OsCOL4 is a constitutive flowering repressor upstream of Ehd1 and downstream of OsphyB

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 photoreceptors. In rice, Hd1, an ortholog of CO, acts as a flowering promoter, and phytochromes repress...

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Veröffentlicht in:The Plant journal : for cell and molecular biology 2010-07, Vol.63 (1), p.18-30
Hauptverfasser: Lee, Yang-Seok, Jeong, Dong-Hoon, Lee, Dong-Yeon, Yi, Jakyung, Ryu, Choong-Hwan, Kim, Song L, Jeong, Hee J, Choi, Sang C, Jin, Ping, Yang, Jungil, Cho, Lae-Hyeon, Choi, Heebak, An, Gynheung
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container_title The Plant journal : for cell and molecular biology
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creator Lee, Yang-Seok
Jeong, Dong-Hoon
Lee, Dong-Yeon
Yi, Jakyung
Ryu, Choong-Hwan
Kim, Song L
Jeong, Hee J
Choi, Sang C
Jin, Ping
Yang, Jungil
Cho, Lae-Hyeon
Choi, Heebak
An, Gynheung
description 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 photoreceptors. In rice, Hd1, an ortholog of CO, acts as a flowering promoter, and phytochromes repress Hd1 expression. Here, we investigated the functioning of OsCOL4, a member of the CONSTANS-like (COL) family in rice. 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. This finding indicates that OsCOL4 is a constitutive repressor functioning upstream of Ehd1. By comparison, levels of Hd1, OsID1, OsMADS50, OsMADS51, and OsMADS56 transcripts were not significantly changed in oscol4 or OsCOL4-D, suggesting that OsCOL4 functions independently from previously reported flowering pathways. 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. We also present evidence for two independent pathways through which OsPhyB controls flowering time. These pathways are: (i) night break-sensitive, which does not need OsCOL4; and (ii) night break-insensitive, in which OsCOL4 functions between OsphyB and Ehd1.
doi_str_mv 10.1111/j.1365-313X.2010.04226.x
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CONSTANS (CO) plays a central role in the photoperiod flowering pathway of Arabidopsis, and CO protein stability is modulated by photoreceptors. In rice, Hd1, an ortholog of CO, acts as a flowering promoter, and phytochromes repress Hd1 expression. Here, we investigated the functioning of OsCOL4, a member of the CONSTANS-like (COL) family in rice. 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. This finding indicates that OsCOL4 is a constitutive repressor functioning upstream of Ehd1. By comparison, levels of Hd1, OsID1, OsMADS50, OsMADS51, and OsMADS56 transcripts were not significantly changed in oscol4 or OsCOL4-D, suggesting that OsCOL4 functions independently from previously reported flowering pathways. 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CONSTANS (CO) plays a central role in the photoperiod flowering pathway of Arabidopsis, and CO protein stability is modulated by photoreceptors. In rice, Hd1, an ortholog of CO, acts as a flowering promoter, and phytochromes repress Hd1 expression. Here, we investigated the functioning of OsCOL4, a member of the CONSTANS-like (COL) family in rice. 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. This finding indicates that OsCOL4 is a constitutive repressor functioning upstream of Ehd1. By comparison, levels of Hd1, OsID1, OsMADS50, OsMADS51, and OsMADS56 transcripts were not significantly changed in oscol4 or OsCOL4-D, suggesting that OsCOL4 functions independently from previously reported flowering pathways. 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Psychology</topic><topic>Gene Expression Regulation, Plant</topic><topic>Membranes</topic><topic>Mutagenesis, Insertional</topic><topic>Mutation</topic><topic>Neurons</topic><topic>night break</topic><topic>Oryza - genetics</topic><topic>Oryza - metabolism</topic><topic>Photoperiod</topic><topic>phytochrome</topic><topic>Plant physiology and development</topic><topic>Plant Proteins - genetics</topic><topic>Plant Proteins - metabolism</topic><topic>Proteins</topic><topic>Repressor Proteins - genetics</topic><topic>Repressor Proteins - metabolism</topic><topic>Rice</topic><topic>RNA, Plant - genetics</topic><topic>Vegetative and sexual reproduction, floral biology, fructification</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Lee, Yang-Seok</creatorcontrib><creatorcontrib>Jeong, Dong-Hoon</creatorcontrib><creatorcontrib>Lee, Dong-Yeon</creatorcontrib><creatorcontrib>Yi, Jakyung</creatorcontrib><creatorcontrib>Ryu, Choong-Hwan</creatorcontrib><creatorcontrib>Kim, Song L</creatorcontrib><creatorcontrib>Jeong, Hee J</creatorcontrib><creatorcontrib>Choi, Sang C</creatorcontrib><creatorcontrib>Jin, Ping</creatorcontrib><creatorcontrib>Yang, Jungil</creatorcontrib><creatorcontrib>Cho, Lae-Hyeon</creatorcontrib><creatorcontrib>Choi, Heebak</creatorcontrib><creatorcontrib>An, Gynheung</creatorcontrib><collection>AGRIS</collection><collection>Pascal-Francis</collection><collection>Medline</collection><collection>MEDLINE</collection><collection>MEDLINE (Ovid)</collection><collection>MEDLINE</collection><collection>MEDLINE</collection><collection>PubMed</collection><collection>Biotechnology Research Abstracts</collection><collection>Calcium &amp; Calcified Tissue Abstracts</collection><collection>Chemoreception Abstracts</collection><collection>Nucleic Acids Abstracts</collection><collection>Technology Research Database</collection><collection>Engineering Research Database</collection><collection>Algology Mycology and Protozoology Abstracts (Microbiology C)</collection><collection>Biotechnology and BioEngineering Abstracts</collection><collection>Genetics Abstracts</collection><collection>MEDLINE - Academic</collection><jtitle>The Plant journal : for cell and molecular biology</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Lee, Yang-Seok</au><au>Jeong, Dong-Hoon</au><au>Lee, Dong-Yeon</au><au>Yi, Jakyung</au><au>Ryu, Choong-Hwan</au><au>Kim, Song L</au><au>Jeong, Hee J</au><au>Choi, Sang C</au><au>Jin, Ping</au><au>Yang, Jungil</au><au>Cho, Lae-Hyeon</au><au>Choi, Heebak</au><au>An, Gynheung</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>OsCOL4 is a constitutive flowering repressor upstream of Ehd1 and downstream of OsphyB</atitle><jtitle>The Plant journal : for cell and molecular biology</jtitle><addtitle>Plant J</addtitle><date>2010-07</date><risdate>2010</risdate><volume>63</volume><issue>1</issue><spage>18</spage><epage>30</epage><pages>18-30</pages><issn>0960-7412</issn><eissn>1365-313X</eissn><abstract>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 photoreceptors. In rice, Hd1, an ortholog of CO, acts as a flowering promoter, and phytochromes repress Hd1 expression. Here, we investigated the functioning of OsCOL4, a member of the CONSTANS-like (COL) family in rice. 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. This finding indicates that OsCOL4 is a constitutive repressor functioning upstream of Ehd1. By comparison, levels of Hd1, OsID1, OsMADS50, OsMADS51, and OsMADS56 transcripts were not significantly changed in oscol4 or OsCOL4-D, suggesting that OsCOL4 functions independently from previously reported flowering pathways. 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. We also present evidence for two independent pathways through which OsPhyB controls flowering time. These pathways are: (i) night break-sensitive, which does not need OsCOL4; and (ii) night break-insensitive, in which OsCOL4 functions between OsphyB and Ehd1.</abstract><cop>Oxford, UK</cop><pub>Oxford, UK : Blackwell Publishing Ltd</pub><pmid>20409004</pmid><doi>10.1111/j.1365-313X.2010.04226.x</doi><tpages>13</tpages><oa>free_for_read</oa></addata></record>
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subjects Biological and medical sciences
Biology and morphogenesis of the reproductive apparatus. Photoperiodism, vernalisation
constants (CO)
DNA, Bacterial - genetics
early heading date 1 (Ehd1)
flowering time
Flowers & plants
Flowers - growth & development
Fundamental and applied biological sciences. Psychology
Gene Expression Regulation, Plant
Membranes
Mutagenesis, Insertional
Mutation
Neurons
night break
Oryza - genetics
Oryza - metabolism
Photoperiod
phytochrome
Plant physiology and development
Plant Proteins - genetics
Plant Proteins - metabolism
Proteins
Repressor Proteins - genetics
Repressor Proteins - metabolism
Rice
RNA, Plant - genetics
Vegetative and sexual reproduction, floral biology, fructification
title OsCOL4 is a constitutive flowering repressor upstream of Ehd1 and downstream of OsphyB
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