Control of circadian rhythms and photoperiodic flowering by the Arabidopsis GIGANTEA gene.
Photoperiodic responses in plants include flowering that is day-length-dependent. Mutations in the Arabidopsis thaliana GIGANTEA (GI) gene cause photoperiod-insensitive flowering and alteration of circadian rhythms. The GI gene encodes a protein containing six putative transmembrane domains. Circadian expression patterns of the GI gene and the clock-associated genes, LHY and CCA1, are altered in gi mutants, showing that GI is required for maintaining circadian amplitude and appropriate period length of these genes. The gi-1 mutation also affects light signaling to the clock, which suggests that GI participates in a feedback loop of the plant circadian system.
Park
D H
DH
Department of Life Science, Pohang University of Science and Technology, Pohang, Kyungbuk, 790-784, Korea.
Somers
D E
DE
Kim
Y S
YS
Choy
Y H
YH
Lim
H K
HK
Soh
M S
MS
Kim
H J
HJ
Kay
S A
SA
Nam
H G
HG
D017360:Arabidopsis / Q000235:genetics* / Q000502:physiology*; D029681:Arabidopsis Proteins; D002940:Circadian Rhythm; D003001:Cloning, Molecular; D003433:Crosses, Genetic; D004268:DNA-Binding Proteins / Q000235:genetics; D003624:Darkness; D005246:Feedback; D018506:Gene Expression Regulation, Plant; D017343:Genes, Plant; D008027:Light; D008969:Molecular Sequence Data; D009154:Mutation; D017440:Photoperiod; D018515:Plant Leaves / Q000502:physiology; D010940:Plant Proteins / Q000737:chemistry / Q000235:genetics* / Q000502:physiology; D018514:Plant Structures / Q000502:physiology; D017384:Sequence Deletion; D014157:Transcription Factors / Q000235:genetics
D029681:Arabidopsis Proteins; C114425:CCA1 protein, Arabidopsis; D004268:DNA-Binding Proteins; C121183:GI protein, Arabidopsis; C113192:LHY protein, Arabidopsis; D010940:Plant Proteins; D014157:Transcription Factors