Os09g0240200

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The transition of the apical meristem from vegetative to reproductive growth is a critical event in the life cycle of rice,the CONSTANS (CO) gene is a central regulator in the photoperiod pathway, which is one of the floral pathway, the rice COL-like gene,OsCO3, in the photoperiodic control of flowering time.OsCO3 specially represses flowering in rice under SD conditions.

Annotated Information

Function

The photoperiod is an important environmental stress that determines flowering time. The CONSTANS(CO) and Heading date 1 (Hd1) genes are known to be central integrators of the photoperiod pathway in Arabidopsis and rice, respectively. Although they are both members of the CONSTANS-LIKE (COL) family and have two B-boxes and a CCT domain, rice also possesses novel COL genes that are not found in Arabidopsis. Here, we demonstrate that a novel COL gene, OsCO3, containing a single B-box and a CCT domain, modulates photoperiodic flowering in rice. The circadian expression pattern of OsCO3 mRNA oscillated in a different phase from Hd1 and was similar to that of OsCO3 pre-mRNA, suggesting that the diurnal expression pattern of OsCO3 transcripts may be regulated at the transcriptional level. Overexpression of OsCO3 specifically caused late flowering under short day (SD) conditions relative to wild-type rice plants. The expression of Hd3a and FTL decreased in these transgenic plants,whereas the expression of Hd1, Early heading date 1(Ehd1), OsMADS51, and OsMADS50 did not significantly change. OsCO3 primarily controls flowering time under SD conditions by negatively regulating Hd3a and FTL expression, independent of the SD-promotion pathway.

Fig1.jpg
Fig2.jpg

Fig1.Cross talk between flowering-time pathways in Arabidopsis Fig2.The Arabidopsis long-day pathway and how it has been modified in rice

CONSTANS is a member of 16 CO-Like (COL) genes that have been identified by Arabidopsis genome analysis.This family has been divided into three subgroups on the basis of variations within the B-box region. The Wrst subgroup (CO and COL1 to COL5) has two B-box genes, the second (COL9 to COL15) has one CO-like B-box and one different zinc-Wnger domain, and the third group (COL6 to COL8 and COL16) has one B-box gene. Several CO mutations have been observed in these B-boxes, revealing that conservation of these regions is required for proper CO function. However, it appears that CO function may not be conserved in other COL proteins which contain B-boxes that are closely related to those of CO. The overexpression of COL1 and COL2 does not regulate flowering time.

Expression

CONSTANS (CO) encodes a zinc finger protein and promotes flowering under LD conditions.Overexpression of CO was sufficient to promote early flowering independent of photoperiod.FLOWERING LOCUS T (FT), which encodes a protein similar to phosphatidylethanolamine-binding protein, also promotes flowering under LD conditions,and is a direct target of CO.the regulation of transcription by the circadian clock and, possibly, of protein stability by light conditions result in differential CO activity, which in turn results in different levels of FT mRNA under SD and LD conditions. Thus, CO acts between the circadian clock and promotion of flowering by FT.

The rice orthologues of the two key regulators of flowering time,CO and FT,were recently shown to be important inthe photoperiodic control of flowering in rice.The rice Hd1(Se1)gene, which is an orthologue of the Arabidopsis CO gene, was required for the suppression of flowering under LD conditions and for the promotion of flowering under SD conditions.Furthermore,the rice Hd3a gene, an orthologue of the Arabidopsis FT gene, was shown to be an activator of flowering in rice.CO controls the flowering time by integrating signals from the circadian clock and light to regulate FT expression.

Fig4.jpg

Fig3.The circadian oscillations of spliced and unspliced OsCO3 mRNAs

Evolution

the overexpression of OsCO3 signiWcantly delayed flowering under SD conditions.OsCO3 overexpression did not affect flowering in rice, indicating that OsCO3 is involved in the regulation of flowering time in a day-length dependent manner. Thus, these results suggest that OsCO3 is a negative regulator in the photoperiodic control of flowering in rice. Given that overexpression of OsCO3 and Hd1, which belong to the same OsCOL family group,resulted in opposite effects on flowering time, an important question is how these two genes play opposite roles under SD conditions in rice. One possibility is that OsCO3 and Hd1 may form different complexes with their own HAPs, thereby inducing opposite effects on flowering time when they are overexpressed.

Knowledge Extension

Apart from its fundamental role in plant development, the trait of flowering time is of great importance to plant breeders and commercial growers as it plays a key role in plant adaptation to growing regions. Ultimately, knowledge of flowering-time genes and how they work should help with the selection of novel plant varieties with altered flowering times. Early-flowering varieties might allow multiple rounds of cropping in a single season, varieties with delayed flowering may increase yields in crops such as sugar beet, pasture grasses, or forestry where vegetative growth is desired, while ornamentals would be induced to flower on command on important dates of the year.

Labs working on this gene

  • Plant Signaling Network Research Center,School of Life Sciences and Biotechnology Korea University, Seoul 136-701, South Korea
  • Genomics Division,National Institute of Agricultural Biotechnology,Suwon 441-707, South Korea
  • National Institute of Agrobiological Resources, Tsukuba, Ibaraki 305-8602, Japan
  • Bio-oriented Technology Research Advancement Institution, Omiya, Saitama 331-8537, Japan
  • Institute of the Society for Techno-innovation of Agriculture, Forestry and Fisheries, Tsukuba, Ibaraki 305-0854, Japan
  • Department of Biology, Faculty of Science, Toyama University, Toyama, 930-8555, Japan
  • School of Biological Sciences, University of Auckland, Auckland,New Zealand
  • Department of Biochemistry, University of Otago, Dunedin,New Zealand

References

<references> [1]

Structured Information

Gene Name

Os09g0240200

Description

Zinc finger, CONSTANS-type domain containing protein

Version

NM_001069178.1 GI:115478095 GeneID:4346474

Length

16382 bp

Definition

Oryza sativa Japonica Group Os09g0240200, complete gene.

Source

Oryza sativa Japonica Group

 ORGANISM  Oryza sativa Japonica Group
           Eukaryota; Viridiplantae; Streptophyta; Embryophyta; Tracheophyta;
           Spermatophyta; Magnoliophyta; Liliopsida; Poales; Poaceae; BEP
           clade; Ehrhartoideae; Oryzeae; Oryza.
Chromosome

Chromosome 9

Location

Chromosome 9:3613793..3630174

Sequence Coding Region

3614118..3614501,3629527..3630150

Expression

GEO Profiles:Os09g0240200

Genome Context

<gbrowseImage1> name=NC_008402:3613793..3630174 source=RiceChromosome09 preset=GeneLocation </gbrowseImage1>

Gene Structure

<gbrowseImage2> name=NC_008402:3613793..3630174 source=RiceChromosome09 preset=GeneLocation </gbrowseImage2>

Coding Sequence

<cdnaseq>atgctgaagttggagccggagttccccggcctgccgcagcggtgcgactcgtgccggtcggcgccgtgcgcgttctattgcctcgccgattcggcggcgctctgtgccacgtgcgacgctgacgtgcactccgtcaacccgctggcacgccgccaccgccgcgtaccaatgggcgtggtggctgcccccggcgccgggggagccttcgtcgtccgccctgcaggcggtgtcaactcctcctggccaatccgagagggcaggaggtgcgactacgacgatgacgacgccgacgccgctggggaggaagacgaagaggcgacgtcgtggcttctgttcgacccgctcaaggactcctcggatcaggggctgccgccgttcggcgacgcgctggtggccgacttcctcaacctcggcgggggcgccggggagaaggaggacgcgtcgtcgagcaaggactgcagcagcagccacgggaagagcagcgagggcagccacgagttcgccgtgcccggcgagcccgtaccggagcgccagggcttcggggcggtgagtatggacattaccgactacgacgcctccaatttcaggcgcgggtacagctttggcgcatcgctcggccacagcgtttcgatgtcatcgctggagaacatgagcacggtcccagactgcggtgtgccagacatcaccacctcctacttgaggtcatccaagagcaccatcgacctcttcacggcagcagctggctcccctgtggcggcgcacagcataatgtcgccaccgcagttcatgggcgccattgacagggaggccagggtgcaccggtacagggagaagaggaagacgaggcggttcgagaagaccatcaggtacgcgtcgcggaaggcgtatgccgagacccggccgaggatcaagggacgcttcgccaagcgcagcgacaccgaccttgaggtcgaccagtacttctccaccaccgccgactccagctgcggcgtcgtgcccacgttctag</cdnaseq>

Protein Sequence

<aaseq>MLKLEPEFPGLPQRCDSCRSAPCAFYCLADSAALCATCDADVHS VNPLARRHRRVPMGVVAAPGAGGAFVVRPAGGVNSSWPIREGRRCDYDDDDADAAGEE DEEATSWLLFDPLKDSSDQGLPPFGDALVADFLNLGGGAGEKEDASSSKDCSSSHGKS SEGSHEFAVPGEPVPERQGFGAVSMDITDYDASNFRRGYSFGASLGHSVSMSSLENMS TVPDCGVPDITTSYLRSSKSTIDLFTAAAGSPVAAHSIMSPPQFMGAIDREARVHRYR EKRKTRRFEKTIRYASRKAYAETRPRIKGRFAKRSDTDLEVDQYFSTTADSSCGVVPT F</aaseq>

Gene Sequence

<dnaseqindica>15674..16057#25..648#acgtcttcgcacaggcacccagccatgctgaagttggagccggagttccccggcctgccgcagcggtgcgactcgtgccggtcggcgccgtgcgcgttctattgcctcgccgattcggcggcgctctgtgccacgtgcgacgctgacgtgcactccgtcaacccgctggcacgccgccaccgccgcgtaccaatgggcgtggtggctgcccccggcgccgggggagccttcgtcgtccgccctgcaggcggtgtcaactcctcctggccaatccgagagggcaggaggtgcgactacgacgatgacgacgccgacgccgctggggaggaagacgaagaggcgacgtcgtggcttctgttcgacccgctcaaggactcctcggatcaggggctgccgccgttcggcgacgcgctggtggccgacttcctcaacctcggcgggggcgccggggagaaggaggacgcgtcgtcgagcaaggactgcagcagcagccacgggaagagcagcgagggcagccacgagttcgccgtgcccggcgagcccgtaccggagcgccagggcttcggggcggtgagtatggacattaccgactacgacgcctccaatttcaggcgcgggtacagctttggcgcatcgctcggccacagcgtaagtcttaatgttttttcttacaatcttacacgaattttcatcaatgaattatctacactagtaacttacccgtgctaactatacgataacattaaaccaaagactatcatatgttaacacaatcaaaaatataattagataaatttaaaactcacgtaaagattgaacaatagagagttgttatattttaaagacaaccatgtgcgcaaaatagcatggtaacctttatatcttcactcaaaaccatctattttttgatgcactgagaaattcttataagtaaataaatactatttgctcatgatatgcaaaataactacaagcaactcttattgaaaatttttccatgataattcactgacatattggtcatggatccacatgtcaatgagagaatggaggtcaactttcggagtcaaataaagattttatcccacaatttttggataattaaattatcaaaattacattatcattcataaataaaatgagttgggtaaaaggaaacgagaataccgaacacccatccatccaggtgtgacttcaagagttcaagaccaagaccaacagaaaaatgcattctcaagctcaaaccaaaaagataaagagaaacatagcactactagaaaaataatttttcatagcgttaccctattatttttctggcggttatacgcgaaaaccgcccacaaaaacgtaacaaggggtggggggctacagaccgccagcgaaaatagatttttgtcggcggccgagttaaaatccaccgtccacctattagaatccgctgccgcgaaaaatccacctattccacgcgcttctccaactctctcccttctctctccgcctatctacccaccgttctccctcctttctctgcctctccatccagccgccagcgacgacgaagctcgtggcgcgcgcatcggtcgacgggcggagcactggcggcttggttgacgggcggagcaccggcgactcgcggggcggcggatccggcggaggcgactcgcggggcggcggatccggcggcgacgactcacggggcggtggatccggcggaggcgactcgcggggcggcagatccaacggcggcgactcgcgggggggcgtcgcccagcggcggcgactcgcggggcggcgcggtgcggcgagtccggcgacggtgacaaggagaaggggcgactcgtggggcggcgtcgcccgacgaatccaacggcggcgactagctttgcgaggcggcaggtctgattcgcaccggtggatggcagctcggcgacgaggtgcagtggctgggctctacggcagtgacccacctcctcgtcgaccttgggcctccctgtcgccggcgatggaggatgggcacgccggtgattttgattttttttttcaaaatctggattccaattttcttcttttttaatcaaaaaatattttcactggcgggtgttttatcttccgacagcgaaaaccgaaatttgtgctagcggttgtcttagccagccgccagtgaagacaattttcgctggcggttgtgttaagccggccgccagcaaaaatcgatcttctctaacggtttgtcgctgctagcgtagatgctacatcttaactagcctttactttgtggcggctccgatatccgccagcaaaaacctaaaatggccgccacgaaagattgttttcgtagtagggtagaatacaatctaatgatccatcgcctgctaggctataagttatctattcgcctcttcacttctctttcagcaagcatacttatatggtgaagaaatgagacggtggagttatagattcagcaggaaaaaaaggattcaagagacaaccatactcataatttccataataggaggctcttgttttagccacgacgtacatcatactctgcttcgtcttcactccactttcacgatcctcaccgggctatttgttcatccaccacagcagagcatacctttgatctttcagttttgaaaaataatgttattcatgcatataagtagtaagtggatgattatggatgcttacactggaaatttgaaggactgggtgcttgccgtggtatatctgactggatgtagatgttgccaatatgaccggaggtccacacttgattgcccatgatgatacctaagagagcacggcggactgatcaaatgatcattacctgacatgaaagaaattatctgcacttaagaggaggcacaattcacactgactgattaaagttgttaatcagaggagttgtgttccaaattagaatgattctggtactaacagacgttacaaaattttgcaactctctctgatatcatgttaggactctgtctcaggtcaaaaacaattatgctactcacagattttgtacaaaatttagccctgacttagagttaatactccaattgtgccaaattaaactctaaatcaaattatcattacctaaaaagaaagaaattatttgcataaagaggagacataattcaaacctaactgatcaaagtttccaaccagaggagagtgcttgaatttaaaacaatgccagtactaactcagtgatcatgctctaaaccagaggtctctgtttcaaatcagaacaattctgttactcacagattttgtacaaaaatttagccctaaccaggaagtcccatagcaaacaggagaggttcgctgctttccttggaagtgccatagcaaacctgttacatttatatattctgaattcctcaaaggaattttgaaagcaagctgccagcatgctcaatattaaaaaattcaggttactttaaatgcttatctttatacaattcaaacttttataaaacatagaaaactcccagtttccattgtacaattcaaaaactattaaccatttagtaataaattcacttaaccactcatataagaagcaaagtcaagggacaataacaatgtatatttcagtgttctaaatttcagacggcccaatgcatattaaaaacaactatgccatttttctatttccatttcagcacagaaatatatacttaatataggagtacatagtagaaatacatagatatacatagttagatatggcaggtaccaatcaacaatcatccgataaacatgtagaaatgcactcctaactgcattgtggatgctgctggggaagtcaaccaagcatcaactatggacctttgtaagttcttccgaacaaaagatgcttcgtctgtacgaccataaccgtcaaacacctgtaaaatacccctaaaaatttgaaaccattaaccatctgctgtgaaaactcgtactgaacaaaaaaaaatgatgaacttaacatctcacatatgaatgttacttcagaaatttactgctggtgatgttgggtcccggtttgagcaaagtaatttattcccaaatgttcagtgttataattttattgcctagtttcaagtgctctaaactcacagattgtttacatgcatcaacagaatttgagttggaaattgtcagtgttgaacaaaaaaaaaactaaccttttgattgactggaaatgaaactcttgtgagtctcaatttccctcaatttattgcttctgattaactggaaactgaactctagtgagtgttaaattcccttaattgattgtaccactcaggaagactatctgcctacgtgcagtttgattcccaaatatgttcagaaccatacaaagacctaacccatcaatcctgccaagtctttccaatttcccacaagccctgtattgcatctgcacgccatctcatctaatctcacatcctctcacaaaataacagcaaaatagtccgggcaacagctgctgctgcggctgcttttgttgtgggcactaaaaacaaattggttattttcaagtctaagccattgagggagttgttttggttggtttgctcggtatttcacatgcactattttcgcaaatttgcatttgaactgtaatggttgaaggaacgggatcgagcgatgcttaccttgtccccagcgtggtcgagaggattccggtggtggcttaacagagagcacatggcgcaggatccttggcggcgcgagggagtcggcggtggcgtcgcgacgcagtcggcaagaggggatgccggcggcgtcgatttggaggcgtgtgagggggtgccaacagcgtcaaactggaggcgggaattgatggcgacgcgatgccgggcgtcggcgtcgtcgcacgcgaaggaggggcgtcggaatctatggcgcccggcggctgctgtgatgcggttggtgttgggatacgcgtaggctacgatagca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ttttttactagaagagatttgtattgtgtttcaaaaacatgaccggttaaaatatcaccgaagatttgcgtcgatttaaattatataatattttatcaatttatccctataaaacatgaaacttcttccttgactacataaacaactaattaactgcgtaaataagtcatggatatctctaaaggtagctagagaagaaaggaaatgtgatctttgattttttttctctctctccgatacagattgaatcaatcgctaaattaacagggtagccatgatttacgttttcatttactcatctcctatcatgttacaataattttattccgtacctgacccctccgttgatccacctttaagtacctctaagtacctcgcaaacaccgtaaaagatctctaggaattattgtgtagagtattttaaatcacatacaagtgtgtcacatcatcacgtactaggaattattttatagagtatcttaaatttcatgtaaacatgatatatcatttataattttgttgtatttttagaatttaatatgcgagcaatgtgaaattatcatctccatatcattatcacattatttaaacatatatatctatcttttatattatataaaatatgcattcatccacatatcctcagcaaaacgcggaatatcaaaactagtatagtatgcatttcaaccttgttcgacgatcgctcaggtttcgatgtcatcgctggagaacatgagcacggtcccagactgcggtgtgccagacatcaccacctcctacttgaggtcatccaagagcaccatcgacctcttcacggcagcagctggctcccctgtggcggcgcacagcataatgtcgccaccgcagttcatgggcgccattgacagggaggccagggtgcaccggtacagggagaagaggaagacgaggcggttcgagaagaccatcaggtacgcgtcgcggaaggcgtatgccgagacccggccgaggatcaagggacgcttcgccaagcgcagcgacaccgaccttgaggtcgaccagtacttctccaccaccgccgactccagctgcggcgtcgtgcccacgttctagcgagcagcttggccgcacgcctggaagacaatcaaagaagctcaggaatgaatatattctcccactgtatagtacatcttggttgcttagctatatatatatatatatatatatatatatatgtataattcgccgaatcgcctctaaatttgtgggaggtatgaggcttcagctgtaggtatatatagatgctagaaagatgctccttgtaaaattgtgcaggagtaaatgtaatcatgtagtcatccctccttctccaatcctttacaatacatttctgtttttttattcagcttaaaaactacgttttgttttttctcccgat</dnaseqindica>

External Link(s)

NCBI Gene:Os09g0240200, RefSeq:Os09g0240200

  1. Oikawa, T. and J. Kyozuka (2009). "Two-Step Regulation of LAX PANICLE1 Protein Accumulation in Axillary Meristem Formation in Rice." Plant Cell 21(4): 1095-1108.