Topic
Zeatin
About: Zeatin is a research topic. Over the lifetime, 2467 publications have been published within this topic receiving 64092 citations. The topic is also known as: Zeatin & (E/Z)-zeatin.
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TL;DR: The data show that hormone-independent calluses and cell suspensions can retain some sensitivity to growth hormones, however, differences of responses were observed between the auxin-dependent lines and the habituated lines.
Abstract: Fully habituated organogenic and nonorganogenic sugarbeet calluses reacted to application of the synthetic auxin [3-benzo(b) selenienyl] acetic acid by changes in growth and ethylene production. Treatment of fully habituated cells of periwinkle with 2,4-dichlorophenoxyacetic acid led to the decrease of free cytokinin contents (isopentenyl adenine, zeatin riboside, and zeatin) during the late exponential phase of growth. The polyamine contents were also modified and the capacity to biotransform secologanin into ajmalicine was decreased. Treatment of the habituated periwinkle cells with zeatin greatly increased the amount of a polypeptide of 16 kDa; this response was more marked than that displayed by the auxin-dependent line. These data show that hormone-independent calluses and cell suspensions can retain some sensitivity to growth hormones. However, differences of responses were observed between the auxin-dependent lines and the habituated lines.
17 citations
TL;DR: Eight species of mosses studied were divided into two groups on the basis of their developmental responses to ribosyl-trans-zeatin and Agro-bacterium tumefaciens B(6), and characteristics of protonemal growth common to each of these two groups are described.
Abstract: Eight species of mosses studied were divided into two groups on the basis of their developmental responses to ribosyl-trans-zeatin and Agro-bacterium tumefaciens B6. All eight produced either gametophores or callus on the protonema in response to 6-(γ,γ-dimethylallylamino) purine and trans-zeatin. Three which produced normal gametophores with A. tumefaciens yielded callus or abnormal gametophores with ribosyl-trans-zeatin. Ribosyl-trans-zeatin and A. tumefaciens were relatively ineffective on five other mosses. Characteristics of protonemal growth common to each of these two groups are described.
17 citations
TL;DR: O-Glycosylation of zeatin occurs widely in plant tissues and is likely to be important in regulating the level of active cytokinins.
Abstract: Zeatin is a highly active and ubiquitous cytokinin. O-Glycosylation of zeatin occurs widely in plant tissues and is likely to be important in regulating the level of active cytokinins. Enzymes mediating the conversion of zeatin to O-glucosylzeatin and O-xylosylzeatin have been isolated from Phaseolus seeds. The corresponding genes have been cloned recently. The current status of molecular and biochemical studies of these genes and enzymes is summarised in this paper.
17 citations
TL;DR: Eight cytokinins were detected in germinated chick-pea seeds and two cytokinin glycosides were present at advanced stages of germination: zeatin glucoside and glycosil zeat in riboside.
17 citations
TL;DR: The 3-, 7-and 9-Monomethylderivative des Cytokinins Zeatin wurden hergestellt und ihre Aktivitat in der Karottenwurzel nachgewiesen as mentioned in this paper.
Abstract: Die 3-, 7- und 9-Monomethylderivative des Cytokinins Zeatin wurden hergestellt und ihre Aktivitat in der Karottenwurzel nachgewiesen. Die Ergebnisse zeigen, dass die Nukleotidderivative nicht not-wendige Stufen im Wirkungsmechanismus darstellen.
17 citations