Abstract
Summary The effect of chronic UV-A and B irradiation with low intensity on growth and nicotine production was investigated in pith tissue callus cultures of Nicotiana tabacum L. Growth was not influenced by visible light, UV-A or UV-B under the irradiation conditions used. Nicotine production was suppressed by visible light. Within a certain dose range, UV-A stimulated nicotine production. UV-B showed no effect.
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