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Factors affecting pH-dependent photo-inhibition of division in Euglena gracilis

✍ Scribed by J. R. Cook; H. Kaiser Jr.

Publisher
John Wiley and Sons
Year
1973
Tongue
English
Weight
487 KB
Volume
82
Category
Article
ISSN
0021-9541

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✦ Synopsis

Abstract

Visible light of moderate intensity (1200 ft‐cd) can severely inhibit cell division of a non‐photosynthetic mutant of Euglena gracilis when growth is supported by butanol, ethanol, or fumarate as sole carbon source. The degree of inhibition is pH dependent, being greatest at pH 4 to 5. A wide variety of other carbon sources permitted growth in the light without inhibition.

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In the dark, growth rates of Euglena gracilis were independent of culture pH between the limits of three to eight. Visible light of moderate intensity inhibited growth rates, with the degree of inhibition being markedly pH dependent. The most severe inhibition was observed at pH 4 to 5 , with little