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|Title:||SNARE-protein-mediated disease resistance at the plant cell wall|
|Citation:||Nature, 2003; 425(6961):973-977|
|Publisher:||Nature Publishing Group|
|Nicholas C. Collins, Hans Thordal-Christensen, Volker Lipka, Stephan Bau, Erich Kombrink, Jin-Long Qiu, Ralph Hückelhoven, Mónica Stein, Andreas Freialdenhoven, Shauna C. Somerville and Paul Schulze-Lefert|
|Abstract:||Failure of pathogenic fungi to breach the plant cell wall constitutes a major component of immunity of non-host plant species—species outside the pathogen host range—and accounts for a proportion of aborted infection attempts on 'susceptible' host plants (basal resistance).Neither form of penetration resistance is understood at the molecular level. We developed a screen for penetration (pen) mutants of Arabidopsis, which are disabled in non-host penetration resistance against barley powdery mildew, Blumeria graminis f. sp. hordei, and we isolated the PEN1 gene. We also isolated barley ROR2 , which is required for basal penetration resistance against B. g. hordei. The genes encode functionally homologous syntaxins, demonstrating a mechanistic link between non-host resistance and basal penetration resistance in monocotyledons and dicotyledons. We show that resistance in barley requires a SNAP-25 (synaptosome-associated protein, molecular mass 25 kDa) homologue capable of forming a binary SNAP receptor (SNARE) complex with ROR2. Genetic control of vesicle behaviour at penetration sites, and plasma membrane location of PEN1/ROR2, is consistent with a proposed involvement of SNARE-complex-mediated exocytosis and/or homotypic vesicle fusion events in resistance. Functions associated with SNARE-dependent penetration resistance are dispensable for immunity mediated by race-specific resistance (R) genes, highlighting fundamental differences between these two resistance forms.|
|Keywords:||Cell Wall; Fungi; Arabidopsis; Hordeum; Membrane Proteins; Vesicular Transport Proteins; Nerve Tissue Proteins; Arabidopsis Proteins; Cloning, Molecular; Two-Hybrid System Techniques; Plant Diseases; Protein Binding; Mutation; Molecular Sequence Data; SNARE Proteins; Qa-SNARE Proteins; Synaptosomal-Associated Protein 25|
|Appears in Collections:||Australian Centre for Plant Functional Genomics publications|
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