Alex Greenlon
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View article: Drought reduces formation, but enhances persistence, of mineral-associated organic matter in a grassland soil
Drought reduces formation, but enhances persistence, of mineral-associated organic matter in a grassland soil Open
Drought effects are pervasive in many terrestrial ecosystems, yet little is known about the impact of drought on the transformation of plant C inputs to mineral-associated organic matter (MAOM) – the largest and slowest-cycling pool of org…
View article: Specialist–Generalist Trade-Offs in Microbial Growth Rates Across Soil Habitats
Specialist–Generalist Trade-Offs in Microbial Growth Rates Across Soil Habitats Open
Microbial ecological strategies are shaped by a fundamental trade-off: is it better to specialize and thrive in a narrow niche or generalize and persist across diverse environments? In soils, this trade-off is particularly relevant in the …
View article: Viruses of Nitrogen-Fixing <i>Mesorhizobium</i> Bacteria in Globally Distributed Chickpea Root Nodules
Viruses of Nitrogen-Fixing <i>Mesorhizobium</i> Bacteria in Globally Distributed Chickpea Root Nodules Open
Legume nodules are specialized environments on plant roots that are induced and dominated by nitrogen-fixing bacteria. Bacteriophages (phages) in these nodules could potentially provide top-down controls on the population size and, therefo…
View article: Ecological Competence, Plant Growth Promoting and Symbiotic Characteristics of Different Mesorhizobium Strains Nodulating Chickpea (Cicer arietinum L.) from Ethiopia
Ecological Competence, Plant Growth Promoting and Symbiotic Characteristics of Different Mesorhizobium Strains Nodulating Chickpea (Cicer arietinum L.) from Ethiopia Open
Chickpea provide multiple benefits, due to high nutritive value as well as the ability of the crop to enrich nitrogen poor soils. In spite of its yield potential this legume depends on the rhizobial association. The objective of this study…
View article: Viruses of nitrogen-fixing Mesorhizobium bacteria in globally distributed chickpea root nodules
Viruses of nitrogen-fixing Mesorhizobium bacteria in globally distributed chickpea root nodules Open
Legume nodules are specialized environments on plant roots that are generated and dominated by nitrogen-fixing bacteria. Bacteriophages (phages) in these nodules could potentially provide top-down controls on population size and, therefore…
View article: Quantitative Stable-Isotope Probing (qSIP) with Metagenomics Links Microbial Physiology and Activity to Soil Moisture in Mediterranean-Climate Grassland Ecosystems
Quantitative Stable-Isotope Probing (qSIP) with Metagenomics Links Microbial Physiology and Activity to Soil Moisture in Mediterranean-Climate Grassland Ecosystems Open
Soil moisture is a critical factor that strongly shapes the lifestyle of soil organisms by changing access to nutrients, controlling oxygen diffusion, and regulating the potential for mobility. We identified active microorganisms in three …
View article: Divergent microbial traits influence the transformation of living versus dead root inputs to soil carbon
Divergent microbial traits influence the transformation of living versus dead root inputs to soil carbon Open
Soil microorganisms influence the global carbon cycle by transforming plant inputs into soil organic carbon (SOC), but the microbial traits that facilitate this process are unresolved. While current theory and biogeochemical models suggest…
View article: Functional succession of actively growing soil microorganisms during rewetting is shaped by precipitation history
Functional succession of actively growing soil microorganisms during rewetting is shaped by precipitation history Open
Rewetting of seasonally dry soils induces a burst of microbial activity and carbon mineralization that changes nutrient availability and leads to succession. Yet the microbial functions that underpin this succession are not well described.…
View article: Quantitative stable-isotope probing (qSIP) with metagenomics links microbial physiology and activity to soil moisture in Mediterranean-climate grassland ecosystems
Quantitative stable-isotope probing (qSIP) with metagenomics links microbial physiology and activity to soil moisture in Mediterranean-climate grassland ecosystems Open
The growth and physiology of soil microorganisms, which play vital roles in biogeochemical cycling, are likely dependent on current and prior soil moisture levels. Here, we developed and applied a genome-resolved metagenomic implementation…
View article: Ecophysiological traits underlying microbial succession after rewetting of soil from different precipitation regimes
Ecophysiological traits underlying microbial succession after rewetting of soil from different precipitation regimes Open
<p>After the dry season in a Mediterranean climate grassland, the initial soil rewetting event causes a short period of high microbial activity, growth, and mortality. This wet up leads to microbial succession and community reassembl…
View article: Historical precipitation regimes structure the growth of soil microorganisms in three California annual grasslands
Historical precipitation regimes structure the growth of soil microorganisms in three California annual grasslands Open
<p>Earth system models project altered precipitation regimes across much of the globe. Soil microorganisms in Mediterranean climates must withstand both direct physiological stress during prolonged periods of low soil moisture and be…
View article: Soil habitat and drought shape microbial traits associated with mineral-associated soil carbon formation
Soil habitat and drought shape microbial traits associated with mineral-associated soil carbon formation Open
<p>Soil microorganisms are frontline managers of the terrestrial carbon cycle. To better understand and model their effects under a changing climate, it is critical to determine which microbial ecophysiological traits are associated …
View article: Active populations and growth of soil microorganisms are framed by mean annual precipitation in three California annual grasslands
Active populations and growth of soil microorganisms are framed by mean annual precipitation in three California annual grasslands Open
Earth system models project altered precipitation regimes across much of the globe; in California, the winter wet season is predicted to extend into spring, and the summer dry period to lengthen. How these precipitation trends will affect …
View article: The Functional Significance of Bacterial Predators
The Functional Significance of Bacterial Predators Open
The word “predator” may conjure images of leopards killing and eating impala on the African savannah or of great white sharks attacking elephant seals off the coast of California. But microorganisms are also predators, including bacteria t…
View article: The Functional Significance of Bacterial Predators
The Functional Significance of Bacterial Predators Open
Predation structures food webs, influences energy flow, and alters rates and pathways of nutrient cycling through ecosystems, effects that are well documented for macroscopic predators. In the microbial world, predatory bacteria are common…
View article: Measurement Error and Resolution in Quantitative Stable Isotope Probing: Implications for Experimental Design
Measurement Error and Resolution in Quantitative Stable Isotope Probing: Implications for Experimental Design Open
One of the biggest challenges in microbial ecology is correlating the identity of microorganisms with the roles they fulfill in natural environmental systems. Studies of microbes in pure culture reveal much about their genomic content and …
View article: How drought modulates carbon-use efficiency and soil carbon formation in rhizosphere, detritusphere, and bulk soils
How drought modulates carbon-use efficiency and soil carbon formation in rhizosphere, detritusphere, and bulk soils Open
<p>Carbon use efficiency (CUE) is theorized to be positively associated with the formation of microbially-derived, mineral-associated soil carbon.&#160; Yet few empirical studies have directly tested this relationship. Moreover, …
View article: Measurement error and resolution in quantitative stable isotope probing: implications for experimental design
Measurement error and resolution in quantitative stable isotope probing: implications for experimental design Open
Quantitative stable isotope probing (qSIP) estimates the degree of incorporation of an isotope tracer into nucleic acids of metabolically active organisms and can be applied to microorganisms growing in complex communities, such as the mic…
View article: Global-level population genomics reveals differential effects of geography and phylogeny on horizontal gene transfer in soil bacteria
Global-level population genomics reveals differential effects of geography and phylogeny on horizontal gene transfer in soil bacteria Open
Although microorganisms are known to dominate Earth’s biospheres and drive biogeochemical cycling, little is known about the geographic distributions of microbial populations or the environmental factors that pattern those distributions. W…
View article: Mesorhizobium prokka genome annotations
Mesorhizobium prokka genome annotations Open
General feature format (gff) files generated by prokka genome annotation software (version 1.3) of draft and single-scaffold genomes of bacteria from the genus Mesorhizobium, isolated from chickpea root nodules.
View article: Mesorhizobium biogeograph R-scripts data
Mesorhizobium biogeograph R-scripts data Open
All data and metadata required to run R scripts located here: https://github.com/alexgreenlon/meso_biogeo
View article: Rhizobiales-assigned draft genome orthology matrix
Rhizobiales-assigned draft genome orthology matrix Open
Table describing gene orthology between all draft and finished Mesorhizobium genomes determined to be of sufficient quality for species assignments. Orthology assignments generated using the roary pipeline.