@ARTICLE{TreeBASE2Ref30229, author = {Petya Christova and Kaloyan Valentinov Kostov and Aneta Lyubenova and Slavtcho Slavov}, title = {Phytophthora sp. kelmania x P. sansomeana ? a new hybrid from subclade 8a found in Bulgaria}, year = {2019}, keywords = {Phytophthora, hybrid, pathogenicity, legumes, ornamentals }, doi = {}, url = {http://}, pmid = {}, journal = {Mycologia}, volume = {}, number = {}, pages = {}, abstract = {The isolate RLKam2016/61c is a part of Phytophthora collection including 252 isolates that was created during an investigation of rivers and streams in Bulgaria. The isolate was initially identified as Phytophthora sansomeana according to the DNA sequence of the ITS region. Additional phylogenetic analysis and the observed polymorphisms in the nuclear DNA (ITS, Btub and tef1), but not in the mitochondrial cox1 gene, led to a conclusion that the isolate RLKam2016/61c is a hybrid between Phytophthora sp. kelmania and P. sansomeana. Phylogenetically both parental species P. sp. kelmania and P. sansomeana belong to the subclade 8a. The new hybrid named Phytophthora sp. kelmania ? Phytophthora sansomeana is characterized by fast growing on V8 and CA, moderate aerial mycelium with radiate pattern of the colonies and relatively slower growth rate on MEA and PDA, petaloid to rosaceous pattern of the colonies with fluffy aerial mycelium. The optimum growth temperature for P. sp. kelmania ? P. sansomeana was approximately at 25?C with an average rate of 9 mm per day. Abundant sporangia formation of the isolate in spring water was observed and the hybrid appears to be sterile in culture. Pathogenicity analyses of P. sp. kelmania ? P. sansomeana - RLKam2016/61c was conducted in comparison with P. pseudocryptogea - RLKam2016/63b as the most closely related species in our collection, also belonging to the subclade 8a. The inhibition effect on the root growth of young seedlings of two legumes - common pea and vetch, as well as on cuttings of the ornamental plant coleus induced by both phytopathogens was significant. No effect of either the new hybrid P. sp. kelmania ? P. sansomeana or P. pseudocryptogea on the growth of maize seedlings was observed. Possible ways for the appearance of the hybrid are discussed, considering that neither of the two parental species has been found in the country so far.} }

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