@ARTICLE{TreeBASE2Ref22142, author = {Xiao Yang and Mannon E. Gallegly and Chuan Hong}, title = {A new high-temperature tolerant species in clade 9 of the genus Phytophthora: P. hydrogena sp. nov.}, year = {2013}, keywords = {Phytophthora hydrogena, irrigation water, clade 9, high-temperature tolerance}, doi = {}, url = {http://}, pmid = {}, journal = {Mycologia}, volume = {}, number = {}, pages = {}, abstract = {A previously unknown Phytophthora species was isolated from irrigation water in Virginia, USA. This novel species produces abundant noncaducous and nonpapillate sporangia in soil water extract solution. It sometimes produces chlamydospores and hyphal swellings in aged cultures and in Petri?s solution. This species has optimum vegetative growth at 30 C and grows well at 35 C. The lowest and highest temperatures for its growth are 5 and 40 C. All isolates examined in this study are compatibility type A1 and produce mostly plerotic oospores when paired with an A2 mating type tester of P. cinnamomi. Sequence analyses of the rDNA internal transcribed spacer (ITS) regions and the mitochondrially encoded cytochrome c oxidase 1 (cox 1) gene placed this species in clade 9 of the genus Phytophthora. These characteristics support the description of this taxon as a new species for which we propose the name P. hydrogena sp. nov. Further phylogenetic and physiological investigations of clade 9 species revealed a high-temperature tolerant cluster including P. hydrogena, P. aquimorbida, P. hydropathica, P. irrigata, P. chrysanthemi, P. insolita, P. polonica, and P. parsiana. These species all grow well at high temperature of 35 C. The monophyly of the species in this high-temperature tolerant cluster except P. insolita and P. polonica is highly supported by the maximum likelihood analyses of the ITS and cox 1 sequences. } }

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