TY  - JOUR
A1  - Goerg, Marlena
A1  - Ploch, Sebastian
A1  - Kruse, Julia
A1  - Kummer, Volker
A1  - Runge, Fabian
A1  - Choi, Young-Joon
A1  - Thines, Marco
T1  - Revision of Plasmopara (Oomycota, Peronosporales) parasitic to Impatiens
JF  - Mycological progress : international journal of the German Mycological Society
N2  - The oomycete Plasmopara obducens was first described on wild Impatiens noli-tangere in Germany in 1877. About 125 years later the first occurrence of P. obducens on cultivated I. walleriana in the United Kingdom was reported, and a worldwide epidemic followed. Although this pathogen is a major threat for ornamental busy lizzy, the identity of the pathogen remained unconfirmed and the high host specificity observed for the genus Plasmopara cast doubts regarding its determination as P. obducens. In this study, using multigene phylogenies and morphological investigation, it is revealed that P. obducens on I. noli-tangere is not the conspecific with the pathogen affecting I. walleriana and another ornamental balsam, I. balsamina. As a consequence, the new names P. destructor and P. velutina are introduced for the pathogens of I. walleriana and I. balsamina, respectively.
KW  - Busy lizzy
KW  - Downy mildew
KW  - Horticulture
KW  - Lady slipper balsam
KW  - New species
KW  - Peronosporaceae
KW  - Taxonomy
KW  - Touch-me-not
Y1  - 2017
U6  - https://doi.org/10.1007/s11557-017-1316-y
SN  - 1617-416X
SN  - 1861-8952
VL  - 16
SP  - 791
EP  - 799
PB  - Springer
CY  - Heidelberg
ER  - 
TY  - JOUR
A1  - Thines, Marco
A1  - Kummer, Volker
T1  - Diversity and species boundaries in floricolous downy mildews
JF  - Mycological progress : international journal of the German Mycological Society
N2  - Floricolous downy mildews are a monophyletic group of members of the genus Peronospora (Oomycota, Peronosporales). These downy mildews can be found on a variety of families of the Asteridae, including Asteraceae, Campanulaceae, Dipsacaceae, Lamiaceae, and Orobanchaceae. With the exception of Peronospora radii, which can also cause economically relevant losses, sporulation usually takes place only on floral parts of their hosts. However, only very few specimens of these mostly inconspicuous downy mildews have so far been included in molecular phylogenies. Focusing on Lamiaceae, we have investigated multiple specimens of floricolous downy mildews for elucidating species boundaries and host specificity in this group. Based on both mitochondrial and nuclear loci, it became apparent that phylogenetic lineages in the Lamiaceae seem to be host genus specific and significant sequence diversity could be found between lineages. Based on distinctiveness in both phylogenetic reconstructions and morphology, the downy mildew on flowers of Stachys palustris is introduced as a new species, Peronospora jagei sp. nov., which can be morphologically distinguished from Peronospora stigmaticola by broader and shorter conidiospores. The diversity of the floricolous down mildews might be higher than previously assumed, although specimens from a much broader set of samples will be needed to confirm this view.
KW  - cox2
KW  - Internal transcribed spacer
KW  - Peronosporaceae
KW  - Phylogeny
Y1  - 2013
U6  - https://doi.org/10.1007/s11557-012-0837-7
SN  - 1617-416X
VL  - 12
IS  - 2
SP  - 321
EP  - 329
PB  - Springer
CY  - Heidelberg
ER  -