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First published online June 18, 2004; 10.1105/tpc.021832

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The Plant Cell 16:1925-1937 (2004)
© 2004 American Society of Plant Biologists

Arabidopsis RADICAL-INDUCED CELL DEATH1 Belongs to the WWE Protein–Protein Interaction Domain Protein Family and Modulates Abscisic Acid, Ethylene, and Methyl Jasmonate Responses

Reetta Ahlforsa,1, Saara Långa,1,2, Kirk Overmyera,1,3, Pinja Jaspersa, Mikael Broschéa, Airi Tauriainena, Hannes Kollista, Hannele Tuominena,4, Enric Belles-Boixb,5, Mirva Piippoc, Dirk Inzéb, E. Tapio Palvaa and Jaakko Kangasjärvia,6

a Department of Biological and Environmental Sciences, Viikki Biocenter, University of Helsinki, 00014 Helsinki, Finland
b Department of Plant Systems Biology, Flanders Interuniversity Institute for Biotechnology, Ghent University, B-9052 Ghent, Belgium
c Department of Biology, University of Turku, FIN-20014 Turku, Finland

6 To whom correspondence should be addressed. E-mail jaakko.kangasjarvi{at}helsinki.fi; fax 358-9-191-59552.

Experiments with several Arabidopsis thaliana mutants have revealed a web of interactions between hormonal signaling. Here, we show that the Arabidopsis mutant radical-induced cell death1 (rcd1), although hypersensitive to apoplastic superoxide and ozone, is more resistant to chloroplastic superoxide formation, exhibits reduced sensitivity to abscisic acid, ethylene, and methyl jasmonate, and has altered expression of several hormonally regulated genes. Furthermore, rcd1 has higher stomatal conductance than the wild type. The rcd1-1 mutation was mapped to the gene At1g32230 where it disrupts an intron splice site resulting in a truncated protein. RCD1 belongs to the (ADP-ribosyl)transferase domain–containing subfamily of the WWE protein–protein interaction domain protein family. The results suggest that RCD1 could act as an integrative node in hormonal signaling and in the regulation of several stress-responsive genes.




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