Mary K. Firestone
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View article: Reduced legacy precipitation decreases microbial community growth efficiency and alters soil organic carbon in a California grassland
Reduced legacy precipitation decreases microbial community growth efficiency and alters soil organic carbon in a California grassland Open
Changes in global patterns can leave a lasting legacy in semi-arid grasslands by reshaping microbial growth dynamics and carbon cycling during the first wet-up in the autumn, a period known for intense microbial activity and significant ca…
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: Quantitative stable isotope probing (qSIP) and cross-domain networks reveal bacterial-fungal interactions in the hyphosphere
Quantitative stable isotope probing (qSIP) and cross-domain networks reveal bacterial-fungal interactions in the hyphosphere Open
To date, our ability to associate microbial co-occurrence network patterns with biological interactions is limited, but the incorporation of qSIP allowed us to more precisely detect interacting partners by narrowing in on the taxa that wer…
View article: Codon bias, nucleotide selection, and genome size predict in situ bacterial growth rate and transcription in rewetted soil
Codon bias, nucleotide selection, and genome size predict in situ bacterial growth rate and transcription in rewetted soil Open
In soils, the first rain after a prolonged dry period represents a major pulse event impacting soil microbial community function, yet we lack a full understanding of the genomic traits associated with the microbial response to rewetting. G…
View article: Arbuscular mycorrhizal interactions and nutrient supply mediate floral trait variation and pollinator visitation
Arbuscular mycorrhizal interactions and nutrient supply mediate floral trait variation and pollinator visitation Open
Summary Floral traits, including floral display and nutritional rewards from pollen and nectar, drive pollinator visitation. Even within a single plant species, environmental factors can influence the quality and quantity of floral resourc…
View article: Nutrient and moisture limitations reveal keystone metabolites linking rhizosphere metabolomes and microbiomes
Nutrient and moisture limitations reveal keystone metabolites linking rhizosphere metabolomes and microbiomes Open
Plants release a wealth of metabolites into the rhizosphere that can shape the composition and activity of microbial communities in response to environmental stress. The connection between rhizodeposition and rhizosphere microbiome success…
View article: Codon bias, nucleotide selection, and genome size predict<i>in situ</i>bacterial growth rate and transcription in rewetted soil
Codon bias, nucleotide selection, and genome size predict<i>in situ</i>bacterial growth rate and transcription in rewetted soil Open
In soils, the first rain after a prolonged dry period greatly impacts soil microbial community function, yet we lack a full understanding of the genomic traits associated with the microbial response to rewetting. Genomic traits such as cod…
View article: Metatranscriptomes of California grassland soil microbial communities in response to rewetting
Metatranscriptomes of California grassland soil microbial communities in response to rewetting Open
When very dry soil is rewet, rapid stimulation of microbial activity has important implications for ecosystem biogeochemistry, yet associated changes in microbial transcription are poorly known. Here, we present metatranscriptomes of Calif…
View article: Intermediate soil acidification induces highest nitrous oxide emissions
Intermediate soil acidification induces highest nitrous oxide emissions Open
Global potent greenhouse gas nitrous oxide (N 2 O) emissions from soil are accelerating, with increases in the proportion of reactive nitrogen emitted as N 2 O, i.e., N 2 O emission factor (EF). Yet, the primary controls and underlying mec…
View article: Inhibition of autotrophic nitrifiers in soil by elevated CO2
Inhibition of autotrophic nitrifiers in soil by elevated CO2 Open
Autotrophic nitrifiers, by catalyzing the oxidation of ammonia to nitrate, play a vital role in the global nitrogen cycle 1–5. They convert carbon dioxide (CO2) into biomass 1,3,6 and, therefore, are expected to respond positively to incre…
View article: Arbuscular mycorrhiza convey significant plant carbon to a diverse hyphosphere microbial food web and mineral‐associated organic matter
Arbuscular mycorrhiza convey significant plant carbon to a diverse hyphosphere microbial food web and mineral‐associated organic matter Open
Summary Arbuscular mycorrhizal fungi (AMF) transport substantial plant carbon (C) that serves as a substrate for soil organisms, a precursor of soil organic matter (SOM), and a driver of soil microbial dynamics. Using two‐chamber microcosm…
View article: Soil microbial community response to corrinoids is shaped by a natural reservoir of vitamin B<sub>12</sub>
Soil microbial community response to corrinoids is shaped by a natural reservoir of vitamin B<sub>12</sub> Open
Soil microbial communities perform critical ecosystem services through the collective metabolic activities of numerous individual organisms. Most microbes use corrinoids, a structurally diverse family of cofactors related to vitamin B 12 .…
View article: Soil microbial community response to corrinoids is shaped by a natural reservoir of vitamin B12
Soil microbial community response to corrinoids is shaped by a natural reservoir of vitamin B12 Open
Soil microbial communities perform critical ecosystem services through the collective metabolic activities of numerous individual organisms. Most microbes use corrinoids, a structurally diverse family of cofactors related to vitamin B12. C…
View article: Intermediate soil acidification induces highest nitrous oxide emissions
Intermediate soil acidification induces highest nitrous oxide emissions Open
Global potent greenhouse gas nitrous oxide (N2O) emissions from soil are accelerating, with increases in the proportion of reactive nitrogen emitted as N2O, i.e., N2O emission factor (EF). Yet, the primary controls and underlying mechanism…
View article: Rhizosphere and detritusphere habitats modulate expression of soil N-cycling genes during plant development
Rhizosphere and detritusphere habitats modulate expression of soil N-cycling genes during plant development Open
Interactions between plant roots and rhizosphere bacteria modulate nitrogen (N)-cycling processes and create habitats rich in low molecular weight compounds (exudates) and complex organic molecules (decaying root litter) compared to those …
View article: Arbuscular mycorrhiza convey significant plant carbon to a diverse hyphosphere microbial food web and mineral-associated organic matter
Arbuscular mycorrhiza convey significant plant carbon to a diverse hyphosphere microbial food web and mineral-associated organic matter Open
Summary Arbuscular mycorrhizal fungi (AMF) transport substantial plant carbon (C) that serves as a substrate for other soil organisms, a precursor of soil organic matter (SOM), and a driver of soil microbial dynamics. Using two-chamber mic…
View article: Coupled anaerobic methane oxidation and metal reduction in soil under elevated <scp>CO</scp><sub>2</sub>
Coupled anaerobic methane oxidation and metal reduction in soil under elevated <span>CO</span><sub>2</sub> Open
Continued current emissions of carbon dioxide (CO 2 ) and methane (CH 4 ) by human activities will increase global atmospheric CO 2 and CH 4 concentrations and surface temperature significantly. Fields of paddy rice, the most important for…
View article: Expression of macromolecular organic nitrogen degrading enzymes identifies potential mediators of soil organic N availability to an annual grass
Expression of macromolecular organic nitrogen degrading enzymes identifies potential mediators of soil organic N availability to an annual grass Open
Nitrogen (N) is frequently limiting to plant growth, in part because most soil N is present as polymeric organic compounds that are not readily taken up by plants. Microbial depolymerization of these large macromolecular N-substrates gradu…
View article: Rhizosphere and detritusphere habitats modulate expression of soil N-cycling genes during plant development
Rhizosphere and detritusphere habitats modulate expression of soil N-cycling genes during plant development Open
Interactions between plant roots and rhizosphere bacteria mediate nitrogen (N)-cycling processes and create habitats rich in low molecular weight (growing roots, rhizosphere) and complex organic molecules (decaying root litter, detritusphe…
View article: Tracking transcription in soil microbial communities during the Birch Effect
Tracking transcription in soil microbial communities during the Birch Effect Open
In drought affected ecosystems, a large portion of the annually respired CO2 from soil may occur in the short period following the first rain event after drought. This process, where the rewetting of dry soil results in a pulse of CO­…
View article: Intermediate soil acidification induces highest nitrous oxide emissions
Intermediate soil acidification induces highest nitrous oxide emissions Open
Global emissions of the potent greenhouse gas nitrous oxide (N2O) from soil are accelerating, with increases in the proportion of reactive nitrogen (Nr) emitted as N2O, i.e., N2O emission factor (EF). Yet, the primary controls and underlyi…
View article: Spatial turnover of soil viral populations and genotypes overlain by cohesive responses to moisture in grasslands
Spatial turnover of soil viral populations and genotypes overlain by cohesive responses to moisture in grasslands Open
Viruses shape microbial communities, food web dynamics, and carbon and nutrient cycling in diverse ecosystems. However, little is known about the patterns and drivers of viral community composition, particularly in soil, precluding a predi…
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: A subset of viruses thrives following microbial resuscitation during rewetting of a seasonally dry California grassland soil
A subset of viruses thrives following microbial resuscitation during rewetting of a seasonally dry California grassland soil Open
Viruses are abundant, ubiquitous members of soil communities that kill microbial cells, but how they respond to perturbation of soil ecosystems is essentially unknown. Here, we investigated lineage-specific virus-host dynamics in grassland…