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Epigenetic Mechanisms in Nematode-Plant Interactions.

Epigenetic mechanisms play fundamental roles in regulating numerous biological processes in various developmental and environmental contexts. Three highly interconnected epigenetic control mechanisms, including small noncoding RNAs, DNA methylation, and histone modifications, contribute to the establishment of plant epigenetic profiles. During the past decade, a growing body of experimental work has revealed the intricate, diverse, and dynamic roles that epigenetic modifications play in plant-nematode interactions. In this review, I summarize recent progress regarding the functions of small RNAs in mediating plant responses to infection by cyst and root-knot nematodes, with a focus on the functions of microRNAs. I also recapitulate recent advances in genome-wide DNA methylation analysis and discuss how cyst nematodes induce extensive and dynamic changes in the plant methylome that impact the transcriptional activity of genes and transposable elements. Finally, the potential role of nematode effector proteins in triggering such epigenome changes is discussed. Expected final online publication date for the Annual Review of Phytopathology, Volume 58 is August 25, 2020. Please see http://www.annualreviews.org/page/journal/pubdates for revised estimates.