BEGIN:VCALENDAR VERSION:2.0 PRODID:icalendar-ruby CALSCALE:GREGORIAN X-WR-CALNAME:ESS Seminar Series: Dr. Laura Meredith"\; Sensitivity of s oil microbial volatile organic compound metabolism to drought and rewet” X-WR-TIMEZONE:Pacific Time (US & Canada) BEGIN:VEVENT DTSTAMP:20260720T154905Z UID:tag:localist.com\,2008:EventInstance_40081753149917 DTSTART:20220602T183000Z DTEND:20220602T193000Z DESCRIPTION:“Sensitivity of soil microbial volatile organic compound meta bolism to drought and rewet”Soil microbes cycle volatile organic compoun ds (VOCs) as metabolites and signaling molecules\, and VOCs represent the volatile portion of their metabolome coined the ‘volatilome’. Soil sou rces and sinks of VOCs contribute to ecosystem-scale interactions with the atmosphere where VOCs influence air quality and cloud formation. Identify ing microbial VOC pathways and their behavior in the environment is founda tional to understanding and predicting soil VOC fluxes\, including their r esponses to environmental drivers such as drought. \n\nTo explore the sens itivity of microbial soil VOC metabolism to drought\, we conducted an ecos ystem-scale drought in the tropical rainforest biome at the University of Arizona Biosphere 2 during the 5-month Water\, Atmosphere\, and Life Dynam ics (WALD) campaign. Within the context of this campaign\, we designed exp eriments to quantify soil VOC fluxes via autochambers and subsurface soil VOC concentrations using our recently developed non-invasive\, online soil gas sampling approach. Moreover\, to identify the up- and down-regulation of microbial VOC cycling\, we used a combination of 13C stable isotope la beling and ‘omics approaches that characterize the gene content (metagen omes)\, gene expression (metatranscriptomes)\, and organic matter composit ion (metabolomics) of soil. \n\nWe observed dynamic and diverse patterns i n soil VOC fluxes in response to drought and rewet. Soil microbes consumed atmospheric isoprene and monoterpenes. Other VOCs exhibited a strong flux enhancement in response to rewetting\, including both increased emissions (e.g.\, dimethyl sulfide) and uptake (e.g. acetone). Stable isotope label ing revealed surprising up-regulation of VOC-producing fermentation pathwa ys during drought. With the ongoing integrative analysis of these data\, w e aim to contribute to the growing understanding of microbial VOC pathways in soil and their sensitivity to shifts in ecosystem moisture conditions. \n\n \n\n \n\n Bio \n\nDr. Laura Meredith\, is an assistant professor at t he University of Arizona BIO5 Institute and School of Natural Resources an d the Environment. She leads a research team that focuses on resolving gen e to function links in microbial trace gas metabolism\, developing improve d methods for sensing trace gas signals in the soil\, and scaling microbia l processes driving biosphere-atmosphere trace gas exchange.\n\nDr. Meredi th received her PhD from the Massachusetts Institute of Technology Program on Oceans\, Atmospheres\, and Climate. She was awarded the Carl-Gustaf Ro ssby Prize for her dissertation work that pioneered measurements of biosph ere-atmosphere H2 exchange\, leading to new constraints on microbial drive rs of the overwhelming H2 soil sink. She was awarded a NSF Postdoctoral Re search Fellowship in 2013 to work at Stanford University to resolve genomi c underpinnings of the microbial capacity to drive soil-atmosphere exchang e of atmospheric carbonyl sulfide (OCS) and CO2 oxygen isotopes—two prom ising carbon cycle tracers. In 2015\, she joined the University of Arizona \, as a postdoc to study shifts in soil microbial CH4 cycling to land use in the Brazilian Amazon using stable isotopes. In 2017\, she joined the fa culty of the University of Arizona as an Assistant Professor of Ecosystem Genomics and Director of Rainforest Research at Biosphere 2. \n\nDr. Mered ith received the NSF CAREER award in 2021 and has been awarded grants from NSF Atmospheric Chemistry\, NSF Signals in the Soil\, and DOE Biological and Environmental Research programs. In 2019-2020\, she co-led the Water\, Atmosphere\, and Life Dynamics Campaign (WALD)\, a controlled whole-ecosy stem drought and rewet campaign in the Tropical Rainforest biome at Biosph ere 2 that involved ecosystem-scale isotope labeling. Dr. Meredith’s wor k has been recognized by various media outlets including Science Magazine\ , NPR Science Friday\, BBC and others. \n\nWebsites:\n\nhttps://www.lauram eredith.com/\n\nTwitter: @DrLauraMeredith\n\n \n\nNext week we will end th e spring seminar series with a VIRTUAL seminar format. Please join us Thu rsday for our Spring Seminar Series with our guest speaker Laura Meredith\ , Ph.D. A special thanks to Professor Paula Welander for bringing this spe aker to us for this seminar. Also\, thanks to Professor Morgan O’Neill & Professor Jamie Jones for co-instructing and running this Seminar Series this Spring by bringing you experts in the fields as we learn from them. LOCATION: SUMMARY:ESS Seminar Series: Dr. Laura Meredith"\; Sensitivity of soil m icrobial volatile organic compound metabolism to drought and rewet” URL;VALUE=URI:https://events.stanford.edu/event/ess_seminar_series_dr_laura _meredithquot_sensitivity_of_soil_microbial_volatile_organic_compound_meta bolism_to_drought_and_rewet CATEGORIES:Class/Seminar CATEGORIES:Lecture/Presentation/Talk END:VEVENT END:VCALENDAR