Genetic identification of FIN2, a far red light-specific signaling component of Arabidopsis thaliana
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- Title
- Genetic identification of FIN2, a far red light-specific signaling component of Arabidopsis thaliana
- Authors
- Soh, MS; Hong, SH; Hanzawa, H; Furuya, M; Nam, HG
- Date Issued
- 1998-11
- Publisher
- BLACKWELL SCIENCE LTD
- Abstract
- Phytochrome A (PhyA) mediates most, if not all, various plant responses to far-red (FR) light. Here, we report a novel genetic mutation that impairs a variety of responses in the PhyA-signaling pathway of Arabidopsis thaliana. The mutation was isolated by screening seedlings that show reduced sensitivity to continuous far-red (FRc) light irradiation, but not to continuous red (Rc) light irradiation. The mutation named fin2-1 is not allelic to a PHYA mutation. Furthermore, immunoblot analysis indicated that the amount of the phytochrome A apoprotein in the fin2-1 mutant was comparable to that in wild type. Seedling of the fin2-1 mutant showed defects in hypocotyl growth inhibition and apical hook and cotyledon opening in FRc tight but not in Re light. The results showed that the mutation occurred in a downstream signaling component potentially specific to PhyA. Other PhyA-mediated responses such as FR-preconditioned blocking of greening, anthocyanin accumulation, reduction of gravitropic response, and expression of the CAB and CHS genes were impaired by the fin2-1 mutation: the degree of the mutant effect on the responses was variable. However, FR light-mediated seed germination and photoperiodic flowering responses were not affected significantly in the mutant. These results showed that FIN2 defines an upstream branch point in the PhyA signaling pathway.
- Keywords
- EXPRESSED SEQUENCE TAGS; PHYTOCHROME-A; TRANSDUCTION PATHWAYS; SEED-GERMINATION; L HEYNH; MUTANTS; DEFICIENT; ORIENTATION; PERCEPTION; SEEDLINGS
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/20549
- DOI
- 10.1046/j.1365-313x.1998.00307.x
- ISSN
- 0960-7412
- Article Type
- Article
- Citation
- PLANT JOURNAL, vol. 16, no. 4, page. 411 - 419, 1998-11
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