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Cyto kinins in xanthium strumarium distribution in the plant and production in the root system



Cyto kinins in xanthium strumarium distribution in the plant and production in the root system



Journal of Experimental Botany 27(101): 1268-1278



Cytokinins from leaf laminae, buds, petioles, stems, roots and root exudate of mature vegetative plants of X. strumarium L. were extracted, fractionated and partially characterized by means of column chromatography with Sephadex LH20. Two peaks of cytokinin activity with elution volumes corresponding to zeatin and zeatin riboside were detected, in varying concentrations, in all plant parts. A 3rd cytokinin, detected only in petioles and in expanding and mature leaves, eluted off the Sephadex column before zeatin riboside. This cytokinin (peak a) was converted to zeatin or to a zeatin-like cytokinin following both acid hydrolysis and treatment with .beta.-glucosidase. Peak a was not detected in buds or in the youngest developing leaves but was the predominant cytokinin present in half-expanded and more mature leaves. The zeatin riboside-like peak (peak b) constituted the major cytokinin in root exudate, apical buds, and the youngest developing leaves, while not greatly contributing to the cytokinin content of mature leaves. The de-topped root system was capable of cytokinin production. The distribution of cytokinins in the plant is discussed in relation to their probable origin in the root system.

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