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First published online September 14, 2004; 10.1105/tpc.104.025379

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The Plant Cell 16:2785-2794 (2004)
© 2004 American Society of Plant Biologists

Arabidopsis Nonsymbiotic Hemoglobin AHb1 Modulates Nitric Oxide Bioactivity

Michele Perazzollia,1,2, Paola Dominicia,1, Maria C. Romero-Puertasa, Elisa Zagoa, Jürgen Zeierb, Masatoshi Sonodab, Chris Lambc and Massimo Delledonnea,3

a Dipartimento Scientifico e Tecnologico, Università degli Studi di Verona, 37134 Verona, Italy
b Julius-von-Sachs-Institut für Biowissenschaften, Lehrstuhl für Botanik II, Universität Würzburg, D-97082 Würzburg, Germany
c John Innes Centre, Norwich NR4 7UH, United Kingdom

3 To whom correspondence should be addressed. E-mail massimo.delledonne{at}univr.it; fax 39-045-8027929.

Nitric oxide (NO) is a widespread signaling molecule, and numerous targets of its action exist in plants. Whereas the activity of NO in erythrocytes, microorganisms, and invertebrates has been shown to be regulated by several hemoglobins, the function of plant hemoglobins in NO detoxification has not yet been elucidated. Here, we show that Arabidopsis thaliana nonsymbiotic hemoglobin AHb1 scavenges NO through production of S-nitrosohemoglobin and reduces NO emission under hypoxic stress, indicating its role in NO detoxification. However, AHb1 does not affect NO-mediated hypersensitive cell death in response to avirulent Pseudomonas syringae, suggesting that it is not involved in the removal of NO bursts originated from acute responses when NO mediates crucial defense signaling functions.




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