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Journal of Experimental Botany, Vol. 55, No. 396, pp. 517-523, February 1, 2004
© 2004 Oxford University Press

Plants and the Environment

A transgene encoding a blue-light receptor, phot1, restores blue-light responses in the Arabidopsis phot1 phot2 double mutant

Received 22 July 2003; Accepted 15 October 2003

Michio Doi1, Ayako Shigenaga2, Takashi Emi2, Toshinori Kinoshita2 and Ken-ichiro Shimazaki2,*

1 Research and Development Center for Higher Education, Kyushu University, Ropponmatsu, Fukuoka 810-8560, Japan
2 Department of Biology, Faculty of Science, Kyushu University, Ropponmatsu, Fukuoka 810-8560, Japan

* To whom correspondence should be addressed. Fax: +81 92 726 4758. E-mail: kenrcb{at}mbox.nc.kyushu-u.ac.jp

Phototropins (phot1 and phot2) are suggested to be multifunctional blue-light (BL) receptors mediating phototropism, chloroplast movement, stomatal opening, and leaf expansion. The Arabidpsis phot1 phot2 double mutant lacks all of these responses. To confirm the requirement of phototropins in BL responses, the Arabidopsis phot1 phot2 double mutant was transformed with PHOT1 cDNA and the phenotypic restoration was analysed in the transformants. It was found that all BL responses were restored, although differentially, by the transformation of the Arabidopsis phot1 phot2 double mutant with PHOT1 cDNA. The results showed that phot1 was an essential component for all these BL responses in planta, and that the cellular level of phot1 might determine the individual BL responses.

Key words: Arabidopsis thaliana, blue-light response, chloroplast movement, guard cells, phototropin, phototropism, stomatal movement, transformation.


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