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Genetic identification of FIN2, a far red light‐specific signaling component of Arabidopsis thaliana
Author(s) -
Soh Moon Soo,
Hong Sung Hyun,
Hanzawa Hiroko,
Furuya Masaki,
Nam Hong Gil
Publication year - 1998
Publication title -
the plant journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.058
H-Index - 269
eISSN - 1365-313X
pISSN - 0960-7412
DOI - 10.1046/j.1365-313x.1998.00307.x
Subject(s) - phytochrome , phytochrome a , mutant , arabidopsis , arabidopsis thaliana , biology , far red , mutation , cotyledon , hypocotyl , genetics , microbiology and biotechnology , botany , gene , red light
Summary 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 ofArabidopsis 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 namedfin2–1is not allelic to aPHYAmutation. Furthermore, immunoblot analysis indicated that the amount of the phytochrome A apoprotein in thefin2–1mutant was comparable to that in wild type. Seedling of thefin2–1mutant 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 theCABandCHSgenes were impaired by thefin2–1mutation: 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.