Premium
Phytophthora pachypleura sp. nov., a new species causing root rot of Aucuba japonica and other ornamentals in the United Kingdom
Author(s) -
Henricot B.,
Pérez Sierra A.,
Jung T.
Publication year - 2014
Publication title -
plant pathology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.928
H-Index - 85
eISSN - 1365-3059
pISSN - 0032-0862
DOI - 10.1111/ppa.12194
Subject(s) - biology , phytophthora , oospore , botany , sporangium , root rot , ornamental plant , intergenic region , antheridium , phycomycetes , homothallism , horticulture , spore , inoculation , genetics , genome , gene , mating type
Isolates of an unknown Phytophthora species from the ‘ Phytophthora citricola complex’ have been found associated with mortality of Aucuba japonica in the UK . Based on morphological characteristics, growth–temperature relationships, sequences of five DNA regions and pathogenicity assays, the proposed novel species is described as Phytophthora pachypleura . Being homothallic with paragynous antheridia and semipapillate sporangia, P. pachypleura resembles other species in the ‘ P. citricola complex’ but can be discriminated by its distinctively thick‐walled oospores with an oospore wall index of 0·71. In the phylogenetic analysis based on three nuclear ( ITS , β‐tubulin, EF ‐1α ) and two mitochondrial ( cox1 , nadh1 ) DNA regions, P. pachypleura formed a distinct clade within the ‘ P. citricola complex’ with P. citricola s. str ., P. citricola E and P. acerina as its closest relatives. Phytophthora pachypleura is more aggressive to A. japonica than P. plurivora and P. multivora and has the potential to affect other ornamental species.