title: The COP1 ortholog PPS regulates the juvenile-adult and vegetative-reproductive phase changes in rice.
abstract: Because plant reproductive development occurs only in adult plants, the juvenile-to-adult phase change is an indispensable part of the plant life cycle. We identified two allelic mutants, peter pan syndrome-1 (pps-1) and pps-2, that prolong the juvenile phase in rice (Oryza sativa) and showed that rice PPS is an ortholog of Arabidopsis thaliana CONSTITUTIVE PHOTOMORPHOGENIC1. The pps-1 mutant exhibits delayed expression of miR156 and miR172 and the suppression of GA biosynthetic genes, reducing the GA(3) content in this mutant. In spite of its prolonged juvenile phase, the pps-1 mutant flowers early, and this is associated with derepression of RAP1B expression in pps-1 plants independently of the Hd1-Hd3a/RFT1 photoperiodic pathway. PPS is strongly expressed in the fourth and fifth leaves, suggesting that it regulates the onset of the adult phase downstream of MORI1 and upstream of miR156 and miR172. Its ability to regulate the vegetative phase change and the time of flowering suggests that rice PPS acquired novel functions during the evolution of rice/monocots.
authors.affiliation: Graduate School of Agricultural and Life Sciences, University of Tokyo, Tokyo 113-8657, Japan.
authors.forename: Nobuhiro
authors.initials: N
authors.lastname: Tanaka
authors.forename: Hironori
authors.initials: H
authors.lastname: Itoh
authors.forename: Naoki
authors.initials: N
authors.lastname: Sentoku
authors.forename: Mikiko
authors.initials: M
authors.lastname: Kojima
authors.forename: Hitoshi
authors.initials: H
authors.lastname: Sakakibara
authors.forename: Takeshi
authors.initials: T
authors.lastname: Izawa
authors.forename: Jun-Ichi
authors.initials: J
authors.lastname: Itoh
authors.forename: Yasuo
authors.initials: Y
authors.lastname: Nagato
mesh_terms: D029681:Arabidopsis Proteins / Q000235:genetics / Q000378:metabolism*; D057906:Circadian Clocks / Q000235:genetics; D003624:Darkness; D020869:Gene Expression Profiling; D018507:Gene Expression Regulation, Developmental; D018506:Gene Expression Regulation, Plant; D005875:Gibberellins / Q000378:metabolism; D035683:MicroRNAs / Q000235:genetics / Q000378:metabolism; D009154:Mutation; D012275:Oryza / Q000033:anatomy & histology / Q000235:genetics / Q000254:growth & development* / Q000378:metabolism*; D010641:Phenotype; D017440:Photoperiod; D010937:Plant Growth Regulators / Q000378:metabolism; D010940:Plant Proteins / Q000235:genetics / Q000378:metabolism*; D012100:Reproduction, Asexual / Q000502:physiology*; D044767:Ubiquitin-Protein Ligases
chemical_list: D029681:Arabidopsis Proteins; D005875:Gibberellins; D035683:MicroRNAs; D010937:Plant Growth Regulators; D010940:Plant Proteins; C007842:gibberellic acid; C471983:AT2G32950 protein, Arabidopsis; D044767:Ubiquitin-Protein Ligases