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Bouskill NJ, Wood TE, Baran R, et al. Belowground Response to Drought in a Tropical Forest Soil. I. Changes in Microbial Functional Potential and Metabolism. Front Microbiol. 2016;7:525doi: 10.3389/fmicb.2016.00525.
Bouskill, N. J., Wood, T. E., Baran, R., Ye, Z., Bowen, B. P., Lim, H., Zhou, J., Nostrand, J. D., Nico, P., Northen, T. R., Silver, W. L., & Brodie, E. L. (2016). Belowground Response to Drought in a Tropical Forest Soil. I. Changes in Microbial Functional Potential and Metabolism. Frontiers in microbiology, 7525. https://doi.org/10.3389/fmicb.2016.00525
Bouskill, Nicholas J, et al. "Belowground Response to Drought in a Tropical Forest Soil. I. Changes in Microbial Functional Potential and Metabolism." Frontiers in microbiology vol. 7 (2016): 525. doi: https://doi.org/10.3389/fmicb.2016.00525
Bouskill NJ, Wood TE, Baran R, Ye Z, Bowen BP, Lim H, Zhou J, Nostrand JD, Nico P, Northen TR, Silver WL, Brodie EL. Belowground Response to Drought in a Tropical Forest Soil. I. Changes in Microbial Functional Potential and Metabolism. Front Microbiol. 2016 Apr 20;7:525. doi: 10.3389/fmicb.2016.00525. eCollection 2016. PMID: 27148214; PMCID: PMC4837414.
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Front Microbiol. 2016 Apr 20;7:525. doi: 10.3389/fmicb.2016.00525. eCollection 2016.

Belowground Response to Drought in a Tropical Forest Soil. I. Changes in Microbial Functional Potential and Metabolism.

Frontiers in microbiology

Nicholas J Bouskill, Tana E Wood, Richard Baran, Zaw Ye, Benjamin P Bowen, HsiaoChien Lim, Jizhong Zhou, Joy D Van Nostrand, Peter Nico, Trent R Northen, Whendee L Silver, Eoin L Brodie

Affiliations

  1. Earth Sciences Division, Ecology Department, Lawrence Berkeley National Laboratory Berkeley, CA, USA.
  2. International Institute of Tropical Forestry, USDA Forest ServiceRio Piedras, PR, USA; Fundación Puertorriqueña de ConservaciónSan Juan, PR, USA.
  3. Life Sciences Division, Lawrence Berkeley National Laboratory Berkeley, CA, USA.
  4. Earth Sciences Division, Ecology Department, Lawrence Berkeley National LaboratoryBerkeley, CA, USA; Institute for Environmental Genomics and Department of Microbiology and Plant Biology, University of OklahomaNorman, OK, USA; State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua UniversityBeijing, China.
  5. Institute for Environmental Genomics and Department of Microbiology and Plant Biology, University of Oklahoma Norman, OK, USA.
  6. Department of Environmental Science, Policy and Management, University of California-Berkeley Berkeley, CA, USA.
  7. Earth Sciences Division, Ecology Department, Lawrence Berkeley National LaboratoryBerkeley, CA, USA; Department of Environmental Science, Policy and Management, University of California-BerkeleyBerkeley, CA, USA.

PMID: 27148214 PMCID: PMC4837414 DOI: 10.3389/fmicb.2016.00525

Abstract

Global climate models predict a future of increased severity of drought in many tropical forests. Soil microbes are central to the balance of these systems as sources or sinks of atmospheric carbon (C), yet how they respond metabolically to drought is not well-understood. We simulated drought in the typically aseasonal Luquillo Experimental Forest, Puerto Rico, by intercepting precipitation falling through the forest canopy. This approach reduced soil moisture by 13% and water potential by 0.14 MPa (from -0.2 to -0.34). Previous results from this experiment have demonstrated that the diversity and composition of these soil microbial communities are sensitive to even small changes in soil water. Here, we show prolonged drought significantly alters the functional potential of the community and provokes a clear osmotic stress response, including the production of compatible solutes that increase intracellular C demand. Subsequently, a microbial population emerges with a greater capacity for extracellular enzyme production targeting macromolecular carbon. Significantly, some of these drought-induced functional shifts in the soil microbiota are attenuated by prior exposure to a short-term drought suggesting that acclimation may occur despite a lack of longer-term drought history.

Keywords: drought; functional gene microarray; microbial ecology; osmolytes; tropical forests

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