Effects of Bicarbonate and Carbon Dioxide on the Competition between Chlorella vulgaris and Spirulina platensis

概要

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A concentration of 0.05 M bicarbonate and over exerted an increasingly inhibitory effect on the growth of Chlorella vulgaris, whereas a concentration lower than 0.1 M decreased the growth rate of Spirulina platensis. In a medium containing 0.15 M bicarbonate and 0.05 M NaCl, in which the growth of Chlorella was curtailed, it was possible to maintain a mixed, continuous culture of Chlorella and Spirulina at steady state. Carbon dioxide also exerted a decisive influence on the outcome of the competition between the two algae. In a mixed culture at steady state, an immediate and sharp decline in the population of Chlorella was evident as soon as CO_2 bubbling was withheld. Prevention of the rise in pH did not prevent the fast increase in the number of Chlorella cells. When the supply of CO_2 was resumed just before Chlorella was washed out, a complete recovery of the population of Chlorella took place. The growth of Chlorella in above 0.1 M bicarbonate was only possible when gaseous CO_2 was passed through the medium. High bicarbonate content and low concentrations of gaseous CO_2 were identified as the major factors that prevented the contamination of Spirulina cultures by Chlorella.
日本植物生理学会の論文