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Titolo:
Indole-3-acetic acid control on acidic oat cell wall peroxidases
Autore:
Gonzalez, LF; Perez, F; Rojas, MC;
Indirizzi:
Univ Chile, Fac Ciencias, Dept Quim, Santiago, Chile Univ Chile SantiagoChile ile, Fac Ciencias, Dept Quim, Santiago, Chile Univ Chile, Fac Ciencias, Dept Ciencias Ecol, Santiago, Chile Univ Chile Santiago Chile Ciencias, Dept Ciencias Ecol, Santiago, Chile
Titolo Testata:
JOURNAL OF PLANT GROWTH REGULATION
fascicolo: 1, volume: 18, anno: 1999,
pagine: 25 - 31
SICI:
0721-7595(199924)18:1<25:IACOAO>2.0.ZU;2-P
Fonte:
ISI
Lingua:
ENG
Soggetto:
HORSERADISH-PEROXIDASE; LIPID-PEROXIDATION; LUPIN PEROXIDASES; MAIZE COLEOPTILES; OXIDATION; GROWTH; LIGNIN; ISOPEROXIDASES; LIGNIFICATION; EXTENSIBILITY;
Keywords:
IAA; auxin; wall peroxidases; oat; Avena sativa; diferulic acid; lignin;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Life Sciences
Citazioni:
34
Recensione:
Indirizzi per estratti:
Indirizzo: Rojas, MC Univ Chile, Fac Ciencias, Dept Quim, Casilla 653, Santiago, Chile Univ Chile Casilla 653 Santiago Chile lla 653, Santiago, Chile
Citazione:
L.F. Gonzalez et al., "Indole-3-acetic acid control on acidic oat cell wall peroxidases", J PL GR REG, 18(1), 1999, pp. 25-31

Abstract

Incubation of oat coleoptile segments with 40 mu M indoleacetic acid (IAA)induced a decrease of 35-60% in peroxidase activity at the cell wall compartment. Treatment with IAA also produced a similar decrease in the oxidation of NADH and IAA at the cell wall. Isoelectric focusing of ionic, covalent, and intercellular wall peroxidase fractions showed that acidic isoforms (pI 4.0-5.5) were reduced preferentially by IAA treatment. Marked differences were found between acidic and basic wall isoperoxidases in relation to their efficacy in the oxidation of IAA. A peroxidase fraction containing acidic isoforms oxidized IAA with a V-max/s(0.5) value of 2.4 x 10(-2) min(-1) g fw(-1), 4.0 times higher than that obtained for basic peroxidase isoforms(0.6 x 10-2 min(-1) g fw(-1)). In contrast, basic isoforms were more efficient than acidic isoperoxidases in the oxidation of coniferyl alcohol or ferulic acid with H2O2 (5.6 and 2.1 times, respectively). The levels of diferulate and lignin in the walls of oat coleoptile segments were not altered by treatment with lAA. The decrease in cell wall peroxidase activity by IAA was related more to reduced oxidative degradation of the hormone than to covalent cell wall cross-linking.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 20/09/20 alle ore 20:13:39