Plant Physiol.
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Plant Physiology 65:363-367 (1980)
© 1980 American Society of Plant Biologists

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Articles

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

Giovanna Gregorini1,2 and Michel Laloue

Centre National de la Recherche Scientifique, Laboratoire G.P.D.P./P.C., 91190 Gif-sur-Yvette, France

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.

1 Supported by NATO Grant 216 564.

2 Present address: Instituto di Orticoltura e Floricoltura, Viale Piagge 23, 56 100, Pisa, Italy.




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[Abstract] [Full Text] [PDF]


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Copyright © 1980 by the American Society of Plant Biologists