Document Detail

Phytochrome signalling modulates the SA-perceptive pathway in Arabidopsis.
MedLine Citation:
PMID:  12100485     Owner:  NLM     Status:  MEDLINE    
The interaction of phytochrome signalling with the SA signal transduction pathway has been investigated in Arabidopsis using single and multiple mutants affected in light perception (phyA and phyB deficient) and light-signal processing (psi2, phytochrome signalling). The induction of PR1 by SA and functional analogues has been found to strictly correlate with the activity of the signalling pathway controlled by both phyA and phyB photoreceptors. In darkness as well as dim light, and independently of a carbohydrate source, SA-induced PR gene expression as well as the hypersensitive response to pathogens (HR) are strongly reduced. Moreover, the initiation of HR also exhibits a strict dependence upon both the presence and the amplitude of a phytochrome-elicited signal. The growth of an incompatible strain of bacterial a pathogen (Pseudomonas syringae pv. tomato) was enhanced in phyA-phyB and decreased in psi2 mutants. While functional chloroplasts were found necessary for the development of an HR, the induction of PRs was strictly dependent on light, but independent of functional chloroplasts. Taken together, these data demonstrate that the light-induced signalling pathway interacts with the pathogen/SA-mediated signal transduction route. These results are summarized in a formalism that allows qualitative computer simulation.
Thierry Genoud; Antony J Buchala; Nam-Hai Chua; Jean-Pierre Métraux
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  The Plant journal : for cell and molecular biology     Volume:  31     ISSN:  0960-7412     ISO Abbreviation:  Plant J.     Publication Date:  2002 Jul 
Date Detail:
Created Date:  2002-07-08     Completed Date:  2002-09-16     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  9207397     Medline TA:  Plant J     Country:  England    
Other Details:
Languages:  eng     Pagination:  87-95     Citation Subset:  IM    
Département de Biologie, Université de Fribourg, Rte A. Gockel 3, 1700 Fribourg, Switzerland.
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MeSH Terms
Arabidopsis / genetics,  metabolism*,  microbiology,  radiation effects
Arabidopsis Proteins / genetics,  metabolism*
Chloroplasts / metabolism
Genes, Plant
Photoreceptor Cells*
Phytochrome / genetics,  metabolism*
Phytochrome A
Phytochrome B
Plant Proteins / genetics,  metabolism
Pseudomonas / pathogenicity
Salicylic Acid / metabolism*
Signal Transduction
Transcription Factors*
Reg. No./Substance:
0/Arabidopsis Proteins; 0/PHYA protein, Arabidopsis; 0/PHYB protein, Arabidopsis; 0/Phytochrome A; 0/Plant Proteins; 0/Transcription Factors; 0/pathogenesis-related proteins, plant; 11121-56-5/Phytochrome; 136250-22-1/Phytochrome B; 69-72-7/Salicylic Acid

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