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Plant Physiol, September 2000, Vol. 124, pp. 39-46
RSF1, an Arabidopsis Locus Implicated in
Phytochrome A Signaling1
Christian
Fankhauser* and
Joanne
Chory
Department of Molecular Biology, 30 quai Ernest Ansermet, 1211 Genève 4, Switzerland (C.F.); and Plant Biology Laboratory
and The Howard Hughes Medical Institute, The Salk Institute for
Biological Studies, 10010 North Torrey Pines Road, La Jolla, California
92037 (J.C.)
In Arabidopsis, phytochrome A (phyA) is the major photoreceptor
both for high irradiance responses to far-red light and broad spectrum
very low fluence responses, but little is known of its signaling
pathway(s). rsf1 was isolated as a recessive mutant with
reduced sensitivity to far-red inhibition of hypocotyl elongation. At
the seedling stage rsf1 mutants are affected, to various
degrees, in all described phyA-mediated responses. However, in adult
rsf1 plants, the photoperiodic flowering response is
normal. The rsf1 mutant has wild-type levels of phyA
suggesting that RSF1 is required for phyA signaling rather than phyA
stability or biosynthesis. RSF1 thus appears to be a major phyA
signaling component in seedlings, but not in adult, Arabidopsis plants.
1
This work was supported by grants from the Swiss
National Science Foundation (no. 63-58-151.99 to C.F.) and the U.S.
National Institutes of Health (no. 2RO1 GM52413 to J.C.). C.F. was a
postdoctoral fellow of the Swiss National Science Foundation, and J.C.
is an Investigator of the Howard Hughes Medical Institute.
*
Corresponding author; e-mail christian.fankhauser{at}molbio.unige.ch; fax 41-22-702-6868.
© 2000 American Society of Plant Physiologists
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