title: Suppressor of rid1 (SID1) shares common targets with RID1 on florigen genes to initiate floral transition in rice.
abstract: The transition from vegetative to reproductive growth is a critical process in the life cycle of higher plants. Previously, we cloned Rice Indeterminate 1 (RID1), which acts as the master switch for the transition from the vegetative to reproductive phase in rice. Although the photoperiod pathway of RID1 inducing expression of the florigen genes Hd3a and RFT1 via Ehd1 has been established, the alternative pathways for the essential flowering transition need to be further examined. Here, we identified a Suppressor of rid1 (SID1), which rescues the never-flowering phenotype of rid1. SID1 encodes an INDETERMINATE DOMAIN (IDD) transcription factor. Mutation in SID1 showed the delayed flowering phenotype. Gain-of-function of SID1, OsIDD1, or OsIDD6 could restore the rid1 to flowering. Further analyses showed SID1 and RID1 directly target the promoter regions of Hd3a and RFT1, two florigen genes in rice. Taken together, our results reveal an autonomous flowering pathway might be mediated by RID1, thereby controlling the phase transition from vegetative to reproductive development in rice.
authors.affiliation: National Key Laboratory of Crop Genetic Improvement and National Center of Plant Gene Research (Wuhan), Huazhong Agricultural University, Wuhan, China.
authors.forename: Li
authors.identifier: 0000-0003-1638-1867
authors.initials: L
authors.lastname: Deng
authors.affiliation: National Key Laboratory of Crop Genetic Improvement and National Center of Plant Gene Research (Wuhan), Huazhong Agricultural University, Wuhan, China.
authors.forename: Lingmei
authors.identifier: 0000-0001-7048-7211
authors.initials: L
authors.lastname: Li
authors.affiliation: National Key Laboratory of Crop Genetic Improvement and National Center of Plant Gene Research (Wuhan), Huazhong Agricultural University, Wuhan, China.
authors.forename: Shuo
authors.identifier: 0000-0003-4814-7055
authors.initials: S
authors.lastname: Zhang
authors.affiliation: National Key Laboratory of Crop Genetic Improvement and National Center of Plant Gene Research (Wuhan), Huazhong Agricultural University, Wuhan, China.
authors.forename: Jianqiang
authors.initials: J
authors.lastname: Shen
authors.affiliation: National Key Laboratory of Crop Genetic Improvement and National Center of Plant Gene Research (Wuhan), Huazhong Agricultural University, Wuhan, China.
authors.forename: Shaobo
authors.identifier: 0000-0001-7238-6553
authors.initials: S
authors.lastname: Li
authors.affiliation: National Key Laboratory of Crop Genetic Improvement and National Center of Plant Gene Research (Wuhan), Huazhong Agricultural University, Wuhan, China.
authors.forename: Sifan
authors.identifier: 0000-0001-7155-9934
authors.initials: S
authors.lastname: Hu
authors.affiliation: National Key Laboratory of Crop Genetic Improvement and National Center of Plant Gene Research (Wuhan), Huazhong Agricultural University, Wuhan, China.
authors.forename: Qiang
authors.identifier: 0000-0003-3983-0004
authors.initials: Q
authors.lastname: Peng
authors.affiliation: National Key Laboratory of Crop Genetic Improvement and National Center of Plant Gene Research (Wuhan), Huazhong Agricultural University, Wuhan, China.
authors.forename: Jinghua
authors.initials: J
authors.lastname: Xiao
authors.affiliation: National Key Laboratory of Crop Genetic Improvement and National Center of Plant Gene Research (Wuhan), Huazhong Agricultural University, Wuhan, China.
authors.forename: Changyin
authors.initials: C
authors.lastname: Wu
mesh_terms: D001483:Base Sequence; D060405:Florigen / Q000378:metabolism*; D035264:Flowers / Q000235:genetics* / Q000378:metabolism / Q000528:radiation effects; D018506:Gene Expression Regulation, Plant; D009154:Mutation; D012275:Oryza / Q000235:genetics* / Q000378:metabolism / Q000528:radiation effects; D010641:Phenotype; D017440:Photoperiod; D010940:Plant Proteins / Q000235:genetics* / Q000378:metabolism; D011401:Promoter Regions, Genetic / Q000235:genetics; D011485:Protein Binding; D020133:Reverse Transcriptase Polymerase Chain Reaction; D015398:Signal Transduction / Q000235:genetics / Q000528:radiation effects; D013997:Time Factors; D014157:Transcription Factors / Q000235:genetics* / Q000378:metabolism
chemical_list: D060405:Florigen; D010940:Plant Proteins; D014157:Transcription Factors