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Like other plant pathogens, P. penetrans deploys a battery of secreted protein effectors to manipulate plant hosts and induce disease. Although several candidate effectors of P. penetrans have been identified, detailed mechanisms of their functions and particularly their host targets remain largely unexplored. In this study, a repertoire of candidate genes encoding pioneer effectors of P. penetrans was amplified from mixed life stages of the nematode, and candidate effectors were cloned and subjected to transient expression in a heterologous host, Nicotiana benthamiana, using potato virus X\u2013based gene vector. Among seven analyzed genes, the candidate effector designated as Ppen10370 triggered pleiotropic phenotypes substantially different from those produced by wild type infection. Transcriptome analysis of plants expressing Ppen10370 demonstrated that observed phenotypic changes were likely related to disruption of core biological processes in the plant due to effector-originated activities. Cross-species comparative analysis of Ppen10370 identified homolog gene sequences in five other Pratylenchus species, and their transcripts were found to be localized specifically in the nematode esophageal glands by in situ hybridization. RNA silencing of the Ppen10370 resulted in a significant reduction of nematode reproduction and development, demonstrating an important role of the esophageal gland effector for parasitism.<\/jats:p><jats:p>[Formula: see text] Copyright \u00a9 2021 The Author(s). This is an open access article distributed under the CC BY-NC-ND 4.0 International license .<\/jats:p>","DOI":"10.1094\/mpmi-09-20-0267-r","type":"journal-article","created":{"date-parts":[[2021,1,5]],"date-time":"2021-01-05T18:45:40Z","timestamp":1609872340000},"page":"645-657","source":"Crossref","is-referenced-by-count":5,"title":["The Root Lesion Nematode Effector<i>Ppen10370<\/i>Is Essential for Parasitism of<i>Pratylenchus penetrans<\/i>"],"prefix":"10.1094","volume":"34","author":[{"given":"Paulo","family":"Vieira","sequence":"first","affiliation":[{"name":"United States Department of Agriculture-Agricultural Research Service (USDA-ARS), Molecular Plant Pathology Laboratory, Beltsville, MD 20705-2350, U.S.A."},{"name":"School of Plant and Environmental Science, Virginia Tech, Blacksburg, VA 24061, U.S.A."}]},{"given":"Cl\u00e1udia S. 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