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Title: The effects of phytochrome-mediated light signals on the developmental acquisition of photoperiod sensitivity in rice.
Authors: Yoshitake, Yoshihiro  kyouindb  KAKEN_id  orcid (unconfirmed)
Yokoo, Takayuki
Saito, Hiroki
Tsukiyama, Takuji
Quan, Xu
Zikihara, Kazunori
Katsura, Hitomi
Tokutomi, Satoru
Aboshi, Takako
Mori, Naoki  kyouindb  KAKEN_id  orcid (unconfirmed)
Inoue, Hiromo  kyouindb  KAKEN_id
Nishida, Hidetaka
Kohchi, Takayuki  kyouindb  KAKEN_id  orcid (unconfirmed)
Teraishi, Masayoshi  kyouindb  KAKEN_id  orcid (unconfirmed)
Okumoto, Yutaka  KAKEN_id
Tanisaka, Takatoshi
Author's alias: 齊藤, 大樹
奥本, 裕
Issue Date: 9-Jan-2015
Publisher: Springer Nature
Journal title: Scientific Reports
Volume: 5
Thesis number: 7709
Abstract: Plants commonly rely on photoperiodism to control flowering time. Rice development before floral initiation is divided into two successive phases: the basic vegetative growth phase (BVP, photoperiod-insensitive phase) and the photoperiod-sensitive phase (PSP). The mechanism responsible for the transition of rice plants into their photoperiod-sensitive state remains elusive. Here, we show that se13, a mutation detected in the extremely early flowering mutant X61 is a nonsense mutant gene of OsHY2, which encodes phytochromobilin (PΦB) synthase, as evidenced by spectrometric and photomorphogenic analyses. We demonstrated that some flowering time and circadian clock genes harbor different expression profiles in BVP as opposed to PSP, and that this phenomenon is chiefly caused by different phytochrome-mediated light signal requirements: in BVP, phytochrome-mediated light signals directly suppress Ehd2, while in PSP, phytochrome-mediated light signals activate Hd1 and Ghd7 expression through the circadian clock genes' expression. These findings indicate that light receptivity through the phytochromes is different between two distinct developmental phases corresponding to the BVP and PSP in the rice flowering process. Our results suggest that these differences might be involved in the acquisition of photoperiod sensitivity in rice.
Rights: This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International License. The images or other third party material in this article are included in the article's Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder in order to reproduce the material. To view a copy of this license, visit
DOI(Published Version): 10.1038/srep07709
PubMed ID: 25573482
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