Abstract
The development of virescent flowers as a result of the infestation of Catharanthus roseus plants by different “strains” of mycoplasmas could be correlated with marked changes in the levels of endogenous cytokinins within the flowers, mature leaves and roots of the plants. In all cases, the cytokinin levels in the roots and mature leaves decreased while that in the flowers increased. Three peaks of cytokinin activity which co-eluted with glucosylzeatin, ribosylzeatin and zeatin respectively were detected in these organs. No qualitative differences in the cytokinin complement of the infected plants were detected. At present it is not known whether or not the mycoplasmas used synthesize cytokinins which upset the cytokinin balance of Catharanthus roseus plants or are responsible for changes in the synthetic capacity and/or translocation pattern of the infested plants.
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