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Stimulation of cytokinins and chlorophyll synthesis in cucumber cotyledons by triadimefon


Stimulation of cytokinins and chlorophyll synthesis in cucumber cotyledons by triadimefon



Physiologia Plantarum 66(2): 197-201



ISSN/ISBN: 0031-9317

DOI: 10.1111/j.1399-3054.1986.tb02408.x

Triadimefon [1-(4-chlorophenoxy)-3,3-dimethyl-1-(1,2,4-triazol-1-yl)-2-butanone] changes the morphology and partitioning of dry matter in cucumber (Cucumis sativus L. cv. National Pickling) seedlings. The dry weights, potassium and cytokinin levels in the cotyledons and roots of the treated seedlings were higher, whereas the hypocotyl weights were lower than the controls. When etiolated intact seedlings or cotyledons excised from triadimefon-pretreated dark-grown seedlings were exposed to light, chlorophyll synthesis in the pretreated cotyledons was stimulated. Triadimefon does not have cytokinin-like activity in the cucumber cotyledon greening bioassay, but appears to induce the plants to produce more cytokinins, probably by stimulating root growth. Hence it is proposed that the stimulation of chlorophyll production by triadimefon in cucumber cotyledons is mediated by maintaining high levels of potassium and cytokinins in the cotyledons.

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Accession: 001466470

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