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Phytochrome signalling modulates the SA‐perceptive pathway in Arabidopsis by Thierry Genoud; Antony J. Buchala; Nam‐Hai Chua; Jean‐Pierre Métraux is a Agricultural and Biological Sciences article available to read on EtoBox.

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## Summary 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 __PR__s was strictly dependent on light, but independent of functional chloroplasts. Taken together, these data demonstrate that t

Who reads Phytochrome signalling modulates the SA‐perceptive pathway in Arabidopsis?

Author

Thierry Genoud; Antony J. Buchala; Nam‐Hai Chua; Jean‐Pierre Métraux

Publisher

John Wiley and Sons; Wiley (Blackwell Publishing); Blackwell Publishing Inc.; Wiley (ISSN 0960-7412)

Published

2002

Language

EN

Field

Agricultural and Biological Sciences (Life Sciences)