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Processes 2017, 5(1), 11;

Photorespiration and Rate Synchronization in a Phototroph-Heterotroph Microbial Consortium

Department of Biological Sciences, Virginia Tech University, Blacksburg, VA 24061, USA
Center for Biofilm Engineering, Montana State University, Bozeman, MT 59717, USA
Department of Food, Environmental and Nutritional Sciences, Università degli Studi di Milano, 20133 Milano, Italy
Department of Mathematics, Temple University, Philadelphia, PA 19122, USA
Author to whom correspondence should be addressed.
Academic Editor: Hyun-Seob Song
Received: 25 November 2016 / Revised: 26 January 2017 / Accepted: 15 February 2017 / Published: 2 March 2017
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The process of oxygenic photosynthesis is robust and ubiquitous, relying centrally on input of light, carbon dioxide, and water, which in many environments are all abundantly available, and from which are produced, principally, oxygen and reduced organic carbon. However, photosynthetic machinery can be conflicted by the simultaneous presence of carbon dioxide and oxygen through a process sometimes called photorespiration. We present here a model of phototrophy, including competition for RuBisCO binding sites between oxygen and carbon dioxide, in a chemostat-based microbial population. The model connects to the idea of metabolic pathways to track carbon and degree of reduction through the system. We find decomposition of kinetics into elementary flux modes a mathematically natural way to study synchronization of mismatched rates of photon input and chemostat turnover. In the single species case, though total biomass is reduced by photorespiration, protection from excess light exposures and its consequences (oxidative and redox stress) may result. We also find the possibility that a consortium of phototrophs with heterotrophs can recycle photorespiration byproduct into increased biomass at the cost of increase in oxidative product (here, oxygen). View Full-Text
Keywords: photosynthesis; photorespiration; chemostat model; phototroph-heterotroph consortium photosynthesis; photorespiration; chemostat model; phototroph-heterotroph consortium

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El Moustaid, F.; Carlson, R.P.; Villa, F.; Klapper, I. Photorespiration and Rate Synchronization in a Phototroph-Heterotroph Microbial Consortium. Processes 2017, 5, 11.

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