The Interdependence of Photon Irradiance and Free Carbon Dioxide or Bicarbonate Concentration on the Photosynthetic Compensation Points of Freshwater Plants

The free CO2(CO2*) and HCO3 -compensation points of eight freshwater macrophytes and four phytoplankters were measured using a pH-drift technique developed by Allen and Spence (1981). Below a critical photon irradiance, which was about that at which net photosynthesis was half-maximal, CO2* and HCO3...

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Bibliographic Details
Published in:The New phytologist 1983-01, Vol.93 (1), p.1-12
Main Author: Maberly, S. C.
Format: Article
Language:English
Subjects:
Aquatic plants
Carbon dioxide
Fresh water
Freshwater
Irradiance
Macrophytes
Oxygen
Photons
Photosynthesis
Plant physiology
Plants
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Summary:The free CO2(CO2*) and HCO3 -compensation points of eight freshwater macrophytes and four phytoplankters were measured using a pH-drift technique developed by Allen and Spence (1981). Below a critical photon irradiance, which was about that at which net photosynthesis was half-maximal, CO2* and HCO3 -compensation points increased with decreasing photon irradiance. However, the CO2* compensation point of two species that were able to use HCO3 -were little or not affected by photon irradiance. The light compensation point increased at low CO2* or HCO3 -concentrations. The simultaneous generation by phytoplankton of light and carbon depletion could have a large deterimental effect on macrophyte performance.
ISSN:0028-646X
1469-8137
DOI:10.1111/j.1469-8137.1983.tb02686.x