Electronic Resource
Oxford, UK
:
Blackwell Publishing Ltd
Plant, cell & environment
8 (1985), S. 0
ISSN:
1365-3040
Source:
Blackwell Publishing Journal Backfiles 1879-2005
Topics:
Biology
Notes:
Abstract This paper describes a dynamic model for photosynthesis by an aquatic plant, Egeria densa. The model takes into account an HCO−3 pump, high diffusion resistances and PEP carboxylase, and develops a set of differential equations to form the time-dependent solutions for photosynthesis. The predicted changes in pH, [CO2]aq and total inorganic carbon are compared with experimental data and the model is found to describe the data.The model is then used to examine the effect of O2 on photosynthesis under these conditions, and shows that the increase in internal CO2 concentration due to the recycling of photorespiratory CO2 directly stimulates gross CO2 fixation and can more than compensate for the O2 inhibition of gross photosynthesis. The importance of the HCO−3 pump in O2 inhibition is also examined.The CO2 compensation point (where inorganic carbon influx and efflux are equal) is examined and the importance of the HCO−3 pump and PEP carboxylase in reducing the compensation concentration is discussed.The model was developed in order to study the photosynthesis of an aquatic weed, which will be reported in a later paper.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1111/1365-3040.ep11611677
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