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Plant and Cell Physiology, 2003, Vol. 44, No. 6 565-572
© 2003 Oxford University Press

FIN5 Positively Regulates Far-red Light Responses in Arabidopsis thaliana

Dae-Shik Cho, Sung-Hyun Hong, Hong-Gil Nam and Moon-Soo Soh1,2

Department of Life Science and School of Environmental Engineering, Pohang University of Science and Technology, San 31, Hyoja-Dong, Nam-Gu, Pohang, Kyungbuk, 790–784 Republic of Korea

We report the characterization of a semi-dominant mutation fin5-1 (far-red insensitive 5–1) of Arabidopsis, which was isolated from genetic screening of phytochrome A (phyA) signaling components. Plants with the fin5-1 mutation exhibited a long hypocotyl phenotype when grown under far-red (FR) light, but not under red light. Physiological analyses implied that FIN5 might be differentially involved in diverse responses that are regulated by phyA under continuous FR light. Anthocyanin accumulation, gravitropic response of hypocotyl growth, and FR light-preconditioned blocking of greening were also impaired in the fin5-1 mutant, whereas photoperiodic floral induction was not, if at all, significantly affected. Moreover, light-regulated expression of the CHS, PORA and PsbS genes was attenuated in fin5-1 mutant plants, while the light-induced expression of CAB was normal. The mutation exhibited semi-dominance regarding control of hypocotyl growth in FR light. We suggest that FIN5 defines a novel branch in the network of phyA signaling in Arabidopsis.

1 Present address: Kumho Life and Environmental Science Laboratory, 1, Oryong-Dong, Buk-Gu, Gwangju, 500-480 Republic of Korea.

2 Corresponding author: E-mail, mssoh{at}kkpc.com; Fax, +82-62-972-5085.


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