02260nas a2200157 4500008004100000022001300041245012600054210006900180260001200249300001600261490000800277520164800285100001701933700001901950856013301969 2008 eng d a0953756200aPhytophthora gallica sp. nov., a new species from rhizosphere soil of declining oak and reed stands in France and Germany0 aPhytophthora gallica sp nov a new species from rhizosphere soil  c10/2008 a1195 - 12050 v1123 a

A non-papillate, slow-growing Phytophthora species, which could not be assigned to any existing taxon, was isolated from rhizosphere soil of a declining oak in Northeast France, and from the rhizosphere of Phragmites australis at Lake Constance in south-west Germany in 1998 and 2004, respectively. We describe this species, previously informally designated Phytophthora taxon ā€˜Gā€™, as Phytophthora gallica sp. nov. Morphology, growth rates, and pathogenicity against cuttings of riparian tree species and leaves of reed are described and compared with those of morphologically and phylogenetically similar Phytophthora species. P. gallica produces colonies with limited aerial mycelium and variable growth patterns. Gametangia are not formed in single or mixed cultures with tester strains of known mating types. P. gallica produces globose and elongated irregular chlamydospores, of which a high proportion is abortive. In water culture irregular hyphal swellings and non-papillate persistent sporangia are formed abundantly. P. gallica is moderately aggressive to Alnus glutinosa and Fagus sylvatica, weakly aggressive to Quercus robur and Salix alba and non-pathogenic to Fraxinus excelsior and Phragmites australis. According to ITS and mtDNA sequence data P. gallica belongs to a distinct Phytophthora clade, with P. boehmeriae and P. kernoviae being the closest relatives. The origin of P. gallica and its ecological role in wet ecosystems remain unclear.

1 aJung, Thomas1 aNechwatal, Jan uhttps://forestphytophthora.org/references/phytophthora-gallica-sp-nov-new-species-rhizosphere-soil-declining-oak-and-reed-stands