Cytokinins in Germinating Seeds of Phaseolus vulgaris L. III. Transport and Metabolism of 8[14C]t-Zeatin Applied to the Radicle |
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Authors: | HUTTON, M. J. VAN STADEN, J. |
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Affiliation: | Department of Botany, University of Natal Pietermaritzburg 3200, Republic of South Africa |
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Abstract: | The application of 8[14C]t-zeatin to the cotyledons of germinatingbean seeds demonstrated that cytokinins are not readily exportedfrom the cotyledons to the embryonic axis during the early stagesof this process. In the cotyledons the applied zeatin is metabolizedextensively to metabolites which are polar and which occur atRF 0·20·5 on paper chromatograms. Thesemetabolites are stable and are not readily exported from thecotyledons. In contrast the metabolites found at RF 00·2are more readily exported. When exported to the radicles andplumules a large proportion of the translocated metaboliteswere converted to compounds which on paper co-chromatographedwith zeatin. This seems to suggest that the embryonic axis hasthe capacity to synthesize cytokinins and that some of the metabolitesformed during its catabolism can also be used for its synthesis. Phaseolus vulgaris, bean, germination, cytokinins, transport, cotyledons |
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