Summary
After exposure of cells to N-methyl-N′-nitro-N-nitrosoguanidine a series of stable mutants of the marine coccoid blue-green alga, Agmenellum quadruplicatum, were isolated.
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1.
Two of these mutants were blocked at nitrate reductase and required nitrite or ammonium ion for growth.
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2.
Four of the mutants were blocked at nitrite reductase, required NH4 + for growth but had a functional nitrate reductase. These mutants readily reduced NO3 - to NO2 -.
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3.
Two of the mutants had altered phycocyanin/chlorophyll a ratios, together with slightly impaired growth rates.
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4.
Mutant AQ-19 responded to casamino acids and possibly represents an amino acid auxotroph.
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Stevens, S.E., Van Baalen, C. Growth characteristics of selected mutants of a coccoid blue-green alga. Archiv. Mikrobiol. 72, 1–8 (1970). https://doi.org/10.1007/BF00411008
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DOI: https://doi.org/10.1007/BF00411008