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Cytokinins in Germinating Seeds of Phaseolus vulgaris L.: III. Transport and Metabolism of 8[¹⁴C] t-Zeatin Applied to the Cotyledons

M. J. HUTTON and J. VAN STADEN
Annals of Botany
Vol. 49, No. 5 (May 1982), pp. 701-706
Published by: Oxford University Press
Stable URL: http://www.jstor.org/stable/42756792
Page Count: 6
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Cytokinins in Germinating Seeds of Phaseolus vulgaris L.: III. Transport and Metabolism of 8[¹⁴C] t-Zeatin Applied to the Cotyledons
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Abstract

The application of 8[¹⁴C]t-zeatin to the cotyledons of germinating bean seeds demonstrated that cytokinins are not readily exported from the cotyledons to the embryonic axis during the early stages of this process. In the cotyledons the applied zeatin is metabolized extensively to metabolites which are polar and which occur at RF 0.2-0.5 on paper chromatograms. These metabolites are stable and are not readily exported from the cotyledons. In contrast the metabolites found at RF 0-0.2 are more readily exported. When exported to the radicles and plumules a large proportion of the translocated metabolites were converted to compounds which on paper co-chromatographed with zeatin. This seems to suggest that the embryonic axis has the capacity to synthesize cytokinins and that some of the metabolites formed during its catabolism can also be used for its synthesis.

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