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Titolo:
Analysis of Arabidopsis glucose insensitive mutants, gin5 and gin6, reveals a central role of the plant hormone ABA in the regulation of plant vegetative development by sugar
Autore:
Arenas-Huertero, F; Arroyo, A; Zhou, L; Sheen, J; Leon, P;
Indirizzi:
Univ Nacl Autonoma Mexico, Inst Biotecnol, Dept Biol Mol Plantas, Cuernavaca 62271, Morelos, Mexico Univ Nacl Autonoma Mexico Cuernavaca Morelos Mexico 62271 Morelos, Mexico Harvard Univ, Sch Med, Dept Genet, Boston, MA 02114 USA Harvard Univ Boston MA USA 02114 ch Med, Dept Genet, Boston, MA 02114 USA Massachusetts Gen Hosp, Dept Mol Biol, Boston, MA 02114 USA Massachusetts Gen Hosp Boston MA USA 02114 Mol Biol, Boston, MA 02114 USA
Titolo Testata:
GENES & DEVELOPMENT
fascicolo: 16, volume: 14, anno: 2000,
pagine: 2085 - 2096
SICI:
0890-9369(20000815)14:16<2085:AOAGIM>2.0.ZU;2-G
Fonte:
ISI
Lingua:
ENG
Soggetto:
SIGNAL-TRANSDUCTION PATHWAYS; ABSCISIC-ACID; GENE-EXPRESSION; PROTEIN-PHOSPHORYLATION; BETA-AMYLASE; WD PROTEIN; THALIANA; SUCROSE; HEXOKINASE; STRESS;
Keywords:
glucose insensitive; Arabidopsis thaliana; glucose regulation; ABA; abi; hexokinase;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
57
Recensione:
Indirizzi per estratti:
Indirizzo: Leon, P Univ Nacl Autonoma Mexico, Inst Biotecnol, Dept Biol Mol Plantas, Cuernavaca 62271, Morelos, Mexico Univ Nacl Autonoma Mexico Cuernavaca Morelos Mexico 62271 Mexico
Citazione:
F. Arenas-Huertero et al., "Analysis of Arabidopsis glucose insensitive mutants, gin5 and gin6, reveals a central role of the plant hormone ABA in the regulation of plant vegetative development by sugar", GENE DEV, 14(16), 2000, pp. 2085-2096

Abstract

Sugars have signaling roles in a wide variety of developmental processes in plants. To elucidate the regulatory components that constitute the glucose signaling network governing plant growth and development, we have isolated and characterized two Arabidopsis glucose insensitive mutants, gin5 and gin6, based on a glucose-induced developmental arrest during early seedling morphogenesis. The T-DNA-tagged gin6 mutant abrogates the glucose-induced expression of a putative transcription factor, ABI4, previously shown to be involved in seed-specific abscisic acid (ABA) responses. Thus, ABI4 might be a regulator involved in both glucose- and seed-specific ABA signaling. The characterization of the gin5 mutant, on the other hand, reveals that glucose-specific accumulation of ABA is essential for hexokinase-mediated glucose responses. Consistent with this result, we show that three ABA-deficientmutants (aba1-1, aba2-1, and aba3-2) are also glucose insensitive. Exogenous ABA can restore normal glucose responses in gin5 and aba mutants but notin gin6 plants. Surprisingly, only abi4 and abi5-1 but not other ABA-insensitive signaling mutants (abi1-1, abi2-1, and abi3-1) exhibit glucose insensitivity, indicating the involvement of a distinct ABA signaling pathway inglucose responses. These results provide the first direct evidence to support a novel and central role of ABA in plant glucose responses mediated through glucose regulation of both ABA levels by GIN5 and ABA signaling by GIN6/ABI4.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 25/09/20 alle ore 12:05:10