Studies on the oxidative assimilation of unicellular algae. I. Effect of sugars on the respiration of Chlorella vulgaris

Tóth, László (1965) Studies on the oxidative assimilation of unicellular algae. I. Effect of sugars on the respiration of Chlorella vulgaris. A Magyar Tudományos Akadémia Tihanyi Biológiai Kutatóintézetének évkönyve, 32. pp. 297-306. ISSN 0365-3005

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Abstract

A range of sugars have been tested as respiratory substrates using 7K Chlorella vulgaris Beyer, axenic strain of the Algal Collection of the Hungarian Biological Research Institute as test organism. Much higher rates of respiration were obtained with glucose, fructose, mannose and sucrose. Much smaller effect was observed with xylose, galactose and raffinose. Sustained respiration was not observable with any other sugars tested (arabinose, lyxose, ribose, sorbose, tagatose, rhamnose, melibiose, turanose, lactose, maltose and stachyose). The respiratory quotient of glucose respiration may be taken as 1.03. The pH between 4-7.4 was ineffective either on endogenous respiration rate or on the exogenous ones. The oxidative assimilation of starved resting cells of this strain is very good, only about 8 per cent of the absorbed glucose was completely oxidized, the remainder being presumably converted into algal dry matter. A considerable sucrose utilization is indicated by the intensive respiratory increase in consequence of sucrose, and its ecological wiev points are also emphasized.

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