Arabidopsis FHY3 specifically gates phytochrome signaling to the circadian clock

被引:73
作者
Allen, Trudie
Koustenis, Athanasios
Theodorou, George
Somers, David E.
Kay, Steve A.
Whitelam, Garry C.
Devlin, Paul F. [1 ]
机构
[1] Royal Holloway Univ London, Sch Biol Sci, Egham TW20 0EX, Surrey, England
[2] Univ Leicester, Dept Biol, Leicester LE1 7RH, Leics, England
[3] Scripps Res Inst, Dept Cell Biol, La Jolla, CA 92037 USA
关键词
D O I
10.1105/tpc.105.037358
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Circadian gating of light signaling limits the timing of maximum responsiveness to light to specific times of day. The fhy3 ( for far- red elongated hypocotyl3) mutant of Arabidopsis thaliana is involved in independently gating signaling from a group of photoreceptors to an individual response. fhy3 shows an enhanced response to red light during seedling deetiolation. Analysis of two independent fhy3 alleles links enhanced inhibition of hypocotyl elongation in response to red light with an arrhythmic pattern of hypocotyl elongation. Both alleles also show disrupted rhythmicity of central- clock and clock- output gene expression in constant red light. fhy3 exhibits aberrant phase advances under red light pulses during the subjective day. Release- from- light experiments demonstrate clock disruption in fhy3 during the early part of the subjective day in constant red light, suggesting that FHY3 is important in gating red light signaling for clock resetting. The FHY3 gating function appears crucial in the early part of the day for the maintenance of rhythmicity under these conditions. However, unlike previously described Arabidopsis gating mutants that gate all light signaling, gating of direct red light - induced gene expression in fhy3 is unaffected. FHY3 appears to be a novel gating factor, specifically in gating red light signaling to the clock during daytime.
引用
收藏
页码:2506 / 2516
页数:11
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