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Arabidopsis MAP kinase phosphatase 1 and its target MAP kinases 3 and 6 antagonistically determine UV-B stress tolerance, independent of the UVR8 photoreceptor pathway
JournalArticle (Originalarbeit in einer wissenschaftlichen Zeitschrift)
 
ID 1006536
Author(s) Besteiro, M. A. G.; Bartels, Sebastian; Albert, A.; Ulm, R.
Author(s) at UniBasel Merker, Sebastian
Year 2011
Title Arabidopsis MAP kinase phosphatase 1 and its target MAP kinases 3 and 6 antagonistically determine UV-B stress tolerance, independent of the UVR8 photoreceptor pathway
Journal Plant Journal
Volume 68
Number 4
Pages / Article-Number 727-37
Abstract Plants perceive UV-B radiation as an informational signal by a pathway involving UVR8 as UV-B photoreceptor, activating photomorphogenic and acclimation responses. In contrast, the response to UV-B as an environmental stress involves mitogen-activated protein kinase (MAPK) signalling cascades. Whereas the perception pathway is plant specific, the UV-B stress pathway is more broadly conserved. Knowledge of the UV-B stress-activated MAPK signalling pathway in plants is limited, and its potential interplay with the UVR8-mediated pathway has not been defined. Here, we show that loss of MAP kinase phosphatase 1 in the mutant mkp1 results in hypersensitivity to acute UV-B stress, but without impairing UV-B acclimation. The MKP1-interacting proteins MPK3 and MPK6 are activated by UV-B stress and are hyperactivated in mkp1. Moreover, mutants mpk3 and mpk6 exhibit elevated UV-B tolerance and partially suppress the UV-B hypersensitivity of mkp1. We show further that the MKP1-regulated stress-response MAPK pathway is independent of the UVR8 photoreceptor, but that MKP1 also contributes to survival under simulated sunlight. We conclude that, whereas UVR8-mediated acclimation in plants promotes UV-B-induced defence measures, MKP1-regulated stress signalling results when UV-B protection and repair are insufficient and damage occurs. The combined activity of these two mechanisms is crucial to UV-B tolerance in plants.
Publisher Wiley
ISSN/ISBN 0960-7412 ; 1365-313X
edoc-URL http://edoc.unibas.ch/46920/
Full Text on edoc No
Digital Object Identifier DOI 10.1111/j.1365-313X.2011.04725.x
PubMed ID http://www.ncbi.nlm.nih.gov/pubmed/21790814
ISI-Number 000297514900014
Document type (ISI) Journal Article
 
   

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