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Titolo:
Role of wall peroxidases in oat growth inhibition by DIMBOA
Autore:
Gonzalez, LF; Rojas, MC;
Indirizzi:
Univ Chile, Fac Ciencias, Dept Quim, Santiago, Chile Univ Chile SantiagoChile ile, Fac Ciencias, Dept Quim, Santiago, Chile
Titolo Testata:
PHYTOCHEMISTRY
fascicolo: 6, volume: 50, anno: 1999,
pagine: 931 - 937
SICI:
0031-9422(199903)50:6<931:ROWPIO>2.0.ZU;2-I
Fonte:
ISI
Lingua:
ENG
Soggetto:
HORSERADISH-PEROXIDASE; HYDROGEN-PEROXIDE; CELL-WALLS; HYDROXAMIC ACIDS; OXIDATION; SUPEROXIDE; INVOLVEMENT; GRAMINEAE; PHENOLS; LIGNIN;
Keywords:
DIMBOA; hydroxamic acids; Avena sativa; gramineae; peroxidases; diferulic acid; lignin;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Life Sciences
Citazioni:
23
Recensione:
Indirizzi per estratti:
Indirizzo: Gonzalez, LF Univ Chile, Fac Ciencias, Dept Quim, Casilla 653, Santiago, Chile Univ Chile Casilla 653 Santiago Chile 653, Santiago, Chile
Citazione:
L.F. Gonzalez e M.C. Rojas, "Role of wall peroxidases in oat growth inhibition by DIMBOA", PHYTOCHEM, 50(6), 1999, pp. 931-937

Abstract

2,4-Dihydroxy-7-methoxy-1,4-benzoxazin-3-one (DIMBOA). an effective growth-inhibitor of oat coleoptiles, enhanced 1524 and 246 limes the rate of NADHoxidation by ionically and covalently bound oat cell wall peroxidases. a reaction that generates H2O2. This effect was similar to that of p-coumaric acid, while ferulic add was a poor activator of this reaction. Coniferyl alcohol did not activate NADH oxidation. DIMBOA was poorly utilized by ionic or covalent oat wall peroxidases in the presence of H2O2. With horseradish peroxidase, DIMBOA efficiently promoted compound III breakdown with a decomposition rate constant of 4.88 x 10(-2) s(-1). This effect was 14 times higher than that obtained with p-coumaric acid that rave a decomposition rate constant of. 0.35 x 10(-2) s(-1). The diferulate and lignin levels in the cell walls from oat coleoptiles increased by 56 and 30%, respectively. upon DIMBOA treatment. The effect of DIMBOA on oar wall peroxidases would thus contribute to its growth inhibitory effect by promoting H2O2 synthesis and phenol coupling at the cell wall level. (C) 1999 Elsevier Science Ltd. Aii rights reserved.

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Documento generato il 20/09/20 alle ore 20:03:32