title: Plant-Mediated Systemic Interactions Between Pathogens, Parasitic Nematodes, and Herbivores Above- and Belowground.
abstract: Plants are important mediators of interactions between aboveground (AG) and belowground (BG) pathogens, arthropod herbivores, and nematodes (phytophages). We highlight recent progress in our understanding of within- and cross-compartment plant responses to these groups of phytophages in terms of altered resource dynamics and defense signaling and activation. We review studies documenting the outcome of cross-compartment interactions between these phytophage groups and show patterns of cross-compartment facilitation as well as cross-compartment induced resistance. Studies involving soilborne pathogens and foliar nematodes are scant. We further highlight the important role of defense signaling loops between shoots and roots to activate a full resistance complement. Moreover, manipulation of such loops by phytophages affects systemic interactions with other plant feeders. Finally, cross-compartment-induced changes in root defenses and root exudates extend systemic defense loops into the rhizosphere, enhancing or reducing recruitment of microbes that induce systemic resistance but also affecting interactions with root-feeding phytophages.
authors.affiliation: Department of Terrestrial Ecology, Netherlands Institute of Ecology, NIOO-KNAW, 6708 PB Wageningen, The Netherlands; email: a.biere@nioo.knaw.nl.
authors.forename: Arjen
authors.initials: A
authors.lastname: Biere
authors.affiliation: Lab of Nematology, Department of Plant Sciences, Wageningen University, 6700 PB Wageningen, The Netherlands.
authors.forename: Aska
authors.initials: A
authors.lastname: Goverse
mesh_terms: D000818:Animals; D001181:Arthropods / Q000502:physiology; D020387:Food Chain; D060434:Herbivory; D006790:Host-Parasite Interactions; D054884:Host-Pathogen Interactions; D009348:Nematoda / Q000502:physiology; D018521:Plant Physiological Phenomena; D018517:Plant Roots / Q000382:microbiology / Q000469:parasitology; D010944:Plants / Q000382:microbiology* / Q000469:parasitology*
keywords: defense loop; defense suppression; hormone signaling pathways; plant defense; root-shoot interactions