Pre- and Postinvasion Defenses Both Contribute to Nonhost Resistance in Arabidopsis

Author:

Lipka Volker12345,Dittgen Jan12345,Bednarek Pawel12345,Bhat Riyaz12345,Wiermer Marcel12345,Stein Monica12345,Landtag Jörn12345,Brandt Wolfgang12345,Rosahl Sabine12345,Scheel Dierk12345,Llorente Francisco12345,Molina Antonio12345,Parker Jane12345,Somerville Shauna12345,Schulze-Lefert Paul12345

Affiliation:

1. Department of Plant Microbe Interactions, Max Planck Institute for Plant Breeding Research, Carl von Linné Weg 10, D-50829 Köln, Germany.

2. Department of Plant Biology, Carnegie Institute of Washington, Stanford, CA 94305, USA.

3. Department of Stress and Developmental Biology.

4. Department of Bioorganic Chemistry, Institute of Plant Biochemistry, Weinberg 3, D-06120 Halle (Saale), Germany.

5. Laboratorio de Bioquímica y Biología Molecular, Departamento de Biotecnología-Universidad Politécnica de Madrid Escuela Técnica Superior de Ingenieros Agrónomos, Avenida Complutense s/n, E-28040 Madrid, Spain.

Abstract

Nonhost resistance describes the immunity of an entire plant species against nonadapted pathogen species. We report that Arabidopsis PEN2 restricts pathogen entry of two ascomycete powdery mildew fungi that in nature colonize grass and pea species. The PEN2 glycosyl hydrolase localizes to peroxisomes and acts as a component of an inducible preinvasion resistance mechanism. Postinvasion fungal growth is blocked by a separate resistance layer requiring the EDS1-PAD4-SAG101 signaling complex, which is known to function in basal and resistance ( R ) gene–triggered immunity. Concurrent impairment of pre- and postinvasion resistance renders Arabidopsis a host for both nonadapted fungi.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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