01728nas a2200145   4500008004100000022001400041245011800055210006900173260001600242520120000258100002201458700001901480700001801499856006501517       2017                        eng d  a0031-949X00aGenotypic diversity of Phytophthora cinnamomi and P. plurivora in Maryland’s nurseries and Mid-Atlantic forests0 aGenotypic diversity of Phytophthora cinnamomi and P plurivora in  cJul-02-20173 a<p>Genetic diversity of two <em>Phytophthora</em> species, <em>P. cinnamomi</em> (102 isolates) and <em>P. plurivora</em> (186), commonly encountered in Maryland nurseries and forests in the Mid-Atlantic United States was characterized using amplified fragment length polymorphism (AFLP). Expected heterozygosity and other indices suggested a lower level of diversity among <em>P. cinnamomi</em> than <em>P. plurivora</em>. Hierarchical clustering showed <em>P. cinnamomi</em> isolates separated into four clusters, and two of the largest clusters were closely related, containing 80% of the isolates. In contrast, P. plurivora isolates separated into six clusters, one of which included approximately 40% of the isolates. <em>P. plurivora</em> isolates recovered from the environment (e.g. soil, water) were genotypically more diverse than those found causing lesions. For both species, isolate origin (forest vs. nursery or among nurseries) was a significant factor of heterozygosity. Clonal groups existed within <em>P. cinnamomi</em> and <em>P. plurivora</em> and included isolates from both forest and nurseries, suggesting that a pathway from nurseries to forests or visa verse exists.</p>1 aBeaulieu, Justine1 aFord, Blain, B1 aBalci, Yilmaz  uhttp://apsjournals.apsnet.org/doi/10.1094/PHYTO-05-16-0215-R