Bioenergetic Controls on Microbial Ecophysiology in Marine Sediments

Frontiers in Microbiology
James A BradleyDouglas E LaRowe

Abstract

Marine sediments constitute one of the most energy-limited habitats on Earth, in which microorganisms persist over extraordinarily long timescales with very slow metabolisms. This habitat provides an ideal environment in which to study the energetic limits of life. However, the bioenergetic factors that can determine whether microorganisms will grow, lie dormant, or die, as well as the selective environmental pressures that determine energetic trade-offs between growth and maintenance activities, are not well understood. Numerical models will be pivotal in addressing these knowledge gaps. However, models rarely account for the variable physiological states of microorganisms and their demand for energy. Here, we review established modeling constructs for microbial growth rate, yield, maintenance, and physiological state, and then provide a new model that incorporates all of these factors. We discuss this new model in context with its future application to the marine subsurface. Understanding the factors that regulate cell death, physiological state changes, and the provenance of maintenance energy (i.e., endogenous versus exogenous metabolism), is crucial to the design of this model. Further, measurements of growth rate, growth ...Continue Reading

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Citations

Feb 20, 2020·Journal of Bacteriology·John A Ciemniecki, Dianne K Newman
Aug 4, 2018·Frontiers in Microbiology·Rose M JonesBeth N Orcutt
Nov 7, 2019·Environmental Microbiology·Alice ZhouWilliam D Leavitt
Oct 22, 2020·Journal of the Royal Society, Interface·P M Higgins, C S Cockell
Dec 18, 2020·Frontiers in Microbiology·Sean W MullinVictoria J Orphan

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