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Titolo:
Impaired sucrose-induction mutants reveal the modulation of sugar-induced starch biosynthetic gene expression by abscisic acid signalling
Autore:
Rook, F; Corke, F; Card, R; Munz, G; Smith, C; Bevan, MW;
Indirizzi:
John Innes Ctr, Dept Mol Genet, Norwich NR4 7UH, Norfolk, England John Innes Ctr Norwich Norfolk England NR4 7UH NR4 7UH, Norfolk, England
Titolo Testata:
PLANT JOURNAL
fascicolo: 4, volume: 26, anno: 2001,
pagine: 421 - 433
SICI:
0960-7412(200105)26:4<421:ISMRTM>2.0.ZU;2-P
Fonte:
ISI
Lingua:
ENG
Soggetto:
ADP-GLUCOSE PYROPHOSPHORYLASE; ARABIDOPSIS-THALIANA; ADPGLUCOSE PYROPHOSPHORYLASE; INSENSITIVE MUTANTS; MOLECULAR-CLONING; PROTEIN-KINASES; INDUCIBLE GENE; HIGHER-PLANTS; BETA-AMYLASE; WD PROTEIN;
Keywords:
Arabidopsis; sugar signalling; starch; abscisic acid; isi; AGPase;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Life Sciences
Citazioni:
56
Recensione:
Indirizzi per estratti:
Indirizzo: Bevan, MW John Innes Ctr, Dept Mol Genet, Colney Lane, Norwich NR4 7UH, Norfolk, England John Innes Ctr Colney Lane Norwich Norfolk England NR4 7UH gland
Citazione:
F. Rook et al., "Impaired sucrose-induction mutants reveal the modulation of sugar-induced starch biosynthetic gene expression by abscisic acid signalling", PLANT J, 26(4), 2001, pp. 421-433

Abstract

Plants both produce and utilize carbohydrates and have developed mechanisms to regulate their sugar status and co-ordinate carbohydrate partitioning. High sugar levels result in a feedback inhibition of photosynthesis and aninduction of storage processes. We used a genetic approach to isolate components of the signalling pathway regulating the induction of starch biosynthesis. The regulatory sequences of the sugar inducible ADP-glucose pyrophosphorylase subunit ApL3 were fused to a negative selection marker. Of the four impaired sucrose induction (isi) mutants described here, two (isi1 and isi2) were specific to this screen. The other two mutants (isi3 and isi4) showed additional phenotypes associated with sugar-sensing screens that select for seedling establishment on high-sugar media. The isi3 and isi4 mutantswere found to be involved in the abscisic acid signalling pathway, isi3 isallelic to abscisic acid insensitive4 (abi4), a gene encoding an Apetala2-type transcription factor; isi4 was found to be allelic to glucose insensitive1 (gin1) previously reported to reveal cross-talk between ethylene and glucose signalling. Here we present an alternative interpretation of gin1 asan allele of the ABA-deficient mutant aba2. Expression analysis showed that ABA is unable to induce ApL3 gene expression by itself, but greatly enhances ApL3 induction by sugar. Our data suggest a major role for ABA in relation to sugar-signalling pathways, in that it enhances the ability of tissues to respond to subsequent sugar signals.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 07/08/20 alle ore 07:08:44