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      First Report of Phytophthora capsici Causing Wilting and Root and Crown Rot on Capsicum annuum (Bell Pepper) in Ecuador

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          A multi-locus phylogeny for Phytophthora utilizing markers derived from complete genome sequences.

          Phytophthora species are devastating plant pathogens in both agricultural and natural environments. Due to their significant economic and environmental impact, there has been increasing interest in Phytophthora genetics and genomics, culminating in the recent release of three complete genome sequences (P. ramorum, P. sojae, and P. infestans). In this study, genome and other large sequence databases were used to identify over 225 potential genetic markers for phylogenetic analyses. Here, we present a genus-wide phylogeny for 82 Phytophthora species using seven of the most informative loci (approximately 8700 nucleotide sites). Our results support the division of the genus into 10 well-supported clades. The relationships among these clades were rigorously evaluated using a number of phylogenetic methods. This is the most comprehensive study of Phytophthora relationships to date, and many newly discovered species have been included. A more resolved phylogeny of Phytophthora species will allow for better interpretations of the overall evolutionary history of the genus.
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            Phylogenetic analysis of Phytophthora species based on mitochondrial and nuclear DNA sequences.

            A molecular phylogenetic analysis of the genus Phytophthora was performed, 113 isolates from 48 Phytophthora species were included in this analysis. Phylogenetic analyses were performed on regions of mitochondrial (cytochrome c oxidase subunit 1; NADH dehydrogenase subunit 1) and nuclear gene sequences (translation elongation factor 1alpha; beta-tubulin) and comparisons made to test for incongruence between the mitochondrial and nuclear data sets. The genus Phytophthora was confirmed to be monophyletic. In addition, results confirm that the classical taxonomic grouping as described by [Waterhouse (1963)] does not reflect true phylogenetic relations. Phytophthora species were redistributed into 8 clades, providing a more accurate representation of phylogenetic relationships within the genus Phytophthora. The evolution and transition of morphological, pathogenic, and reproductive traits was inferred from the cladogram generated in this study. Mating system was inferred to be a homoplasious trait, with at least eight independent transitions from homothallism to heterothallism observed.
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              A COX2 Molecular Phylogeny of the Peronosporomycetes

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                Author and article information

                Contributors
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                Journal
                Plant Disease
                Plant Disease
                Scientific Societies
                0191-2917
                1943-7692
                July 2020
                July 2020
                : 104
                : 7
                : 2032
                Affiliations
                [1 ]Universidad Técnica de Manabí, Departamento de Ciencias Agronómicas, Portoviejo, 130105, Ecuador
                [2 ]Universidade de Brasília, Departamento de Fitopatologia, Brasilia, DF, Brazil
                [3 ]Universidad Técnica de Manabí, Facultad de Ingeniería Agronómica, Lodana, Santa Ana, Ecuador
                [4 ]Universidad Nacional de Colombia, Sede Palmira, Colombia
                [5 ]Escuela Superior Politécnica Agropecuaria de Manabí, Carrera de Ingeniería Agrícola, Campus Politécnico El Limón, Calceta, Ecuador
                Article
                10.1094/PDIS-11-19-2432-PDN
                5da5108b-a7e0-434b-b200-9e640047bf83
                © 2020
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