Journal Article

<i>FIN5</i> Positively Regulates Far-red Light Responses in <i>Arabidopsis thaliana</i>

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

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 44, issue 6, pages 565-572
Published in print June 2003 | ISSN: 0032-0781
Published online June 2003 | e-ISSN: 1471-9053 | DOI:
FIN5 Positively Regulates Far-red Light Responses in Arabidopsis thaliana

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  • Biochemistry
  • Molecular and Cell Biology
  • Plant Sciences and Forestry


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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.

Keywords: Keywords: Arabidopsis thaliana — Far-red light — Phytochrome A — Signaling pathway.; Abbreviations: phy, phytochrome; FR, far-red; FRc, continuous far-red; R, red; Rc continuous red.

Journal Article.  6059 words.  Illustrated.

Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

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