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Title: Biochemical modeling of microbial memory effects and catabolite repression on soil organic carbon compounds

Journal Article · · Soil Biology and Biochemistry
ORCiD logo [1];  [2];  [1]
  1. Univ. of Sydney, NSW (Australia). Laboratory for Environmental Engineering, School of Civil Engineering
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Earth and Environmental Sciences Area
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Microbial decomposition of Soil Organic Matter (SOM) is largely controlled by environmental and edaphic factors such as temperature, pH, and moisture. However, microbial metabolism is controlled by catabolite repression, which leads microbes to grow on preferred nutrient and energy sources first. In particular, Catabolite Repression for Carbon (CR-C) defines the hierarchical preference of bacteria for particular C sources. This control depends on the presence of signal molecules conferring bacteria a memory for recent growth conditions on less preferred C sources. The combined effect of catabolite repression and microbial memory (called here Memory-Associated Catabolite Repression for Carbon, MACR-C) has not yet been investigated in detail. First, we use observations and a numerical model to test the hypothesis that MACR-C explains substrate preferential consumption in a simple, 2-C substrate system, whereas Michaelis-Menten-Monod kinetics of competitive substrate consumption, non-competitive inhibition, or their combination, do not. Next, we carry out numerical analyses to explore the sensitivity of (1) estimated parameters to experimental observations and (2) model structure to steady-state substrate concentration under pulse or continuous substrate application. Our results show that MACR-C substantially affected substrate consumption and microbial readiness to switch between C sources.

Research Organization:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1477795
Alternate ID(s):
OSTI ID: 1571947; OSTI ID: 1636115
Journal Information:
Soil Biology and Biochemistry, Vol. 128, Issue C; ISSN 0038-0717
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 8 works
Citation information provided by
Web of Science

Figures / Tables (10)

Figure 1(p. 17)figure Figure 1
Figure 2(p. 18)figure Figure 2
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Figure 4(p. 19)figure Figure 4
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Figure 6(p. 21)figure Figure 6
Figure 7(p. 21)figure Figure 7
Figure 8(p. 22)figure Figure 8
Figure 9(p. 22)figure Figure 9
Table 1(p. 23)table Table 1

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Related Subjects

54 ENVIRONMENTAL SCIENCES
59 BASIC BIOLOGICAL SCIENCES
Diauxic growth
Catabolite repression
Substrate preferential consumption
Michaelis-menten-monod
Carbon
Soil organic matter