Hokkaido University Collection of Scholarly and Academic Papers >
Graduate School of Science / Faculty of Science >
Peer-reviewed Journal Articles, etc >
Phytochrome-mediated growth inhibition of seminal roots in rice seedlings
Title: | Phytochrome-mediated growth inhibition of seminal roots in rice seedlings |
Authors: | Shimizu, Hisayo Browse this author | Tanabata, Takanari Browse this author | Xie, Xianzhi Browse this author | Inagaki, Noritoshi Browse this author | Takano, Makoto Browse this author | Shinomura, Tomoko Browse this author | Yamamoto, Kotaro T. Browse this author |
Issue Date: | Nov-2009 |
Publisher: | Blackwell Publishing |
Journal Title: | Physiologia Plantarum |
Volume: | 137 |
Issue: | 3 |
Start Page: | 289 |
End Page: | 297 |
Publisher DOI: | 10.1111/j.1399-3054.2009.01277.x |
Abstract: | In rice (Oryza sativa) seedlings, continuous white-light irradiation inhibited the growth of seminal roots but promoted the growth of crown roots. Here, we examined the mechanisms of photoinhibition of seminal root growth. Photoinhibition occurred in the absence of nitrogen, but increased with increasing nitrogen concentrations. In the presence of nitrogen, photoinhibition was correlated with coiling of the root tips. The seminal roots were most photosensitive 48-72 h after germination during the 7-d period after germination. White-light irradiation for at least 6 h was required for photoinhibition, and the Bunsen-Roscoe law of reciprocity was not observed. Experiments with phytochrome mutants showed that far-red light was perceived exclusively by phyA, that red light was perceived by both phyA and phyB, and phyC had little or no role in growth inhibition or coiling of the seminal roots. Fluence-response curve analyses also showed that phyA and phyB control very low fluence response and low fluence response, respectively, in the seminal roots. This was essentially the same as the growth inhibition previously observed at the late stage of coleoptile development (80 h after germination). These results also suggest that other blue-light photoreceptors are involved in growth inhibition of the seminal roots. The photoperceptive site for the root growth inhibition appeared to be the roots themselves. All three phytochrome species of rice were detected immunochemically in roots. |
Rights: | The definitive version is available at www.blackwell-synergy.com |
Type: | article (author version) |
URI: | http://hdl.handle.net/2115/44104 |
Appears in Collections: | 理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
|
Submitter: 山本 興太朗
|