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 CsHioO 2. This cytokininlike substance according to absorption spectra, mass spectrometry and IH NMR spectra data was identified as 4-hydroxyphenethyl alcohol.
Plant hormones from biomass of the purple non‐sulfur bacterium Rhodospiririllum rubrum were isolated for the first time. These compounds show high physiological activities (300–330%) in the cytokinin bioassay. All three detected cytokinins are adenine derivatives, according to spectral analysis. One of them was identified as 6‐(4‐hydroxy‐3‐methyl‐2‐trans‐2‐bytenylamino)‐9‐ß‐D‐ribofuranosylpurine (zeatinriboside) as shown by thin‐layer chromatography and reversed‐phase high‐performance liquid chromatography. The possible functions of bacterial cytokinins are also discussed.
Plant hormones from biomass of the purple non‐sulfur bacterium Rhodospiririllum rubrum were isolated for the first time. These compounds show high physiological activities (300–330%) in the cytokinin bioassay. All three detected cytokinins are adenine derivatives, according to spectral analysis. One of them was identified as 6‐(4‐hydroxy‐3‐methyl‐2‐trans‐2‐bytenylamino)‐9‐ß‐D‐ribofuranosylpurine (zeatinriboside) as shown by thin‐layer chromatography and reversed‐phase high‐performance liquid chromatography. The possible functions of bacterial cytokinins are also discussed.
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