Energy requirements for growth and maintenance of Scenedesmus protuberans Fritsch in light-limited continuous cultures |
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Authors: | Herman J Gons Luuc R Mur |
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Institution: | (1) Laboratorium voor Microbiologie, Universiteit van Amsterdam, Nieuwe Achtergracht 127, 1018 WS Amsterdam, The Netherlands;(2) Present address: Limnologisch Instituut, Rijksstraatweg 6, 3631 AC Nieuwersluis, The Netherlands |
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Abstract: | Scenedesmus protuberans Fritsch was grown in light-limited continuous cultures with a light-dark cycle, at temperatures of 20° and 28° C. At 20° irradiances of 12 and 38 W m–2 were used, at 28° 38 W m–2.The relationships between growth rate and light uptake rate were of diphasic linear character. With the lower growth rates the relationships were defined with the parameters
e
, i.e. the specific maintenance rate constant, and c, the true efficiency of light energy conversion into biomass. The
e
-value was dependent on temperature, the c on irradiance.In cultures, incubated in prolonged darkness, decrease rates of biomass were comparable to the derived
e
-values.Both diphasic linear relationships between growth rate and light uptake rate and the same order of magnitude of
e
-values could be derived from literature data on other green algae. |
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Keywords: | Scenedesmus protuberans Fritsch Continuous culture Light limitation Temperature effect Irradiance effect Growth efficiency Maintenance energy Green algae |
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