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Drought re-routes soil microbial carbon metabolism towards emission of volatile metabolites in an artificial tropical rainforest

Journal Article · · Nature Microbiology
 [1];  [2];  [3];  [4];  [1];  [5];  [5];  [1];  [6];  [7];  [7];  [7];  [8];  [9];  [1];  [1];  [10];  [11];  [12];  [6] more »;  [11];  [13];  [14];  [11];  [1];  [1] « less
  1. Univ. of Arizona, Tucson, AZ (United States)
  2. Univ. of Freiburg (Germany); Max Planck Society, Mainz (Germany). Max Planck Inst. for Chemistry
  3. Univ. of Freiburg (Germany); Univ. Innsbruck (Austria)
  4. Univ. of California, Davis, CA (United States); Univ. of Arizona, Tucson, AZ (United States)
  5. USDOE Joint Genome Institute (JGI), Walnut Creek, CA (United States)
  6. Univ. of Tubingen (Germany)
  7. Pacific Northwest National Laboratory (PNNL), Richland, WA (United States). Environmental Molecular Sciences Laboratory (EMSL)
  8. Aerodyne Research, Inc., Billerica, MA (United States); Bruker Daltonics Inc., Billerica, MA (United States)
  9. Aerodyne Research, Inc., Billerica, MA (United States)
  10. Univ. of California, Berkeley, CA (United States); Max Planck Society, Mainz (Germany). Max Planck Inst. for Chemistry
  11. Univ. of Freiburg (Germany)
  12. Univ. Innsbruck (Austria)
  13. Max Planck Society, Mainz (Germany). Max Planck Inst. for Chemistry
  14. Univ. of Freiburg (Germany); Univ. of Basel (Switzerland)
Drought impacts on microbial activity can alter soil carbon fate and lead to the loss of stored carbon to the atmosphere as CO2 and volatile organic compounds (VOCs). Here we examined drought impacts on carbon allocation by soil microbes in the Biosphere 2 artificial tropical rainforest by tracking 13C from position-specific 13C-pyruvate into CO2 and VOCs in parallel with multi-omics. During drought, efflux of 13C-enriched acetate, acetone and C4H6O2 (diacetyl) increased. These changes represent increased production and buildup of intermediate metabolites driven by decreased carbon cycling efficiency. Simultaneously,13C-CO2 efflux decreased, driven by a decrease in microbial activity. However, the microbial carbon allocation to energy gain relative to biosynthesis was unchanged, signifying maintained energy demand for biosynthesis of VOCs and other drought-stress-induced pathways. Overall, while carbon loss to the atmosphere via CO2 decreased during drought, carbon loss via efflux of VOCs increased, indicating microbially induced shifts in soil carbon fate.
Research Organization:
Environmental Molecular Sciences Laboratory (EMSL), Richland, WA (United States); Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Organization:
National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF); USDOE Office of Science (SC), Biological and Environmental Research (BER)
Grant/Contract Number:
AC02-05CH11231; AC05-76RL01830; SC0021349; SC0023189
OSTI ID:
2036569
Report Number(s):
PNNL-SA--176253
Journal Information:
Nature Microbiology, Journal Name: Nature Microbiology Journal Issue: 8 Vol. 8; ISSN 2058-5276
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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