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» Articles » PMID: 10982420

RSF1, an Arabidopsis Locus Implicated in Phytochrome A Signaling

Overview
Journal Plant Physiol
Specialty Physiology
Date 2000 Sep 12
PMID 10982420
Citations 45
Authors
C Fankhauser
J Chory
Affiliations
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Abstract

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.

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