PMID- 10631258
OWN - NLM
STAT- MEDLINE
DCOM- 20000224
LR  - 20240109
IS  - 0032-0889 (Print)
IS  - 1532-2548 (Electronic)
IS  - 0032-0889 (Linking)
VI  - 122
IP  - 1
DP  - 2000 Jan
TI  - Elementary processes of photoperception by phytochrome A for high-irradiance 
      response of hypocotyl elongation in Arabidopsis.
PG  - 147-56
AB  - Elementary processes of photoperception by phytochrome A (PhyA) for the 
      high-irradiance response (HIR) of hypocotyl elongation in Arabidopsis were 
      examined using a newly designed irradiator with LED. The effect of continuous 
      irradiation with far-red (FR) light could be replaced by intermittent irradiation 
      with FR light pulses if given at intervals of 3 min or less for 24 h. In this 
      response, the Bunsen-Roscoe law of reciprocity held in each FR light pulse. 
      Therefore, we determined the action spectrum for the response by intermittent 
      irradiation using phyB and phyAphyB double mutants. The resultant action spectrum 
      correlated well with the absorption spectrum of PhyA in far-red-absorbing 
      phytochrome (Pfr). Intermittent irradiation with 550 to 667 nm of light alone had 
      no significant effect on the response. In contrast, intermittent irradiation with 
      red light immediately after each FR light pulse completely reversed the effect of 
      FR light in each cycle. The results indicate that neither red-absorbing 
      phytochrome synthesized in darkness nor photoconverted Pfr are physiologically 
      active, and that a short-lived signal is induced during photoconversion from Pfr 
      to red-absorbing phytochrome. The mode of photoperception by PhyA for HIR is 
      essentially different from that by PhyA for very-low-fluence responses and 
      phytochrome B for low-fluence responses.
FAU - Shinomura, T
AU  - Shinomura T
AD  - Hitachi Advanced Research Laboratory, Hatoyama, Saitama 350-0395, Japan.
FAU - Uchida, K
AU  - Uchida K
FAU - Furuya, M
AU  - Furuya M
LA  - eng
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
PL  - United States
TA  - Plant Physiol
JT  - Plant physiology
JID - 0401224
RN  - 0 (Arabidopsis Proteins)
RN  - 0 (PHYA protein, Arabidopsis)
RN  - 0 (Phytochrome A)
RN  - 11121-56-5 (Phytochrome)
SB  - IM
MH  - Arabidopsis/metabolism/*physiology/radiation effects
MH  - Arabidopsis Proteins
MH  - Hypocotyl/*growth & development/radiation effects
MH  - Light
MH  - Phytochrome/*metabolism
MH  - Phytochrome A
PMC - PMC58853
EDAT- 2000/01/13 09:00
MHDA- 2000/02/26 09:00
PMCR- 2001/01/01
CRDT- 2000/01/13 09:00
PHST- 2000/01/13 09:00 [pubmed]
PHST- 2000/02/26 09:00 [medline]
PHST- 2000/01/13 09:00 [entrez]
PHST- 2001/01/01 00:00 [pmc-release]
AID - 5841 [pii]
AID - 10.1104/pp.122.1.147 [doi]
PST - ppublish
SO  - Plant Physiol. 2000 Jan;122(1):147-56. doi: 10.1104/pp.122.1.147.