Number of the records: 1

Function of plant defense secondary metabolite in cytokinin degradation

SYSNO ASEP	0359310
Document Type	J - Journal Article
R&D Document Type	Journal Article
Subsidiary J	Ostatní články
Title	Function of plant defense secondary metabolite in cytokinin degradation
Author(s)	Frébortová, Jitka (UEB-Q)_{RID, ORCID}
Number of authors	1
Source Title	Plant Signaling & Behavior. - : Taylor & Francis - ISSN 1559-2316 Roč. 5, č. 5 (2010), s. 523-525
Number of pages	3 s.
Language	eng - English
Country	US - United States
Keywords	cytokinin dehydrogenace ; 2,4-dihydroxy-7-methoxy-1,4-benzoxazin-3-one ; phenoxyl radiál
Subject RIV	EF - Botanics
R&D Projects	GA522/05/0448 GA ČR - Czech Science Foundation (CSF)
	GA301/08/1649 GA ČR - Czech Science Foundation (CSF)
CEZ	AV0Z50380511 - UEB-Q (2005-2011)
Annotation	The flavoenzyme cytokinin dehydrogenace (CKX) catalyzes an irreversible deactivation of plant hormones cytokinins through oxidative cleavage of the cytokinin side chain to Šeld adenine or adenosine and an aldehyde. In the catalytic cycle of CKX, the cytokinin-reduced flavin cofactor is reoxidized by a suitable electron acceptor. We have recently demonstrated that the oxidation products of natural hydroxamic acid 2,4-dihydroxy-7-methoxy-1,4-benzoxazin-3-one (DIMBOA) function as effective electron acceptors of apoplastic CKX from maize. The stable oxidation product of DIMBOA reacting with peroxidase or laccase was identified as 4-nitrosoresorcinol 1-monomethyl ether (coniferron), which, however, is only a weak electron acceptor of CKX. Further analyses suggested formativ of transient free radicals that were estimated to reoxidize the cytokininreduced flavin cofactor of CKX with the rates comparable to those of flavin reduction.
Workplace	Institute of Experimental Botany
Contact	David Klier, knihovna@ueb.cas.cz, Tel.: 220 390 469
Year of Publishing	2011

Number of the records: 1