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First published online September 24, 2003; 10.1105/tpc.014498

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The Plant Cell, Vol. 15, 2399-2407, October 2003, Copyright © 2003,
American Society of Plant Biologists

Functional Characterization of Phytochrome Interacting Factor 3 in Phytochrome-Mediated Light Signal Transduction

Jonghyun Kim1,a, Hankuil Yi1,b, Goh Choib, Byongchul Shinb, Pill-Soon Songb and Giltsu Choi2,a,b

a Department of Biological Sciences, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Korea
b Kumho Life and Environmental Science Laboratory, Buk-gu, Gwangju 500-712, Korea

2 To whom correspondence should be addressed. E-mail gchoi{at}kaist.ac.kr; fax 82-42-869-2610

Phytochromes regulate various light responses through their interactions with different signaling proteins, such as phytochrome interacting factor 3 (PIF3). However, the physiological functions of PIF3 in light signaling are not yet fully understood. To increase our understanding of these roles, we characterized a T-DNA insertional pif3 mutant and transgenic plants overexpressing the full-length PIF3. Transgenic overexpressing lines displayed longer hypocotyls and smaller cotyledons under red light and reduced cotyledon opening under both red and far-red light, whereas the pif3 mutant showed the opposite phenotypes. The accumulation of anthocyanin and chlorophyll further indicated complicated features of PIF3 function. The accumulation of anthocyanin was increased and the content of chlorophyll was decreased in the overexpression lines. Our data indicate that PIF3 plays complex roles depending on the type of light response and the light conditions.




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