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We have studied the biological effects of two structural analogs of cytokinins, 3-methyl-7-(pentylamino)pyrazolo(4,3-d)pyrimidine and 3-methyl-7-(benzylamino)pyrazolo(4,3-d)pyrimidine, on tobacco cell suspension cultures. These two cytokinin analogs are highly inhibitory to cytokinin-autonomous and cytokinin-requiring tobacco cells. The growth inhibitory effect is markedly antagonized by benzyladenine, but not by adenine. Cell suspensions of tobacco cells of a cytokinin-autonomous strain become cytokinin-dependent in the presence of 0.1 micromolar 3-methyl-7-(benzylamino)pyrazolo(4,3-d)pyrimidine. It is also demonstrated that growth inhibition of cell suspension cultures is accompanied by cell death and that only dividing cells are sensitive to this cytotoxic effect.

plant physiology

Biological Effects of Cytokinin Antagonists 7-(Pentylamino) and 7-(Benzylamino)-3-Methylpyrazolo(4,3-<i>d</i>)Pyrimidines on Suspension-cultured Tobacco Cells

Biological Effects of Cytokinin Antagonists 7-(Pentylamino) and 7-(Benzylamino)-3-Methylpyrazolo(4,3-d)Pyrimidines on Suspension-cultured Tobacco Cells