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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.
The Plant Journal – Wiley
Published: Nov 1, 1998
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