6 results on '"Cyle, K. Taylor"'
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2. Faster redox fluctuations can lead to higher iron reduction rates in humid forest soils
- Author
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Barcellos, Diego, Cyle, K. Taylor, and Thompson, Aaron
- Published
- 2018
3. Dynamic utilization of low‐molecular‐weight organic substrates across a microbial growth rate gradient.
- Author
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Cyle, K. Taylor, Klein, Annaleise R., Aristilde, Ludmilla, and Martínez, Carmen Enid
- Subjects
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MICROBIAL growth , *SOIL microbiology , *OXIDATION states , *SOIL solutions , *PENICILLIUM - Abstract
Aim: Low‐molecular‐weight organic substances (LMWOSs) are at the nexus between micro‐organisms, plant roots, detritus, and the soil mineral matrix. The nominal oxidation state of carbon (NOSC) has been suggested as a potential parameter for modelling microbial uptake rates of LMWOSs and the efficiency of carbon incorporation into new biomass. Methods and Results: In this study, we assessed the role of compound class and oxidation state on uptake kinetics and substrate‐specific carbon use efficiency (SUE) during the growth of three model soil micro‐organisms, a fungal isolate (Penicillium spinulosum) and two bacterial isolates (Paraburkholderia solitsugae, and Ralstonia pickettii). Isolates were chosen that spanned a growth rate gradient (0.046–0.316 h−1) in media containing 34 common LMWOSs at realistically low initial concentrations (25 μM each). Clustered, co‐utilization of LMWOSs occurred for all three organisms. Potential trends (p < 0.05) for early utilization of more oxidized substrates were present for the two bacterial isolates (P. solitsugae and R. pickettii), but high variability (R2 < 0.15) and a small effect of NOSC indicate these relationships are not useful for prediction. The SUEs of selected substrates ranged from 0.16 to 0.99 and there was no observed relationship between NOSC and SUE. Conclusion: Our results do not provide compelling population‐level support for NOSC as a predictive tool for either uptake kinetics or the efficiency of use of LMWOS in soil solution. Significance and Impact of the Study: Metabolic strategies of organisms are likely more important than chemical identity in determining LMWOS cycling in soils. Previous community‐level observations may be biased towards fast‐responding bacterial community members. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
4. Ecophysiological Study of Paraburkholderia sp. Strain 1N under Soil Solution Conditions: Dynamic Substrate Preferences and Characterization of Carbon Use Efficiency.
- Author
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Cyle, K. Taylor, Klein, Annaleise R., Aristilde, Ludmilla, and Martínez, Carmen Enid
- Subjects
- *
SOIL solutions , *CATABOLITE repression , *OXIDATION states , *ORGANIC acids , *MOUNTAIN soils , *CARBON - Abstract
We used time-resolved metabolic footprinting, an important technical approach used to monitor changes in extracellular compound concentrations during microbial growth, to study the order of substrate utilization (i.e., substrate preferences) and kinetics of a fast-growing soil isolate, Paraburkholderia sp. strain 1N. The growth of Paraburkholderia sp. 1N was monitored under aerobic conditions in a soilextracted solubilized organic matter medium, representing a realistic diversity of available substrates and gradient of initial concentrations. We combined multiple analytical approaches to track over 150 compounds in the medium and complemented this with bulk carbon and nitrogen measurements, allowing estimates of carbon use efficiency throughout the growth curve. Targeted methods allowed the quantification of common low-molecular-weight substrates: glucose, 20 amino acids, and 9 organic acids. All targeted compounds were depleted from the medium, and depletion followed a sigmoidal curve where sufficient data were available. Substrates were utilized in at least three distinct temporal clusters as Paraburkholderia sp. 1N produced biomass at a cumulative carbon use efficiency of 0.43. The two substrates with highest initial concentrations, glucose and valine, exhibited longer usage windows, at higher biomass-normalized rates, and later in the growth curve. Contrary to hypotheses based on previous studies, we found no clear relationship between substrate nominal oxidation state of carbon (NOSC) or maximal growth rate and the order of substrate depletion. Under soil solution conditions, the growth of Paraburkholderia sp. 1N induced multiauxic substrate depletion patterns that could not be explained by the traditional paradigm of catabolite repression. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
5. Water deficits shape the microbiome of Bermudagrass roots to be Actinobacteria rich.
- Author
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Hu J, Cyle KT, Miller G, and Shi W
- Subjects
- Bacteria classification, Bacteria drug effects, Bacteria genetics, Rhizosphere, Soil chemistry, Soil Microbiology, Water pharmacology, Biodiversity, Genes, Bacterial genetics, Actinobacteria drug effects, Actinobacteria genetics, Cynodon microbiology, Microbiota drug effects, Microbiota genetics, Plant Roots microbiology, Dehydration
- Abstract
There is increasing evidence that microbes can help ameliorate plant growth under environmental stress. Still, it is largely unknown what microbes and potential functions are involved in sustaining turfgrass, the major component of urban/suburban landscapes, under drought. We examined microbial responses to water deficits in bulk soil, rhizosphere, and root endosphere of bermudagrass by applying evapotranspiration (ET)-based dynamic irrigation twice per week during the growing season to create six treatments (0%, 40%, 60%, 80%, 100%, and 120% ET) and respective drought-stressed soil conditions. Bacterial and fungal communities were analyzed via marker gene amplicon sequencing and thereafter drought-reshaped potential functions of the bacterial community were projected. Slight yet significant microbial responses to irrigation treatments were observed in all three microhabitats. The root endophytic bacterial community was most responsive to water stress. No-irrigation primarily increased the relative abundance of root endophytic Actinobacteria, especially the genus Streptomyces. Irrigation at ≤40% ET increased the relative abundances of PICRUSt2-predicted functional genes encoding 1-aminocyclopropane-1-carboxylic acid deaminase, superoxide dismutase, and chitinase in root endosphere. Our data suggest that the root endophytic Actinobacteria are likely the key players to improve bermudagrass fitness under drought by modulating phytohormone ethylene production, scavenging reactive oxygen species, or ameliorating nutrient acquisition., (© The Author(s) 2023. Published by Oxford University Press on behalf of FEMS.)
- Published
- 2023
- Full Text
- View/download PDF
6. Paraburkholderia solitsugae sp. nov. and Paraburkholderia elongata sp. nov., phenolic acid-degrading bacteria isolated from forest soil and emended description of Paraburkholderia madseniana .
- Author
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Wilhelm RC, Cyle KT, Martinez CE, Karasz DC, Newman JD, and Buckley DH
- Subjects
- Bacterial Typing Techniques, Base Composition, Burkholderiaceae isolation & purification, DNA, Bacterial genetics, Fatty Acids chemistry, Hydroxybenzoates, New York, Nucleic Acid Hybridization, Phospholipids chemistry, RNA, Ribosomal, 16S genetics, Sequence Analysis, DNA, Ubiquinone chemistry, Burkholderiaceae classification, Forests, Phylogeny, Soil Microbiology
- Abstract
Two bacterial strains, 1N
T and 5NT , were isolated from hemlock forest soil using a soluble organic matter enrichment. Cells of 1NT (0.65×1.85 µm) and 5NT (0.6×1.85 µm) are Gram-stain-negative, aerobic, motile, non-sporulating and exist as single rods, diplobacilli or in chains of varying length. During growth in dilute media (≤0.1× tryptic soy broth; TSB), cells are primarily motile with flagella. At higher concentrations (≥0.3× TSB), cells of both strains increasingly form non-motile chains, and cells of 5NT elongate (0.57×~7 µm) and form especially long filaments. Optimum growth of 1NT and 5NT occurred at 25-30 °C, pH 6.5-7.0 and <0.5% salinity. Results of comparative chemotaxonomic, genomic and phylogenetic analyses revealed that 1NT and 5NT were distinct from one another and their closest related type strains: Paraburkholderia madseniana RP11T , Paraburkholderia aspalathi LMG 27731T and Paraburkholderia caffeinilytica CF1T . The genomes of 1NT and 5NT had an average nucleotide identity (91.6 and 91.3%) and in silico DNA-DNA hybridization values (45.8%±2.6 and 45.5%±2.5) and differed in functional gene content from their closest related type strains. The composition of fatty acids and patterns of substrate use, including the catabolism of phenolic acids, also differentiated strains 1NT and 5NT from each other and their closest relatives. The only ubiquinone present in strains 1NT and 5NT was Q-8. The major cellular fatty acids were C16 : 0 , 3OH-C16 : 0 , C17 : 0 cyclo, C19 : 0 cyclo ω8 c and summed features 2 (3OH-C14 : 0 / C16 : 1 iso I), 3 (C16 : 1 ω6 c /ω7 c ) and 8 (C18 : 1 ω7 c /ω6 c ). A third bacterium, strain RL16-012-BIC-B, was isolated from soil associated with shallow roots and was determined to be a strain of P. madseniana (ANI, 98.8%; 16S rRNA gene similarity, 100%). Characterizations of strain RL16-012-BIC-B (DSM 110723=LMG 31706) led to proposed emendments to the species description of P. madseniana . Our polyphasic approach demonstrated that strains 1NT and 5NT represent novel species from the genus Paraburkholderia for which the names Paraburkholderia solitsugae sp. nov. (type strain 1NT =DSM 110721T =LMG 31704T ) and Paraburkholderia elongata sp. nov. (type strain 5NT =DSM 110722T =LMG 31705T ) are proposed.- Published
- 2020
- Full Text
- View/download PDF
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