scispace - formally typeset
Search or ask a question
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.


Papers
More filters
01 Jan 2008
TL;DR: The reduced amount of auxin and gibberellins exported from leaves and typically favouring vegetative growth, in combination with increased levels of cytokinins in buds, known to support floral bud development, might play a key role in flower induction not only in longan, but also for other perennial fruit tree crops.
Abstract: Flower induction in longan (Dimocarpus longan L.) following the application of 8 gKClO3 m–2 canopy as soil drench at mature leaf stage was associated with a) increased concentrations of the cytokinins zeatin and zeatinriboside in both the bud meristem and the surrounding leaf primordia around 7 to 10 days before first flowers appeared; b) reduced leaf stomatal conductance, transpiration and net CO2 assimilation; c) a transient increase in leaf ethylene evolution, and d) lower export rates of gibberellins, auxin, abscisic acid, and zeatin and zeatinriboside from leaves. The reduced amount of auxin and gibberellins exported from leaves and typically favouring vegetative growth, in combination with increased levels of cytokinins in buds, known to support floral bud development, might play a key role in flower induction not only in longan, but also for other perennial fruit tree crops.

14 citations

Journal ArticleDOI
TL;DR: The findings suggest that the enzyme may be involved in the nuclear-cytoplasmic transport of cytokinins and related molecules or, possibly, with chromatin of rapidly dividing cells.
Abstract: Zeatin O-xylosyltransferase (EC 2.4.2.-) mediates the formation of O-xylosylzeatin from trans-zeatin and UDP-xylose in immature seeds of Phaseolus vulgaris. Tissue printing with a monoclonal antibody specific for the enzyme and a cDNA probe demonstrated that the enzyme was primarily localized and synthesized in the endosperm. Immunolocalization performed on monolayer endosperm at the free-nuclei stage and on EM sections demonstrated that the enzyme was associated with the nucleus as well as with the cytoplasm. Immunoanalysis of nuclear fractions revealed that the enzyme was retained in the nuclear pellet. Western analysis also showed that the enzyme was present in the nuclei of cotyledons and endosperm callus. The findings suggest that the enzyme may be involved in the nuclear-cytoplasmic transport of cytokinins and related molecules or, possibly, with chromatin of rapidly dividing cells.

14 citations

Journal ArticleDOI
TL;DR: The results allow for the hypothesis that wheat plant resistance is controlled by antagonistic interaction of signaling pathways of salicylic acid and ethylene with participation of cytokinins.
Abstract: Effects of ethephon (2-chloroethylphosphonic acid, ET), which is a producer of ethylene, and 1-methylcyclopropene (1-MCP), which inhibits ethylene binding with the corresponding receptors, on defense responses caused by the causal agent of leaf blotch (Septoria nodorum Berk.) in leaves of soft spring wheat (Triticum aestivum L.) of cultivars contrast in the resistance to the pathogen were studied. After treatment with 1-MCP, an induction of wheat resistance to the disease, more prominent in the susceptible cv. Kazakhstanskaya 10 than in the resistant cv. Omskaya 35, was found. The rise in the resistance was accompanied by rise in zeatin content in leaves, enhanced generation of hydrogen peroxide (most likely, due to the decreased catalase activity and increased peroxidase activity), and accumulation of transcripts of marker genes of the salicylate signaling pathway (PR-1 and PR-2). On the contrary, in ET-treated plants, all the studied defense responses were inhibited, and the pathogen developed more intensively. The effect of ethylene on zeatin distribution in infected wheat leaves of the susceptible cv. Kazakhstanskaya 10 was also found. In the 1-MCP-treated wheat leaves, cytokinins were localized in mesophyll cells and cell walls. In the ET-treated leaves, cell walls were free of zeatin, and the hormone concentrated in developing hyphae of the pathogen. The results allow for the hypothesis that wheat plant resistance is controlled by antagonistic interaction of signaling pathways of salicylic acid and ethylene with participation of cytokinins.

14 citations

Journal ArticleDOI
TL;DR: The increase in the amounts of the cytokinin corresponding to zeatin in extracts as bioassayed on paper chromatogram coincided with the increase in fresh weight, suggesting promotive effect of the endogenous cytokinins for fruit growth.
Abstract: Promotive effects of endogenous and exogenous cytokinins on the growth of cucumber fruits (Cucumis sativus L. cv. Chojitsuochiai No. 2) were examined.Cytokinin activity in decreasing order was: N6-benzyl adenine (BA), N6-isoamyl adenine (iso Am), _??_2-isopentenyladenine (2iP), trans-zeatin (t-Z), cis-zeatin (c-Z) and kinetin (K).The endogenous cytokinin levels in the cucumber fruits were examined in relation to fruit growth using the Amaranthus assay. The increase in the amounts of the cytokinins corresponding to zeatin in extracts as bioassayed on paper chromatogram coincided with the increase in fresh weight, suggesting promotive effect of the endogenous cytokinins for fruit growth.

14 citations


Network Information
Related Topics (5)
Abscisic acid
12.8K papers, 587K citations
88% related
Shoot
32.1K papers, 693.3K citations
86% related
Arabidopsis thaliana
19.1K papers, 1M citations
84% related
Photosynthesis
19.7K papers, 895.1K citations
83% related
Arabidopsis
30.9K papers, 2.1M citations
82% related
Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202333
2022103
202135
202034
201932
201848