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: In this paper, the effect of N-(2-chloro-4-pyridyl)-N′-phenylurea (4PU-30) on the growth and content of endogenous cytokinins of adenine type in tobacco (Nicotiana tabacum L.) callus was investigated.
Abstract: The effect of N-(2-chloro-4-pyridyl)-N′-phenylurea (4PU-30) on the growth and content of endogenous cytokinins of adenine type in tobacco (Nicotiana tabacum L.) callus was investigated. Biomass accumulation in calli grown on Murashige and Skoog (MS) medium with 4PU-30 was higher than that on MS medium with kinetin. The obvious presence of isopentenyladenine type cytokinins and traces of zeatin type cytokinins supposes modification in the endogenous cytokinin metabolism of the tobacco callus grown on 4PU-30.
TL;DR: In this article , the indole acetic acid (IAA) and zeatin hormone levels of the individuals were noted before and after the Alternaria disease inoculations in order to determine the hormonal variations during the research.
Abstract: Alternaria brown spot is a serious disease in mandarins and mandarin hybrids. In this particular research, 9 Alterneria tolerant and 2 susceptible mutant individuals obtained from a series of in vitro and in vivo studies were used. Endogenous indole acetic acid (IAA) and zeatin hormone levels of the individuals were noted before and after the Alternaria disease inoculations in order to determine the hormonal variations during the research. It was determined that endogenous zeatin levels decreased after the inoculation compared to its initial levels. The indole acetic acid levels of the individuals increased after inoculation except for some individuals.
13 Jan 2022
TL;DR: In this paper , photo-irradiation of an appropriately designed caged hormones enables the control and manipulation of the corresponding biological processes with high spatial and temporal resolution, allowing targeted perturbation of biological processes including degradation, glucosylation and recognition by appropriate enzymes.
Abstract: Photo-irradiation of an appropriately designed caged hormones enables the control and manipulation of the corresponding biological processes with high spatial and temporal resolution. Caged trans-zeatin of various types of nitrobenzene carbonate related photoremovable protecting groups have been synthesized. A rapid irradiation liberates the trapped trans-zeatin molecule, permitting targeted perturbation of biological processes including degradation, glucosylation and recognition by appropriate enzymes.
01 Jan 1982
TL;DR: Results are consistent with the hypothesis that the weak activity ofcytokinins withunsaturated side chains in promoting the growth of Great Northern callus isduetotherapid conversion of these cytokinins toinactive metabolites.
Abstract: Theactivities ofthefreebaseandribonucleoside formsofcytokinins bearing saturated andunsaturated N6-isoprenoid sidechains havebeen examined incallus cultures derived fromPhaseolus vulgaris cv.Great Northern, P.Iunatus cv.Kingston, andtheinterspecific hybrid Great Northern x Kingston. Incallus ofcv.GreatNorthern, cytokinins bearing saturated side chains (N6-isopentyladenine, N6-isopentyladenosine, dihydrozeatin, andribosyldihydrozeatin) werealways moreactive thanthe corresponding unsaturated analogs (N6-1A2-isopentenylladenine, N6-1A2isopentenylladenosine, zeatin, andribosylzeatin). Incallus ofcv.Kinston, thecytokinins bearing unsaturated side chains wereeither moreactive or equally asactive asthesaturated compounds. Thesedifferences incytokinin structure-activity relationships werecorrelated withdifferences in themetabolism of14C-N6-(A2-isopentenyl)adenosine. InGreatNorthern tissues, thiscytokinin wasrapidly degraded toadenosine; inKingston tissues, themajor metabolite wasthecorresponding nucleotide. Thegrowth responses ofcallus oftheinterspecific hybrid wereintermediate between theparental tissues, andthemetabolism of'4C-N6-(A2-isopentenyl)adenosine bythehybrid callus exhibited characteristics ofbothparental tissues. Theresults areconsistent withthehypothesis thattheweak activity ofcytokinins withunsaturated side chains inpromoting thegrowth ofGreat Northern callus isduetotherapid conversion ofthese cytokinins toinactive metabolites. callus tissues, io6Ade andi6Ade were30-to100-fold less active thantheir saturated analogs (hio6Ade andhi6Ade) inpromoting thegrowth ofthecytokinin-dependent