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The unicellular blue-green alga Anacystis nidulans was exposed to ultraviolet radiation during several successive subcultures. The ultraviolet-trained strain so obtained was then compared with the untrained control and found to be relatively more resistant to ultraviolet, penicillin, and streptomycin, and more sensitive to isoni-azid. It was further characterized by decreased carotenoid/chlorophyll ratio and by not having fully overcome the division-inhibiting effect of ultraviolet radiation. It was able to grow better than the untrained strain in a medium containing high concentrations of nitrite as the sole nitrogen source.
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H. D. Kumar (1963) studied this question.
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