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

SYSNO ASEP	0365377
Document Type	J - Journal Article
R&D Document Type	Journal Article
Subsidiary J	Článek ve WOS
Title	Antioxidant enzymatic protection during tobacco leaf ageing is affected by cytokinin depletion
Author(s)	Mýtinová, Zuzana (UEB-Q) Motyka, Václav (UEB-Q)_{RID, ORCID} Haisel, Daniel (UEB-Q)_{RID, ORCID} Lubovská, Zuzana (UEB-Q) Trávníčková, Alena (UEB-Q)_ORCID Dobrev, Petre (UEB-Q)_{RID, ORCID} Holík, Josef (UEB-Q)_{RID, ORCID} Wilhelmová, Naděžda (UEB-Q)_{RID, ORCID}
Source Title	Plant Growth Regulation. - : Springer - ISSN 0167-6903 Roč. 65, č. 1 (2011), s. 23-34
Number of pages	12 s.
Language	eng - English
Country	NL - Netherlands
Keywords	Ageing ; Antioxidant enzymes ; Cytokinins
Subject RIV	CE - Biochemistry
R&D Projects	GA522/03/0312 GA ČR - Czech Science Foundation (CSF)
	IAA600380701 GA AV ČR - Academy of Sciences of the Czech Republic (AV ČR)
	LC06034 GA MŠMT - Ministry of Education, Youth and Sports (MEYS)
CEZ	AV0Z50380511 - UEB-Q (2005-2011)
UT WOS	000294690000003
DOI	10.1007/s10725-011-9571-4
Annotation	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.
Workplace	Institute of Experimental Botany
Contact	David Klier, knihovna@ueb.cas.cz, Tel.: 220 390 469
Year of Publishing	2012

Number of the records: 1