Peronospora violacea
| Peronospora violacea | |
|---|---|
| |
| A flowerhead of Succisa pratensis infected by Peronospora violacea. | |
Scientific classification 
| |
| Domain: | Eukaryota |
| Clade: | Diaphoretickes |
| Clade: | SAR |
| Clade: | Stramenopiles |
| Phylum: | Oomycota |
| Order: | Peronosporales |
| Family: | Peronosporaceae |
| Genus: | Peronospora |
| Species: | P. violacea |
| Binomial name | |
| Peronospora violacea Berkeley, 1860 | |
Peronospora violacea is a floricolous downy mildew which infects plants in the Caprifoliaceae. It has been reported from hosts in the genera Dipsacus, Knautia, Lomelosia, Scabiosa, and Succisa.[1]
It produces conidiophores on the petals and styles of the host, oospores inside the petal and style tissue, and suppresses the development of the anthers. Infection is systemic, with hyphae produced in the xylem of the host rhizomes and stems.[2]
In infected plants of Succisa pratensis the flowers have longer, pinker petals on which the conidophores are produced.[3] However, other authors report that on the same host it causes the host corollas to be brownish and dead-looking.[4]
Gallery
Conidiophores of Peronospora violacea on a petal of Succisa pratensis, viewed under the microscope.
Flowerheads of Succisa pratensis, infected (right) and uninfected (left) with Peronospora violacea.
References
- ^ Ellis, W. N. (2024). "Peronospora violacea". bladmineerders.nl. Retrieved 13 September 2024.
- ^ Horáková, J., Skalický, V. (1989). "Contribution to the ecology of Peronospora violacea Berk". Česká Mykologie. 43 (1): 13–29.
- ^ Dalzell, J. (2024). "Pathogens in Grassland". Field Guide to Plant Pathogens. Retrieved 19 December 2024.
- ^ Chater, A. O., Woods, R. G., Stringer, R. N., Evans, D. A., Smith, P. A. (2020). Downy Mildews (Peronosporaceae) and White Blister-Rusts (Albuginaceae) of Wales = Llwydni Gwlannog (Peronosporaceae) a Rhydau-Pothelli Gwynion (Albuginaceae) Cymru. A.O. Chater. ISBN 978-0-9565750-4-3.