Journal
BIOSCIENCE BIOTECHNOLOGY AND BIOCHEMISTRY
Volume 72, Issue 10, Pages 2770-2774Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1271/bbb.80321
Keywords
plant circadian clock; GIGANTEA; PSEUDO-RESPONSE REGULATOR
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Funding
- Grants-in-Aid for Scientific Research oil Priority Areas [20061016]
- Ministry of Education, Culture, Sports, Science, and Technology of Japan
- Grants-in-Aid for Scientific Research [20061016] Funding Source: KAKEN
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The GI (GIGANTEA) and PRR5 (PSEUDO-RESPONSE REGULATOR 5) genes are crucially implicated in the Arabidopsis circadian clock. We characterized a gi prr5 double loss-of-function mutant for the first time with reference to circadian clock-associated phenotypes. The results of this study revealed the genetic linkages between GI and PRR5 in the control of free running circadian oscillation of gene expression, early photomorphogenesis and flowering time. A mathematical clock model consisting of three interactive transcriptional feedback loops has recently been proposed. The model includes the hypothetical evening Y-TOC1 feedback loop, in which Y is suspected to be GI and/or PRR5. This issue was also addressed in this study; perhaps GI and PRR5 are not sufficient to fulfill the Y role.
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