Abstract
Three compounds with cytokinin activity have been isolated from the medium of Rhodospirillum rubrum grown photosynthetically. Two N-6 aminopurine cytokinins revealed in the medium were identical with those obtained from R. rubrum cells previously. The third compound with cytokinin activity in Amaranthus caudatus bioassay proved to be a simple phenolic compound with elemental composition C 8H 10O 2. This cytokinin-like substance according to absorption spectra, mass spectrometry and 1H NMR spectra data was identified as 4-hydroxyphenethyl alcohol.
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