About: Antioxidant enzymatic protection during tobacco leaf ageing is affected by cytokinin depletion

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
Description	Plant ageing is associated with increased levels of ROS. Level of cytokinins is controlled by their irreversible degradation catalysed by CKX. The control and transgenic AtCKX2 plants differed substantially in their phenotypes. When the lowest leaves in controls became yellow all leaves in AtCKX2 tobacco still remained green. Activities of antioxidant enzymes decreased with leaf age in both tobacco plants except for APX in the old leaves and GR in young leaves. Enhancement of GR activity at all leaf stages, an increase of SOD and a decline of catalase in young leaves, as well as an increase of APX in the oldest leaves were observed in AtCKX2 plant compared to control. Similar changes were detected after determination of isoenzymes on zymograms. It is evident that AtCKX2 plants had postponed onset of senescence despite the significantly lowered level of cytokinins. Enhanced antioxidant protection, especially in the oldest leaves, could subsidise this phenomenon. Plant ageing is associated with increased levels of ROS. Level of cytokinins is controlled by their irreversible degradation catalysed by CKX. The control and transgenic AtCKX2 plants differed substantially in their phenotypes. When the lowest leaves in controls became yellow all leaves in AtCKX2 tobacco still remained green. Activities of antioxidant enzymes decreased with leaf age in both tobacco plants except for APX in the old leaves and GR in young leaves. Enhancement of GR activity at all leaf stages, an increase of SOD and a decline of catalase in young leaves, as well as an increase of APX in the oldest leaves were observed in AtCKX2 plant compared to control. Similar changes were detected after determination of isoenzymes on zymograms. It is evident that AtCKX2 plants had postponed onset of senescence despite the significantly lowered level of cytokinins. Enhanced antioxidant protection, especially in the oldest leaves, could subsidise this phenomenon. (en)
Title	Antioxidant enzymatic protection during tobacco leaf ageing is affected by cytokinin depletion Antioxidant enzymatic protection during tobacco leaf ageing is affected by cytokinin depletion (en)
skos:prefLabel	Antioxidant enzymatic protection during tobacco leaf ageing is affected by cytokinin depletion Antioxidant enzymatic protection during tobacco leaf ageing is affected by cytokinin depletion (en)
skos:notation	RIV/61389030:_____/11:00365377!RIV12-AV0-61389030
http://linked.open...avai/predkladatel	Ústav experimentální botaniky AV ČR, v.v.i.
http://linked.open...avai/riv/aktivita	P Z
http://linked.open...avai/riv/aktivity	P(GA522/03/0312), P(IAA600380701), P(LC06034), Z(AV0Z50380511)
http://linked.open...iv/cisloPeriodika	1
http://linked.open...vai/riv/dodaniDat	2012
http://linked.open...aciTvurceVysledku	Haisel, Daniel Motyka, Václav Holík, Josef Mýtinová, Zuzana Dobrev, Petre Lubovská, Zuzana Trávníčková, Alena Wilhelmová, Naděžda
http://linked.open.../riv/druhVysledku	J - Článek v odborném periodiku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Ústav experimentální botaniky AV ČR, v. v. i.
http://linked.open...dnocenehoVysledku	186496
http://linked.open...ai/riv/idVysledku	RIV/61389030:_____/11:00365377
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	Ageing; Antioxidant enzymes; Cytokinins (en)
http://linked.open.../riv/klicoveSlovo	Antioxidant enzymes Cytokinins Ageing
http://linked.open...odStatuVydavatele	NL - Nizozemsko
http://linked.open...ontrolniKodProRIV	[B8DC21D9F8BA]
http://linked.open...i/riv/nazevZdroje	Plant Growth Regulation
http://linked.open...in/vavai/riv/obor	CE
http://linked.open...ichTvurcuVysledku	8 (xsd:int)
http://linked.open...cetTvurcuVysledku	8 (xsd:int)
http://linked.open...vavai/riv/projekt	The study of the role of free radicals in regulation of senescence in plants Alternative ways regulating intra- and extracellular concentrations and activities of isoprenoid cytokinins in plants Regulation of morphogenesis of plant cells and organs
http://linked.open...UplatneniVysledku	2011
http://linked.open...v/svazekPeriodika	65
http://linked.open...iv/tvurceVysledku	Dobrev, Petre Haisel, Daniel Holík, Josef Lubovská, Zuzana Motyka, Václav Mýtinová, Zuzana Trávníčková, Alena Wilhelmová, Naděžda
http://linked.open...ain/vavai/riv/wos	00294690000003
http://linked.open...n/vavai/riv/zamer	Mechanismy regulace růstu a vývoje rostlin na úrovni buněk, orgánů a celých organismů: fyziologické, genetické a molekulárně biologické základy
issn	0167-6903
number of pages	12 (xsd:int)
http://bibframe.org/vocab/doi	10.1007/s10725-011-9571-4
is http://linked.open...avai/riv/vysledek of	Antioxidant enzymatic protection during tobacco leaf ageing is affected by cytokinin depletion Antioxidant enzymatic protection during tobacco leaf ageing is affected by cytokinin depletion

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