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 language | English |
|---|---|
| Pages (from-to) | 161-171 |
| Number of pages | 11 |
| Journal | Plant Journal |
| Volume | 34 |
| Issue number | 2 |
| DOIs | |
| Publication status | Published - 2003 Apr 1 |
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All Science Journal Classification (ASJC) codes
- Genetics
- Plant Science
- Cell Biology
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The Arabidopsis COG1 gene encodes a Dof domain transcription factor and negatively regulates phytochrome signaling. / Park, Don Ha; 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 journal › Article
TY - JOUR
T1 - The Arabidopsis COG1 gene encodes a Dof domain transcription factor and negatively regulates phytochrome signaling
AU - Park, Don Ha
AU - Lim, Pyung Ok
AU - Kim, Jeong Sik
AU - Cho, Dae Shik
AU - Hong, Sung Hyun
AU - Nam, Hong Gil
PY - 2003/4/1
Y1 - 2003/4/1
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=0037696359&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0037696359&partnerID=8YFLogxK
U2 - 10.1046/j.1365-313X.2003.01710.x
DO - 10.1046/j.1365-313X.2003.01710.x
M3 - Article
C2 - 12694592
AN - SCOPUS:0037696359
VL - 34
SP - 161
EP - 171
JO - Plant Journal
JF - Plant Journal
SN - 0960-7412
IS - 2
ER -