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Differential Exudation Creates Biogeochemically Distinct Microenvironments during Rhizosphere Evolution

Journal Article · · Environmental Science and Technology
 [1];  [2];  [2];  [3];  [4];  [5];  [6]
  1. University of Massachusetts, Amherst, MA (United States); Universite de Lausanne, Lausanne, Switzerland
  2. Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
  3. Franklin Pierce University, Rindge, NH (United States)
  4. University of Minnesota, MN (United States); Oregon State University, Corvallis, OR (United States)
  5. Marine Biological Laboratory, Woods Hole, MA (United States)
  6. University of Lausanne (Switzerland)
Plant roots and associated microbes release a diverse range of functionally distinct exudates into the surrounding rhizosphere with direct impacts on soil carbon storage, nutrient availability, and contaminant dynamics. Yet mechanistic linkages between root exudation and emergent biogeochemical processes remain challenging to measure nondestructively, in real soil, over time. Here we used a novel combination of in situ microsensors with high-resolution mass spectrometry to measure, nondestructively, changing exudation and associated biogeochemical dynamics along single growing plant roots (Avena sativa). We found that metabolite and dissolved organic carbon (DOC) concentrations as well as microbial growth, redox potential (EH), and pH dynamics vary significantly among bulk soil, root tip, and more mature root zones. Surprisingly, the significant spike of rhizosphere DOC upon root tip emergence did not significantly correlate with any biogeochemical parameters. However, the presence of sugars significantly correlated with declines in EH following the arrival of the root tip, likely due to enhanced microbial oxygen demand. Similarly, the presence of organic acids significantly correlated to declines in pH upon root tip emergence. Altogether, our in situ measurements highlight how different exudates released along growing roots create functionally distinct soil microenvironments that evolve over time.
Research Organization:
Marine Biological Laboratory, Woods Hole, MA (United States); Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Organization:
National Science Foundation (NSF); USDOE Office of Science (SC), Biological and Environmental Research (BER)
Grant/Contract Number:
AC05-76RL01830; SC0019142; SC0021093
OSTI ID:
2496301
Alternate ID(s):
OSTI ID: 2562149
Report Number(s):
PNNL-SA--197924
Journal Information:
Environmental Science and Technology, Journal Name: Environmental Science and Technology Journal Issue: 42 Vol. 58; ISSN 0013-936X
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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