The Arabidopsis COG1 gene encodes a Dof domain transcription factor and negatively regulates phytochrome signaling

Donha Park, Pyung Ok Lim, Jeong Sik Kim, Dae Shik Cho, Sung Hyun Hong, Hong Gil Nam

Research output: Contribution to journalArticle

78 Citations (Scopus)

Abstract

Light is a critical environmental factor that influences almost all developmental aspects of plants, including seed germination, seedling morphogenesis, and transition to reproductive growth. Plants have therefore developed an intricate network of mechanisms to perceive and process environmental light information. To further characterize the molecular basis of light-signaling processes in plants, we screened an activation tagging pool of Arabidopsis for altered photoresponses. A dominant mutation, cog1-D, attenuated various red (R) and far-red (FR) light-dependent photoresponses. The mutation was caused by overexpression of a gene encoding a member of the Dof family of transcription factors. The photoresponses in Arabidopsis were inversely correlated with the expression levels of COG1 mRNA. When the COG1 gene was overexpressed in transgenic plants, the plants exhibited hyposensitive responses to R and FR light in a manner inversely dependent on COG1 mRNA levels. On the other hand, transgenic lines expressing antisense COG1 were hypersensitive to R and FR light. Expression of the COG1 gene is light inducible and requires phytochrome A (phyA) for FR light-induced expression and phytochrome B (phyB) for R light-induced expression. Thus, the COG1 gene functions as a negative regulator in both the phyA- and phyB-signaling pathways. We suggest that these phytochromes positively regulate the expression of COG1, a negative regulator, as a mechanism for fine tuning the light-signaling pathway.

Original languageEnglish
Pages (from-to)161-171
Number of pages11
JournalPlant Journal
Volume34
Issue number2
DOIs
Publication statusPublished - 2003 Apr 1

Fingerprint

Phytochrome
phytochrome
Arabidopsis
Transcription Factors
transcription factors
far-red light
Light
Genes
genes
Phytochrome B
Phytochrome A
mutation
gene overexpression
morphogenesis
transgenic plants
seed germination
Messenger RNA
Mutation
genetically modified organisms
Genetically Modified Plants

All Science Journal Classification (ASJC) codes

  • Genetics
  • Plant Science
  • Cell Biology

Cite this

Park, Donha ; Lim, Pyung Ok ; Kim, Jeong Sik ; Cho, Dae Shik ; Hong, Sung Hyun ; Nam, Hong Gil. / The Arabidopsis COG1 gene encodes a Dof domain transcription factor and negatively regulates phytochrome signaling. In: Plant Journal. 2003 ; Vol. 34, No. 2. pp. 161-171.
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The Arabidopsis COG1 gene encodes a Dof domain transcription factor and negatively regulates phytochrome signaling. / Park, Donha; Lim, Pyung Ok; Kim, Jeong Sik; Cho, Dae Shik; Hong, Sung Hyun; Nam, Hong Gil.

In: Plant Journal, Vol. 34, No. 2, 01.04.2003, p. 161-171.

Research output: Contribution to journalArticle

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