FIN5 positively regulates far-red light responses in Arabidopsis thaliana.
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.
Cho
Dae-Shik
DS
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.
Hong
Sung-Hyun
SH
Nam
Hong-Gil
HG
Soh
Moon-Soo
MS
D000217:Acyltransferases; D000221:Adaptation, Ocular; D000872:Anthocyanins / Q000378:metabolism / Q000528:radiation effects; D017360:Arabidopsis / Q000235:genetics / Q000254:growth & development* / Q000528:radiation effects*; D029681:Arabidopsis Proteins; D035264:Flowers / Q000254:growth & development / Q000528:radiation effects; D018506:Gene Expression Regulation, Plant / Q000235:genetics / Q000528:radiation effects; D018546:Hypocotyl / Q000254:growth & development / Q000528:radiation effects; D008027:Light; D045342:Light-Harvesting Protein Complexes; D009154:Mutation / Q000235:genetics* / Q000528:radiation effects*; D010775:Photic Stimulation; D045322:Photosynthetic Reaction Center Complex Proteins / Q000235:genetics / Q000378:metabolism / Q000528:radiation effects; D045332:Photosystem II Protein Complex; D010834:Phytochrome / Q000235:genetics* / Q000528:radiation effects*; D051942:Phytochrome A; D010940:Plant Proteins; D011506:Proteins / Q000378:metabolism / Q000528:radiation effects; D015398:Signal Transduction / Q000235:genetics / Q000528:radiation effects
D000872:Anthocyanins; D029681:Arabidopsis Proteins; D045342:Light-Harvesting Protein Complexes; C489731:NPQ4 protein, Arabidopsis; C497973:PHYA protein, Arabidopsis; D045322:Photosynthetic Reaction Center Complex Proteins; D045332:Photosystem II Protein Complex; D051942:Phytochrome A; D010940:Plant Proteins; D011506:Proteins; D010834:Phytochrome; D000217:Acyltransferases; C491135:AT5G13930 protein, Arabidopsis