ROS open roads to roundworm infection.
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The rapid production of reactive oxygen species (ROS) upon pathogen attack is generally considered a defense mechanism for microbial killing and an initiation of host defense responses in plants and animals. In this issue, Siddique et al. show that nicotinamide adenine dinucleotide phosphate oxidase-derived ROS function as a pathogenicity factor to promote the roundworm nematode infection in Arabidopsis thaliana, revealing the complex action of ROS in host-pathogen interactions.