published
2005

16. A Program for Iron Economy during Deficiency Targets Specific Fe Proteins1[OPEN]

Author

Hantzis, Laura J., Kroh, Gretchen E., Jahn, Courtney E., Cantrell, Michael, Peers, Graham, Pilon, Marinus, and Ravet, Karl

Subjects
Chlorophyll, Chloroplasts, Light, Arabidopsis Proteins, Iron, Arabidopsis, Iron Deficiencies, Carbon Dioxide, Carbon, Electron Transport, Plant Leaves, Biochemistry and Metabolism, Gene Expression Regulation, Plant, RNA, Messenger, Photosynthesis
Abstract

Iron (Fe) is an essential element for plants, utilized in nearly every cellular process. Because the adjustment of uptake under Fe limitation cannot satisfy all demands, plants need to acclimate their physiology and biochemistry, especially in their chloroplasts, which have a high demand for Fe. To investigate if a program exists for the utilization of Fe under deficiency, we analyzed how hydroponically grown Arabidopsis (

Published
2017

21. GC-MS Metabolomics to Evaluate the Composition of Plant Cuticular Waxes for Four Triticum aestivum Cultivars.

Author

Lavergne, Florent D., Broeckling, Corey D., Cockrell, Darren M., Haley, Scott D., Peairs, Frank B., Jahn, Courtney E., and Heuberger, Adam L.

Subjects
WHEAT farming, ABIOTIC stress, WHEAT yields, GAS chromatography/Mass spectrometry (GC-MS), WHEAT genetics
Abstract

Wheat (Triticum aestivum L.) is an important food crop, and biotic and abiotic stresses significantly impact grain yield. Wheat leaf and stem surface waxes are associated with traits of biological importance, including stress resistance. Past studies have characterized the composition of wheat cuticular waxes, however protocols can be relatively low-throughput and narrow in the range of metabolites detected. Here, gas chromatography-mass spectrometry (GC-MS) metabolomics methods were utilized to provide a comprehensive characterization of the chemical composition of cuticular waxes in wheat leaves and stems. Further, waxes from four wheat cultivars were assayed to evaluate the potential for GC-MS metabolomics to describe wax composition attributed to differences in wheat genotype. A total of 263 putative compounds were detected and included 58 wax compounds that can be classified (e.g., alkanes and fatty acids). Many of the detected wax metabolites have known associations to important biological functions. Principal component analysis and ANOVA were used to evaluate metabolite distribution, which was attributed to both tissue type (leaf, stem) and cultivar differences. Leaves contained more primary alcohols than stems such as 6-methylheptacosan-1-ol and octacosan-1-ol. The metabolite data were validated using scanning electron microscopy of epicuticular wax crystals which detected wax tubules and platelets. Conan was the only cultivar to display alcohol-associated platelet-shaped crystals on its abaxial leaf surface. Taken together, application of GC-MS metabolomics enabled the characterization of cuticular wax content in wheat tissues and provided relative quantitative comparisons among sample types, thus contributing to the understanding of wax composition associated with important phenotypic traits in a major crop. [ABSTRACT FROM AUTHOR]

Published
2018
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