title: Jasmonate regulates juvenile-to-adult phase transition in rice.
abstract: Juvenile-to-adult phase transition is an important shift for the acquisition of adult vegetative characteristics and subsequent reproductive competence. We identified a recessive precocious (pre) mutant exhibiting a long leaf phenotype in rice. The long leaf phenotype is conspicuous in the second to the fourth leaves, which are juvenile and juvenile-to-adult transition leaves. We found that morphological and physiological traits, such as midrib formation, shoot meristem size, photosynthetic rate and plastochron, in juvenile and juvenile-to-adult transition stages of the pre mutant have precociously acquired adult characteristics. In agreement with these results, expression patterns of miR156 and miR172, which are microRNAs regulating phase change, support the accelerated juvenile-to-adult phase change in the pre mutant. The mutated gene encodes an allene oxide synthase (OsAOS1), which is a key enzyme for the biosynthesis of jasmonic acid (JA). The pre mutant showed a low level of JA and enhanced sensitivity to gibberellic acid, which promotes the phase change in some plant species. We also show that prolonged plastochron in the pre mutant is caused by accelerated PLASTOCHRON1 (PLA1) function. The present study reveals a substantial role of JA as a negative regulator of vegetative phase change.
authors: Department of Agricultural and Environmental Biology, Graduate School of Agricultural and Life Sciences, University of Tokyo, Tokyo 113-8657, Japan ahibarak@mail.ecc.u-tokyo.ac.jp.
authors: Ken-Ichiro
authors: 0000-0001-8578-7276
authors: K
authors: Hibara
authors: Department of Agricultural and Environmental Biology, Graduate School of Agricultural and Life Sciences, University of Tokyo, Tokyo 113-8657, Japan.
authors: Miyako
authors: M
authors: Isono
authors: Department of Agricultural and Environmental Biology, Graduate School of Agricultural and Life Sciences, University of Tokyo, Tokyo 113-8657, Japan.
authors: Manaki
authors: M
authors: Mimura
authors: Institute of Agrobiological Sciences, National Agriculture and Food Research Organization, Ibaraki 305-8602, Japan.
authors: Naoki
authors: N
authors: Sentoku
authors: RIKEN Center for Sustainable Resource Science, Yokohama 230-0045, Japan.
authors: Mikiko
authors: M
authors: Kojima
authors: RIKEN Center for Sustainable Resource Science, Yokohama 230-0045, Japan Graduate School of Bioagricultural Sciences, Nagoya University, Nagoya 464-8601, Japan.
authors: Hitoshi
authors: H
authors: Sakakibara
authors: Department of Agricultural and Environmental Biology, Graduate School of Agricultural and Life Sciences, University of Tokyo, Tokyo 113-8657, Japan.
authors: Yuka
authors: Y
authors: Kitomi
authors: Department of Agricultural and Environmental Biology, Graduate School of Agricultural and Life Sciences, University of Tokyo, Tokyo 113-8657, Japan.
authors: Takanori
authors: T
authors: Yoshikawa
authors: Department of Agricultural and Environmental Biology, Graduate School of Agricultural and Life Sciences, University of Tokyo, Tokyo 113-8657, Japan.
authors: Jun-Ichi
authors: J
authors: Itoh
authors: Department of Agricultural and Environmental Biology, Graduate School of Agricultural and Life Sciences, University of Tokyo, Tokyo 113-8657, Japan.
authors: Yasuo
authors: Y
authors: Nagato
mesh_terms: D003517:Cyclopentanes / Q000378:metabolism*; D018506:Gene Expression Regulation, Plant / Q000235:genetics / Q000502:physiology; D012275:Oryza / Q000235:genetics / Q000378:metabolism*; D054883:Oxylipins / Q000378:metabolism*; D010940:Plant Proteins / Q000235:genetics / Q000378:metabolism*
chemical_list: D003517:Cyclopentanes; D054883:Oxylipins; D010940:Plant Proteins; C011006:jasmonic acid
keywords: ALLENE OXIDE SYNTHASE; Jasmonic acid; Juvenile-to-adult phase transition; Plastochron; Rice; precocious