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Titolo:
Sucrose and light regulation of a cold-inducible UDP-glucose pyrophosphorylase gene via a hexokinase-independent and abscisic acid-insensitive pathway in Arabidopsis
Autore:
Ciereszko, I; Johansson, H; Kleczkowski, LA;
Indirizzi:
Umea Univ, Dept Plant Physiol, Umea Plant Sci Ctr, S-90187 Umea, Sweden Umea Univ Umea Sweden S-90187 , Umea Plant Sci Ctr, S-90187 Umea, Sweden Univ Bialystok, Inst Biol, PL-15950 Bialystok, Poland Univ Bialystok Bialystok Poland PL-15950 iol, PL-15950 Bialystok, Poland
Titolo Testata:
BIOCHEMICAL JOURNAL
, volume: 354, anno: 2001,
parte:, 1
pagine: 67 - 72
SICI:
0264-6021(20010215)354:<67:SALROA>2.0.ZU;2-B
Fonte:
ISI
Lingua:
ENG
Soggetto:
SIGNAL-TRANSDUCTION; HIGHER-PLANTS; TRANSCRIPT LEVELS; ENZYME-ACTIVITY; SINK-REGULATION; ANTISENSE RNA; SUGAR SENSOR; WATER-STRESS; EXPRESSION; THALIANA;
Keywords:
aba mutants; low-temperature stress; okadaic acid; sucrose signalling;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
40
Recensione:
Indirizzi per estratti:
Indirizzo: Kleczkowski, LA Umea Univ, Dept Plant Physiol, Umea Plant Sci Ctr, S-90187Umea, Sweden Umea Univ Umea Sweden S-90187 Ctr, S-90187 Umea, Sweden
Citazione:
I. Ciereszko et al., "Sucrose and light regulation of a cold-inducible UDP-glucose pyrophosphorylase gene via a hexokinase-independent and abscisic acid-insensitive pathway in Arabidopsis", BIOCHEM J, 354, 2001, pp. 67-72

Abstract

UDP-glucose pyrophosphorylase (UGPase) is a key enzyme producing UDP-glucose, which is involved in an array of metabolic pathways concerned with, among other functions, the synthesis of sucrose and cellulose. Arabidopsis thaliana UGPase-encoding gene, Ugp, was profoundly up-regulated by feeding sucrose to the excised leaves and by an exposure of plants to low temperature (5 degreesC). The UGPase activity and its protein content also increased under conditions of sucrose feeding and exposure to cold. The sucrose effect on Ugp was apparently specific and was mimicked by exposure of dark-adaptedleaves to light. Drought and O-2 deficiency had some down-regulating effects on expression of Ugp, The sugar-signalling pathway for USP regulation was independent of hexokinase, as was found by using transgenic plants with increased and decreased expression of the corresponding gene. Subjecting mutants deficient in abscisic acid (ABA) to cold stress conditions had no effect on Ugp expression profiles. Okadaic acid was a powerful inhibitor of Ugpexpression, whereas it up-regulated the gene encoding sucrose synthase (Sus1), indicating distinct transduction pathways in transmitting the sugar signal for the two genes in A. thaliana. We suggest that Ugp gene expression is mediated via a hexokinase-independent and ABA-insensitive pathway that involves an okadaic acid-responsive protein phosphatase. The data point towards Ugp as a possible regulatory entity that is closely involved in the homoeostatic readjustment of plant responses to environmental signals.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 28/03/20 alle ore 10:39:12