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Plant and Cell Physiology, 1982, Vol. 23, No. 8 1371-1376
© 1982

Article

Effects of Cytokinin and Anticytokinin on the Initial Stage of Adventitious Bud Differentiation in the Epidermis of Torenia Stem Segments

Shizufumi Tanimoto and Hiroshi Harada

Institute of Biological Sciences, The University of Tsukuba Sakura-mura, Ibaraki 305, Japan

In the epidermis of Torenia stem segments cultured in vitro, meristematic zones (MZ) were initiated prior to adventitious bud differentiation. Application of benzyladenine (BA) stimulated MZ and bud formation, and the average number of MZ per epidermal strip increased linearly with rising concentrations of BA. The presence of naphthaleneacetic acid together with BA in the medium suppressed MZ formation. Some derivatives of 4-substituted-2-methylpyrrolo[2,3-d]pyrimidine which have anticytokinin activity inhibited BA-promoted MZ formation. Interactions of various cytokinins and anticytokinins in MZ and adventitious bud formation were also examined. The number of MZ formed by treatment with 5 µM BA was reduced 50% by the simultaneous application of one of the anticytokinins at the same concentration.

(Received June 19, 1982; Accepted September 27, 1982)
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