Document Detail

Antagonistic but complementary actions of phytochromes A and B allow seedling de-etiolation.
MedLine Citation:
PMID:  9193095     Owner:  NLM     Status:  MEDLINE    
Using dichromatic radiation, we show that the actions of phytochromes A and B (phyA and phyB) in Arabidopsis thaliana are antagonistic in mediating red and far-red radiation effects on seedling de-etiolation and yet act in a complementary manner to regulate de-etiolation, irrespective of spectral composition. At low phytochrome photoequilibria inhibition of hypocotyl extension was strong, because of the action of a far-red high-irradiance response mediated by phyA. At high phytochrome photoequilibria inhibition of hypocotyl extension was also strong, because of the action of phyB. At intermediate photoequilibria hypocotyl inhibition was less strong. In their natural environment, this dual action will strongly retard hypocotyl growth and promote cotyledon opening and expansion both in open daylight and under dense vegetation. Overlapping action by phyA and phyB will substantially promote de-etiolation in sparse vegetation. The antagonistic and complementary actions of phyA and phyB, therefore, allow the optimum regulation of seedling growth after emergence from the soil.
H Smith; Y Xu; P H Quail
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Plant physiology     Volume:  114     ISSN:  0032-0889     ISO Abbreviation:  Plant Physiol.     Publication Date:  1997 Jun 
Date Detail:
Created Date:  1997-07-28     Completed Date:  1997-07-28     Revised Date:  2010-09-10    
Medline Journal Info:
Nlm Unique ID:  0401224     Medline TA:  Plant Physiol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  637-41     Citation Subset:  IM; S    
Department of Botany, University of Leicester, United Kingdom.
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MeSH Terms
Arabidopsis / radiation effects*
Arabidopsis Proteins
Cotyledon / radiation effects
Hypocotyl / radiation effects
Photoreceptor Cells*
Phytochrome / antagonists & inhibitors,  radiation effects*
Phytochrome A
Phytochrome B
Transcription Factors*
Grant Support
Reg. No./Substance:
0/Arabidopsis Proteins; 0/PHYA protein, Arabidopsis; 0/PHYB protein, Arabidopsis; 0/Phytochrome A; 0/Transcription Factors; 11121-56-5/Phytochrome; 136250-22-1/Phytochrome B

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