入侵前和入侵后的防御都有助于拟南芥的非寄主抗性。

Pre- and postinvasion defenses both contribute to nonhost resistance in Arabidopsis.

作者信息

Lipka Volker, Dittgen Jan, Bednarek Pawel, Bhat Riyaz, Wiermer Marcel, Stein Monica, Landtag Jörn, Brandt Wolfgang, Rosahl Sabine, Scheel Dierk, Llorente Francisco, Molina Antonio, Parker Jane, Somerville Shauna, Schulze-Lefert Paul

机构信息

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

出版信息

Science. 2005 Nov 18;310(5751):1180-3. doi: 10.1126/science.1119409.

DOI:10.1126/science.1119409

PMID:16293760

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.

摘要

非寄主抗性描述的是整个植物物种对非适应性病原菌物种的免疫能力。我们报告称，拟南芥PEN2限制了两种子囊菌白粉病菌的病原菌入侵，这两种白粉病菌在自然环境中侵染禾本科植物和豌豆。PEN2糖基水解酶定位于过氧化物酶体，并作为诱导性入侵前抗性机制的一个组成部分发挥作用。入侵后真菌生长受到一个单独的抗性层的阻碍，该抗性层需要EDS1-PAD4-SAG101信号复合体，已知该复合体在基础免疫和抗性（R）基因触发的免疫中发挥作用。入侵前和入侵后抗性的同时受损使拟南芥成为这两种非适应性真菌的寄主。