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Plant and Cell Physiology Advance Access originally published online on August 18, 2009
Plant and Cell Physiology 2009 50(10):1774-1785; doi:10.1093/pcp/pcp119
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© The Author 2009. Published by Oxford University Press on behalf of Japanese Society of Plant Physiologists. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org

Blue Light-Induced Phototropism of Inflorescence Stems and Petioles is Mediated by Phototropin Family Members phot1 and phot2

Takatoshi Kagawa1,2,3,5,*, Mitsuhiro Kimura1,6 and Masamitsu Wada2,4,7

1Graduate School of Life and Environmental Sciences, University of Tsukuba, Tsukuba, 305-8577 Japan
2Division of Biological Regulation and Photobiology, National Institute for Basic Biology, Okazaki, 444-8585 Japan
3SORST, Japan Science and Technology Corporation, 1–8, Honcho 4-chome, Kawaguchi-city, Saitama, 332-0012 Japan
4Department of Biological Sciences, Graduate School of Science, Tokyo Metropolitan University, Tokyo, 192-0397 Japan

*Corresponding author: E-mail, takagawa{at}affrc.go.jp; Fax, +81-29-838-7463.


  Abstract

Phototropin family photoreceptors, phot1 and phot2, in Arabidopsis thaliana control the blue light (BL)-mediated phototropic responses of the hypocotyl, chloroplast relocation movement and stomatal opening. Phototropic responses in dark-grown tissues have been well studied but those in de-etiolated green plants are not well understood. Here, we analyzed phototropic responses of inflorescence stems and petioles of wild-type and phototropin mutant plants of A. thaliana. Similar to the results obtained from dark-grown seedlings, inflorescence stems and petioles in wild-type and phot2 mutant plants showed phototropic bending towards low fluence BL, while in phot1 mutant plants, a high fluence rate of BL was required. phot1 phot2 double mutant plants did not show any phototropic responses even under very high fluence rates of BL. We further studied the photoreceptive sites for phototropic responses of stems and petioles by partial tissue irradiation. The whole part of the inflorescence stem is sensitive to BL and shows phototropism, but in the petiole only the irradiated abaxial side is sensitive. Similar to dark-grown etiolated seedlings, phot1 plays a major role in phototropic responses under weak light, but phot2 functions under high fluence rate conditions in green plants.

Keywords: Arabidopsis thaliana - Blue light - Leaf movement - Partial irradiation - Phototropin mutants - Photo-receptor

Abbreviations: BL, blue light; LED, light emitting diode; WT, wild type.

5Present address: National Institute of Agrobiological Sciences, Kannondai 2-1-1, Tsukuba, 305-8602 Japan

6Present address: Department of Cell and Systems Biology, University of Toronto, 25 Willcocks Street, Toronto, M5S 3B2, Canada

7Present address: Department of Biology, Faculty of Science, Kyushu University, Hakozaki 6-10-1, Fukuoka, 812-8581 Japan

(Received June 30, 2009; Accepted August 6, 2009)
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