title: Plant systemic induced responses mediate interactions between root parasitic nematodes and aboveground herbivorous insects.
abstract: Insects and nematodes are the most diverse and abundant groups of multicellular animals feeding on plants on either side of the soil-air interface. Several herbivore-induced responses are systemic, and hence can influence the preference and performance of organisms in other plant organs. Recent studies show that plants mediate interactions between belowground plant parasitic nematodes (PPNs) and aboveground herbivorous insects. Based on the knowledge of plant responses to pathogens, we review the emerging insights on plant systemic responses against root-feeding nematodes and shoot-feeding insects. We discuss the potential mechanisms of plant-mediated indirect interactions between both groups of organisms and point to gaps in our knowledge. Root-feeding nematodes can positively or negatively affect shoot herbivorous insects, and vice versa. The outcomes of the interactions between these spatially separated herbivore communities appear to be influenced by the feeding strategy of the nematodes and the insects, as well as by host plant susceptibility to both herbivores. The potential mechanisms for these interactions include systemic induced plant defense, interference with the translocation and dynamics of locally induced secondary metabolites, and reallocation of plant nutritional reserves. During evolution, PPNs as well as herbivorous insects have acquired effectors that modify plant defense responses and resource allocation patterns to their advantage. However, it is also known that plants under herbivore attack change the allocation of their resources, e.g., for compensatory growth responses, which may affect the performance of other organisms feeding on the plant. Studying the chemical and molecular basis of these interactions will reveal the molecular mechanisms that are involved. Moreover, it will lead to a better understanding of the ecological relevance of aboveground-belowground interactions, as well as support the development of sustainable pest management technologies.
authors: Department of Ecogenomics, Institute for Water and Wetland Research Radboud University Nijmegen, Nijmegen, Netherlands ; School of Plant Sciences, Haramaya University Dire Dawa, Ethiopia.
authors: Mesfin
authors: M
authors: Wondafrash
authors: Nicole M
authors: NM
authors: Van Dam
authors: Tom O G
authors: TO
authors: Tytgat
keywords: aboveground–belowground interactions; herbivores; secondary plant compounds; signaling interactions; systemic induced plant defense
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