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Genetic identification of FIN2, a far red light‐specific signaling component of Arabidopsis thaliana

Genetic identification of FIN2, a far red light‐specific signaling component of Arabidopsis thaliana 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 light but not in Rc light. The results showed that the mutation occurred in a downstream signaling component potentially specific to PhyA. Other PhyAmediated 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. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png The Plant Journal Wiley

Genetic identification of FIN2, a far red light‐specific signaling component of Arabidopsis thaliana

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References (51)

Publisher
Wiley
Copyright
Copyright © 1998 Wiley Subscription Services, Inc., A Wiley Company
ISSN
0960-7412
eISSN
1365-313X
DOI
10.1046/j.1365-313x.1998.00307.x
Publisher site
See Article on Publisher Site

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 light but not in Rc light. The results showed that the mutation occurred in a downstream signaling component potentially specific to PhyA. Other PhyAmediated 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.

Journal

The Plant JournalWiley

Published: Nov 1, 1998

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