Control of circadian rhythms and photoperiodic flowering by the Arabidopsis GIGANTEA gene - PubMed (original) (raw)
Control of circadian rhythms and photoperiodic flowering by the Arabidopsis GIGANTEA gene
D H Park et al. Science. 1999.
Abstract
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.
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