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Topic: Cytokinin

Related Topics

Gibberellin

Auxin

Plant hormone

Abscisic acid

Meristem

Kormoran

Yaletown

British

Brassinosteroids

	Cytokinin
		Cytokinins (like auxins) are defined more by their biological activity (inducing cell division in tissue culture) rather than by structure
		Cytokinins are primarily synthesized in the root apical meristem, then are transported through the plant in the xylem sap
		cytokinin up-regulates the expression of a cyclin gene
	www.esf.edu /efb/course/EFB530/lectures/cytokini.htm (558 words)

	[No title]
		Particularly, cytokinin is altered during shifts in C and N metabolism, mineral nutrition imbalances, pathogenesis, various biochemical mutations and ectopic expression of many genes in transgenic plants.
		Cytokinin should be sep arated from the other plant components, the cytokinin should be preserved in all their native forms, and the various forms of the cytokinin should be separated from each other, identified unambiguously and quantified.
		The cytokinin forms are dissolved in 100 \'b5L of 1 N KOH, diluted in 20 mL of water and adjusted to pH 7.8.
	www.siu.edu /~pbgc/classes/crcpress.doc (10020 words)

	Cytokinin Inhibits a Subset of Diageotropica-Dependent Primary Auxin Responses in Tomato -- Coenen et al. 131 (4): 1692 ... (Site not responding. Last check: 2007-10-09)
		Influence of auxin, cytokinin, and the dgt mutation on the expression of the LeSAUR gene as determined by RNA gel blots.
		Influence of cytokinin on auxin-induced ethylene synthesis in wild-type and dgt tomato hypocotyl segments.
		pathway that is inhibited by cytokinin and one that is not.
	www.plantphysiol.org /cgi/content/full/131/4/1692 (6927 words)

	Senescence - cytokinin senescence mechanism cutflower
		Organismal aging is generally characterized by the declining ability to respond to stress, leaf senescence cytokinin increasing homeostatic imbalance and increased risk of disease.
		Because of this, death is the ultimate cytokinin senescence protein metabolism consequence of aging.
		The process of senescence is complex, and may derive cytokinin orchid senescence pdf from a variety of different mechanisms and exist for a variety of different reasons.
	www.medicalgeo.com /Med-Diseases-R---Se/Senescence.html (2371 words)

	Plant Physiology
		The importance of the tRNA derived cytokinins in overall growth and development is not clear, either.
		ratio of cytokinin and auxin are important in determining the fate of the callus:
		Application of cytokinin to a leaf will cause it to act as a sink and nutrients will be directed towards it.
	employees.csbsju.edu /SSAUPE/biol327/Lecture/cytokinin.htm (998 words)

	1995 Version of Paul Pruitt's Plant Hormone Theory
		Cytokinin is here defined as made by cells under the condition of root derived nutrient abundance.
		Cytokinin is made by cells (in the whole plant), faced with an abundance of root derived nutrients (Water and Minerals).
		Gibberellin is made in cells faced with a scarcity of shoot derived nutrients and causes the release of stores of shoot derived nutrients, as well as the shrinking or inhibition of (under the circumstances) unneeded root cells.
	www.pruittfamily.com /paul/plantsvii.htm (2862 words)

	cytokinin
		Cytokinins synthesized from the terpenoid isopentenyl pyrophosphate (IPP) and adenosine monophosphate (AMP).
		Cytokinin oxidase responsible for degradation of cytokinins but probably does not affect conjugates.
		Movement of cytokinins in xylem is passive process - usually the cytokinins are moved in inactive form.
	www.clas.ufl.edu /users/gbowes/bot3503/cytokinin.htm (555 words)

	Endogenous Cytokinin Levels and Growth Responses to Extended Photoperiods for Creeping Bentgrass under Heat Stress -- ... (Site not responding. Last check: 2007-10-09)
		Cytokinin in phloem and xylem saps of Sinapis alba during floral induction.
		Cytokinin effects on creeping bentgrass responses to heat stress: II.
		Cytokinin effects on creeping bentgrass responses to heat stress: I. Shoot and root growth.
	crop.scijournals.org /cgi/content/full/44/1/209 (3129 words)

	ABA prevents the second cytokinin-mediated event during the induction of shoot buds in the moss Funaria hygrometrica -- ...
		Dark-grown protonemata on filter papers were placed onto one of the two types of hormone-supplemented media; after various amounts of time, filters with the protonema were removed, washed with three 25-mL aliquots of liquid basal medium to reduce hormone carryover, and placed onto the other type of hormone-supplemented medium.
		of ABA on cytokinin or the cytokinin receptor, reproducing the
		1999 Phenylurea cytokinins assayed for induction of shoot buds in the moss Funaria hygrometrica.
	www.amjbot.org /cgi/content/full/87/10/1540 (3729 words)

	COLLEGE OF AGRICULTURE
		Cytokinin should respond to growth, development and cOlor, of grasses.
		cytokinin and the effect of cytokinin-like chemicals in turfgrass.
		The effect of cytokinin level in control the movement of redistribution of nutrients is not known.
	www.rootsinc.com /turftoc_files/21_2.htm (292 words)

	NimbleGen Systems, Inc. (Site not responding. Last check: 2007-10-09)
		Earlier studies of calli with a higher-than-normal cytokinin content indicate that overproduction of cytokinin by the culture tissues is a possible explanation for this acquired cytokinin independence.
		Increased levels of expression of the cytokinin receptor CRE1, as well as altered levels of expression of several other genes involved in cytokinin signaling, indicated that naturally acquired deregulation of cytokinin-signaling components could play a previously unrecognized role in habituation.
		Up-regulation of several cytokinin oxidases, downregulation of several known cytokinin-inducible genes, and a lack of regulation of the cytokinin synthases indicated that increases in hormone concentration may not be required for habituation.
	www.nimblegen.com /products/pubs/plant_physiology_pischke.html (252 words)

	Isolation of a cytokinin gene, ZOG1, encoding zeatin O-glucosyltransferase from Phaseolus lunatus -- Martin et al. 96 ... (Site not responding. Last check: 2007-10-09)
		Isolation of a cytokinin gene, ZOG1, encoding zeatin O-glucosyltransferase from Phaseolus lunatus -- Martin et al.
		Isolation of a cytokinin gene, ZOG1, encoding zeatin O-glucosyltransferase from Phaseolus lunatus
		Molecular and Biochemical Characterization of a Cytokinin Oxidase from Maize
	intl.pnas.org /cgi/content/abstract/96/1/284 (787 words)

	Cytokinin Effects on Ribulose-1,5-Bisphosphate Carboxylase/Oxygenase and Nitrogen Partitioning in Rice during Ripening ... (Site not responding. Last check: 2007-10-09)
		Gene expression in cytokinin- and light-mediated plastogenesis of Cucurbita cotyledon: Ribulose-1,5-bisphosphate carboxylase/oxygenase.
		Cytokinin is required to induce the nitrogen-dependent accumulation of mRNAs for phosphoenolpyruvate carboxylase and carbonic anhydrase in detached maize leaves.
		Nitrogen-dependent accumulation of cytokinins in root and the translocation to leaf: Implication of cytokinin species that induces gene expression of maize response regulator.
	crop.scijournals.org /cgi/content/full/44/6/2107 (5053 words)

	Joseph Kieber
		Cytokinins, N6-substituted adenine derivatives, have been implicated to play a role in almost all aspects of plant growth and development.
		We have found that growth of etiolated Arabidopsis seedlings in cytokinin results in an increase in ethylene biosynthesis, which results in seedlings that display a triple response phenotype.
		We took advantage of this ethylene-mediated triple response in the presence of cytokinin to isolate mutants defective in cytokinin signaling to ethylene biosynthesis.
	www.bio.unc.edu /faculty/kieber (789 words)

	The Diageotropica Gene Differentially Affects Auxin and Cytokinin Responses throughout Development in Tomato -- Coenen ... (Site not responding. Last check: 2007-10-09)
		and on auxin and cytokinin responses of tissues cultured in vitro.
		Whereas the induction of calli in both dgt and wild-type explants was dependent on the presence of auxin and cytokinin (Fig.
		role of auxins and cytokinins in the release of buds from dominance.
	www.plantphysiol.org /cgi/content/full/117/1/63 (4594 words)

	Isolation and Characterization of Arabidopsis Mutants Defective in the Induction of Ethylene Biosynthesis by Cytokinin ... (Site not responding. Last check: 2007-10-09)
		characterizing the induction of ethylene biosynthesis by cytokinins
		response in the presence of 0.5 µmol of the cytokinin
		Plant J., and A., 1996 Increased endogenous cytokinin in the Arabidopsis amp1 mutant corresponds with de-etiolation responses.
	www.genetics.org /cgi/content/full/149/1/417 (5212 words)

	EC 1.5.99.12 - Cytokinin dehydrogenase.
		Catalyzes the oxidation of cytokinins, a family of N(6)-substituted adenine derivatives that are plant hormones, where the substituent is a dimethylallyl or other prenyl group.
		Although this activity was previously thought to be catalyzed by a hydrogen-peroxide-forming oxidase, this enzyme does not require oxygen for activity and does not form hydrogen peroxide.
		X-ray structure of cytokinin oxidase/dehydrogenase (ckx) from arabidopsis thaliana at5g21482
	www.ebi.ac.uk /thornton-srv/databases/cgi-bin/enzymes/GetPage.pl?ec_number=1.5.99.12 (175 words)

	ISOLATION OF GENES INVOLVED IN CYTOKININ RESPONSES IN ARABIDOPSIS
		Mutations at the c kappa r1 locus confer cytokinin resistance, and mutants were selected with the aim of identifying components in the cytokinin signal transduction pathway.
		It was further demonstrated that the amount of ethylene generated by cytokinin was sufficient to account for most of the cytokinin effect.
		In other studies, it was found that both cytokinin and light affect many of the same developmental processes in Arabidopsis, such as inhibition of hypocotyl elongation, and stimulation of cotyledon opening and enlargement.
	www.nal.usda.gov /pgdic/pggrantinfo/1993/9162111.html (589 words)

	Cytokinin-Deficient Transgenic Arabidopsis Plants Show Multiple Developmental Alterations Indicating Opposite Functions ... (Site not responding. Last check: 2007-10-09)
		Cytokinins are hormones that regulate cell division and development.
		that exogenous cytokinin inhibits the elongation of wild-type
		It was hypothesized that STP1 is an elongation-promoting
	www.plantcell.org /cgi/content/full/15/11/2532 (8534 words)

	Cytokinin - Wikipedia, the free encyclopedia
		Zeatin is named after the genera of corn, "Zea" as it was first discovered in corn.
		Their effects were first discovered through the use of coconut milk in the 1940s.
		Released by all cells when they are experiencing conditions that would normally cause a shoot meristematic cell to produce CK Directly or indirectly induced by high levels of GA/BA edit] Effects
	en.wikipedia.org /wiki/Cytokinin (284 words)

	CYTOKININ-REGULATED MRNA STABILITY IN SOYBEAN CELLS (Site not responding. Last check: 2007-10-09)
		INVESTIGATOR: Crowell, D. The objectives of this project are: to characterize cytokinin-induced stabilization of the soybean Cim1 mRNA in vivo and in vitro, and to identify Cim1 sequences that are necessary for mRNA stabilization in response to cytokinin.
		The mechanism by which the plant growth factor cytokinin stimulates the accumulation of the soybean Cim1 mRNA was examined in Fiscal Year 1996.
		Previously, we demonstrated that cytokinin-induced accumulation of the Cim1 mRNA was caused, in least in part, by decreased degradation of the mRNA and that accumulation was dependent on protein dephosphorylation.
	www.nal.usda.gov /pgdic/pggrantinfo/1994/9167010.html (418 words)

	Diurnal variation of cytokinin, auxin and abscisic acid levels in tobacco leaves -- Nováková et al. 56 ... (Site not responding. Last check: 2007-10-09)
		Endogenous levels of total cytokinins, physiologically active cytokinins (trans-zeatin, isopentenyladenine, dihydrozeatin, and the corresponding ribosides) and cis-zeatin (riboside) in tobacco leaves during a 24 h period.
		The activity of cytokinin oxidase/dehydrogenase (CKX) and endogenous levels of cytokinins, which are the substrates of this enzyme (trans-zeatin, isopentenyladenine, and the corresponding ribosides), in tobacco leaves during a 24 h period.
		J, Vanková R. Cytokinin N-glucosylation inhibitors suppress deactivation of exogenous cytokinins in radish, but their effect on active endogenous cytokinins is counteracted by other regulatory mechanisms.
	jxb.oxfordjournals.org /cgi/content/full/56/421/2877 (3519 words)

	ARS \| Publication request: Effects of Pruning on Auxin and Cytokinin Levels and Subsequent Shoot Regrowth among ...
		Response variables were length, weight, number and length of lateral branches, and auxin and cytokinin concentrations in current year shoots.
		Auxin was measured by GC-MS and cytokinins were measured by LC-MS using stable isotopes as internal standards.
		The auxin to cytokinin concentration was generally greater in current year shoots of Pillar than of Standard trees but significant branch growth occurred in Pillar trees between 58 and 87 days after bud break.
	www.ars.usda.gov /research/publications/publications.htm?SEQ_NO_115=169542 (610 words)

	Cytokinin 2004 \| Participants & schedule (Site not responding. Last check: 2007-10-09)
		Alteration of cytokinin metabolism in the moss Physcomitrella patens
		Cytokinin perception by the CRE1-family histidine kinases in Arabidopsis
		The role of cytokinins in clubroot disease and induction of resistance by CKX gene expression
	www.angenetik.fu-berlin.de /cytokininmeeting/participants_print.html (410 words)

	A Preliminary Investigation of the Role of Auxin and Cytokinin in Sylleptic Branching of Three Hybrid Poplar Clones ... (Site not responding. Last check: 2007-10-09)
		effects of cytokinin in the parent shoot is the cause of the
		effects of cytokinin in the parent shoot is the cause of increased
		Sachs T, Thimann K. The role of auxins and cytokinins in the release of buds from dominance.
	aob.oxfordjournals.org /cgi/content/full/90/3/417 (2749 words)

	A Gain-of-Function Mutation in a Cytokinin Receptor Triggers Spontaneous Root Nodule Organogenesis -- Tirichine et al. ...
		A Gain-of-Function Mutation in a Cytokinin Receptor Triggers Spontaneous Root Nodule Organogenesis -- Tirichine et al.
		A Gain-of-Function Mutation in a Cytokinin Receptor Triggers Spontaneous Root Nodule Organogenesis
		A Cytokinin Perception Mutant Colonized by Rhizobium in the Absence of Nodule Organogenesis.
	www.sciencemag.org /cgi/content/abstract/1132397 (381 words)

	Activation of the Oryza sativa non-symbiotic haemoglobin-2 promoter by the cytokinin-regulated transcription factor, ... (Site not responding. Last check: 2007-10-09)
		Cytokinins are hormones that have been implicated in numerous
		Cytokinins are sensed by histidine protein kinase receptors
		(A) In the absence of cytokinin (BA), overexpression of the A.
	jxb.oxfordjournals.org /cgi/content/full/55/403/1721 (5364 words)

	IngentaConnect Search Results
		Increase in activity, glycosylation and expression of cytokinin oxidase/dehydrogenase during the senescence of barley leaf segments in the dark
		Role of auxins and cytokinins in the development of lateral roots in wheat plants with several roots removed
		Influence of cytokinins and novel cytokinin antagonists on the senescence of detached leaves of Arabidopsis thaliana
	www.ingentaconnect.com /search?database=1&title=cytokinin (736 words)

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