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Phytochrome-mediated growth inhibition of seminal roots in rice seedlings

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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.
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Type: article (author version)
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

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