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First report of Peronospora verbenae, a downy mildew on Verbena officinalis, in Ukraine

Authors:
Dudka I.O. at M.G. Kholodny Snstitute of Botany of National Academy of Sciences of Ukraine
Dudka I.O.
  • M.G. Kholodny Snstitute of Botany of National Academy of Sciences of Ukraine
Vera P. Hayova at M.G.Kholodny Botany Institute
Vera P. Hayova
Korytnianska V.G.
Korytnianska V.G.
Korytnianska V.G.
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Abstract and Figures

A rare downy mildew, Peronospora verbenae on Verbena officinalis, is newly reported from Ukraine. The species recently described from Germany and recorded in the UK and Czech Republic is unknown outside Europe. Using SEM, additional ultrastructural features of the ultimate branchlets and conidiospore surface were discovered. Original illustrations of the revealed morphological characters are provided.
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Peronospora verbenae sp. nov. – a new downy mildew on Verbena officinalis
Article
Full-text available
  • Jan 2009
Braun, U., Jage, H., Richter, U. & Zimmermann, H. 2009: Peronospora verbenae sp. nov. – a new downy mildew on Verbena officinalis. Schlechtendalia 19: 77– 80. The new species Peronospora verbenae (Chromista, Oomycetes, Peronosporales) on Verbena offici-nalis from Germany is described, illustrated and discussed.-benae sp. nov. – ein neuer Falscher Mehltau auf Verbena officinalis. Schlechtendalia 19: 77– 80. Die neue Art Peronospora verbenae (Chromista, Oomycetes, Peronosporales) auf Verbena officinalis aus Deutschland wird beschrieben, abgebildet und diskutiert.
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Evaluation of characters available from herbarium vouchers for the phylogeny of the downy mildew genera (Chromista, Peronosporales), with focus on scanning electron microscopy
Article
  • Jul 2006
During the past five years numerous molecular phylogenies of the downy mildews have been computed. However, basic relationships of the Peronosporaceae are largely unknown because molecular phylogenies are partly contradicting or do not exhibit sufficient resolution. In this study, all genera of the downy mildews with lasting sporangiophores, which have been classified as belonging to the Peronosporaceae, have been investigated. Ultrastructural synapomorphies for the genera and groups of genera are presented. Especially the fine structure of the ultimate branchlets and haustorium morphology proved to be a suitable tool to differentiate between groups of genera, whereas the commonly used criteria of branching complexity or sporangial germination did not.
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First report of downy mildew caused by Peronospora verbenae on verbena in the Czech Republic
Article
  • Dec 2010
  • PLANT PATHOL
Verbena (Verbena officinalis) is a perennial herb native to Europe, which is widely grown for traditional medicine and tea or for ornamental purposes. In August 2009, plants showing typical symptoms of downy mildew disease were collected in Brno, Czech Republic. In September 2009, plants with symptoms were found also in Olomouc. Infected leaves turned yellow or pale green, with a greyish to brownish fungal-like downy growth developing on the abaxial leaf surface. Detailed microscopic examination of a representative sample (KUS-F24423) was made to identify the pathogen. Conidiophores were subhyaline, tree-like, straight, 250–400 · 7–12 lm, monopodially branched in 5–7 orders, and emergent from stomata. Ultimate branchlets were substraight to slightly curved, 5–12 lm long, 2–3 lm wide, and had obtuse or subacute tips. Conidia were greyish brown to violet, ellipsoidal, with size in the range 25–38 · 17–20 lm, and a length ⁄ width ratio of 1AE3–2AE0. These data are in full agreement with those given forPeronosporaverbenae (Braunetal., 2009). The amplification and sequencing of the ITS rDNA were performed with primers DC6 and ITS4 (Cookeet al., 2000), with the sequence of the region deposited in GenBank (Accession No. GQ919014). Comparison with the sequences available in the GenBank database revealed that the ITS sequence shares a 94% similarity with Peronospora flava. Since this was the first sequence submitted for P. verbenae, no comparable data were available. Downy mildew disease on verbena was first recorded under Plasmopara halstedii from New Mexico, USA (Anonymous 1960, cited in Farr & Rossman, 2009). Plasmopara halstedii, however, is reported only on Helianthus or some related Asteraceae (Leppik, 1966).
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Verbena downy mildew
  • Oct 2009
  • Anonymous
Anonymous. Verbena downy mildew // Plant Clinic News. — 2009, September. — P. 1; http://www.bioimages.org.uk/ html/p7/p78792.php
Verbena downy mildew // Plant Clinic News
  • Sep 2009
  • Anonymous
Anonymous. Verbena downy mildew // Plant Clinic News. -2009, September. -P. 1; http://www.bioimages.org.uk/ html/p7/p78792.php
Fungal Databases, Systematic Mycology and Microbiology Laboratory
  • Jun 2013
  • D F Farr
  • A Y Rossman
  • Sda Ars
Farr D.F., Rossman A.Y. Fungal Databases, Systematic Mycology and Microbiology Laboratory, ARS, SDA. Retrieved June 17, 2013, from http://nt.ars-grin.gov/fungaldatabases/
Conidiospore surface of Peronospora verbenae: verruculose (a, b, d) or almost smooth (c)
  • V P Heluta Fig
V.P. Heluta Fig. 4. Conidiospore surface of Peronospora verbenae: verruculose (a, b, d) or almost smooth (c). Scale bars: 5 μm