1887

Abstract

The effect of photon fluence rate on grown in Mg- and non-Mg-limited continuous cultures was studied. A decline in photon fluence rate from 445 to 30 μE m s resulted in a decrease of the mean cell volume from 2 to 0·8 μm in the Mg-limited culture. Compared with non-Mg-limited cultures, this was the only obvious difference found when decreasing the photon fluence rate. Altering the photon fluence rate for a Mg-limited chemostat therefore seems to be a suitable system for studies of the Mg-controlled events in cell division of . At constant dilution rate, the DNA content per unit cell volume was independent of photon fluence rate, while the RNA content decreased with this factor. The RNA/protein ratio decreased by a factor of 3 in both Mg- and non-Mg-limited cultures, when decreasing the photon fluence rate from 445 to 100 μE m s. The RNA efficiency therefore varied with photon fluence rate and the organism seemed to have surplus RNA at high light intensities.

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/content/journal/micro/10.1099/00221287-130-12-3079
1984-12-01
2021-10-28
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