Abstract
Summary A description is given of changes which occured under the influence of cytokinins, chloramphenicol (CAP), eyeloheximide (CXD) and their combinations in chlorophyll synthesis and development of chloroplast structure in palisade parenchyma cells of cucumber cotyledons. Cytokinins distinctly promoted chlorophyll synthesis and chloroplast development, and the antibiotics inhibited these processes. The inhibiting activity of CXD was several times higher than that of CAP. Kinetin applied simultaneously with CAP only partially overcame its inhibitory effect, whereas in the case of CXD the overcoming was complete. It is suggested that the promotion by cytokinins of chloroplast development in cucumber cotyledons results mainly from their effect on protein synthesis occurring in the cytoplasm.
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