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Title: Rhizosphere Carbon Turnover from Cradle to Grave: The Role of Microbe–Plant Interactions

Other · · Rhizosphere Biology: Interactions Between Microbes and Plants Rhizosphere Biology
 [1];  [2];  [3];  [1];  [3];  [4];  [5];  [5];  [5];  [6];  [7]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  2. Science Center, AgResearch Ltd., Christchurch (New Zealand); Univ. of California, Berkeley, CA (United States)
  3. Univ. of California, Berkeley, CA (United States)
  4. Vrije Univ., Amsterdam (Netherlands)
  5. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  6. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of Oklahoma, Norman, OK (United States)
  7. Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
+ Show Author Affiliations

Plant roots are the primary source of organic materials that become stabilized in soil. While most root carbon is decomposed into carbon dioxide (CO2), the remainder typically undergoes multiple microbial transformations before it forms longer-term associations with soil minerals. However, the mechanisms by which roots affect microbial utilization of organic materials and subsequent mineral stabilization processes are poorly understood. It is well known that living roots increase the biomass of nearby microbial communities, and shape their population dynamics, diversity, and interactions. Community assembly and metabolic potential of these rhizosphere-enriched microorganisms are strongly influenced by the chemical composition of the exudates released by the host plant. The root exudate pools of plants undergo compositional changes as they grow, reproduce, and senesce. In the well-studied annual grasses Avena barbata and Avena fatua, this changing rhizosphere substrate pool and the “bloom” of organisms that respond are phylogenetically coherent; Acidobacteria and Actinobacteria are consistently depleted, whereas Alpha and Betaproteobacteria and Bacteroidetes are reliably enriched. When compared to non-root-influenced bulk soils, the responsive community is predictably less taxon-rich, yet forms more complex networks. Finally, these rhizosphere dynamics have significant downstream effects on the colonization of nearby soil minerals, degradation of prior season’s root litters, and the balance of stabilized versus lost soil carbon.

Research Organization:
Univ. of California, Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
DOE Contract Number:
SC0016427
OSTI ID:
1779100
Journal Information:
Rhizosphere Biology: Interactions Between Microbes and Plants Rhizosphere Biology, Journal Name: Rhizosphere Biology: Interactions Between Microbes and Plants Rhizosphere Biology
Publisher:
Springer Science and Business Media LLC
Country of Publication:
United States
Language:
English

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