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RAB5 GTPases at the interface between plants and pathogens
RAB5 GTPases are key players in endosomal trafficking. Inada et al (on pp. 1854-1864) found that plant RAB5s, but not their activator VPS9a, accumulate at the interfacial membrane between host plants and biotrophic fungal and/or oomycete pathogens. This discovery highlights the unique nature of the interfacial membrane and will provide a basis to understanding the interaction mechanisms between plants and pathogens.
The cover image shows Arabidopsis thaliana leaves infected with oomycete Hyaloperonospora arabidopsidis (upper right) or powdery mildew fungus Golovinomyces orontii (lower left), and confocal laser scanning micrographs showing accumulation of a GFP-tagged plant-specific RAB5, ARA6 (green), at the haustorium membrane surrounding the infection hyphae (G. orontii fungal structures are shown in red). Oomycete and powdery mildew images supplied by Shigeyuki Betsuyaku (Univ. of Tokyo, Japan) and Takashi Ueda (NIBB, Japan), and by Noriko Inada (NAIST, Japan), respectively.
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