Abstract
Prolific growth in cytokinin‐requiring apple cell suspensions was achieved during 10 days of culture with appropriate concentrations of benzyladenine (BA). Unlike the controls, BA‐treated cells showed a well developed sub‐cellular organization and protein synthesis. Upon transfer to fresh cytokinin‐free medium, however, these cells exhibited a rapid decrease in polyribosome formation, but with unchanged nuclear and nucleolar activities. Cells lacking added cytokinin showed a reduced metabolic activity and failed to divide. Deficiency in the translation process of cytokinin‐deprived cells was overcome by exogenous BA‐treatment. In cells maintained on a cytokinin‐free medium for 5 days, BA‐treatment enhanced protein synthesis from pre‐existing mRNA in a specific way.
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