Os02g0610500
Plants recognize environmental factors to determine flowering time. CONSTANS (CO) plays a central role in the photoperiod flowering pathway of Arabidopsis, and CO protein stability is modulated by photoreceptor.
Contents
Annotated Information
Gene Symbol
- Os02g0610500 <=> OsBBX5, OsCCT06, OsCOL4, OsCOL4/OsD, OsD
function
Figure 1. Phenotypes of oscol4-1, oscol4-2, and WT at heading stage .(from reference)[1]).
- OsCOL4 is a member of the CONSTANS-like (COL) family in rice.
- OsCOL4 is a constitutive repressorfunctioning upstream of Ehd1 and functions independently from previously reported flowering pathways.
Phenotypic analysis
- In osphyB mutants, OsCOL4 expression was decreased and osphyB oscol4 double mutants flowered at the same time as the osphyB single mutants,indicating OsCOL4 functions downstream of OsphyB.[1]
Expression
- OsCOL4 null mutants flowered early under short or long days. In contrast, OsCOL4 activation-tagging mutants (OsCOL4-D) flowered late in either environment.
- Transcripts of Ehd1, Hd3a, and RFT1 were increased in the oscol4 mutants, but reduced in the OsCOL4-D mutants.
- By comparison, levels of Hd1, OsID1, OsMADS50, OsMADS51, and OsMADS56 transcripts were not significantly changed in oscol4 or OsCOL4-D.
- In osphyB mutants, OsCOL4 expression was decreased and osphyB oscol4 double mutants flowered at the same time as the osphyB single mutants[1]
Evolution
- Plants recognize environmental factors to determine flowering time. CONSTANS (CO) plays a central role in the photoperiod flowering pathway of Arabidopsis, and CO protein stability is modulated by photoreceptor[1]s.
- In the former, GIGANTEA (GI) activates CONSTANS (CO), which promotes Flowering Locus T (FT) expression[2]. The CO gene is a member of a B-box transcription factor family which contains a CCT (CO, CO-like, and TOC1) domain at the C-terminal end[3] .
- In rice, Hd1, an ortholog of CO, acts as a flowering promoter, and phytochromes repress Hd1 expression.The rice genome contains 16 OsCOL genes [4]. Among them, Hd1 was identified first via QTL analyses [5].
- Two groups of rice COL proteins differ from those in Arabidopsis [4].
Labs working on this gene
- Department of Life Science, Pohang University of Science and Technology (POSTECH), Pohang 790–784, Korea
- Crop Biotech Institute, Kyung Hee University, Yongin 446–701, Korea
- Department of Plant Systems Biotech, Kyung Hee University, Yongin 446–701, Korea
- Gyeongsang National University, Korea
- the Plant Functional Genomics Laboratory at the POSTECH
References
- ↑ 1.0 1.1 1.2 1.3 Yang-Seok Lee; Dong-Hoon Jeong; Dong-Yeon Lee;（2010）OsCOL4 is a constitutive flowering repressor upstream of Ehd1 and downstream of OsphyB The Plant Journal, 63(1): 18-30
- ↑ Yanovsky, M.J. and Kay, S.A. (2002) Molecular basis of seasonal time measurement in Arabidopsis. Nature, 419, 308–312
- ↑ Robson, F., Costa, M.M.R., Hepworth, S.R.. (2001) Functional importance of conserved domains in the flowering-time gene CONSTANS demonstrated by analysis of mutant alleles and transgenic plants. Plant J. 28, 619631
- ↑ 4.0 4.1 Griffiths, S., Dunford, R.P., Coupland, G. and Laurie, D.A. (2003) The evolution of CONSTANS-like gene families in barley, rice, and Arabidopsis. Plant Physiol. 131, 1855–1867
- ↑ Yano, M., Katayose, Y., Ashikari, M. et al. (2000) Hd1, a major photoperiod sensitivity quantitative trait locus in rice, is closely related to the Arabidopsis flowering time gene CONSTANS. Plant Cell, 12, 24732483
