Pectobacterium atrosepticum
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Author(s): Amy Charkowski
Source: Wikimedia Commons
Pectobacterium atrosepticum (van Hall 1902) Gardan et al. 2003
This bacterium causes the important blackleg disease on potato stems and tuber soft rot. The symptoms include stunting, chlorosis and brown to black discoloration of underground parts of the plant which lead to soft rot. Young plants affected by the disease usually wilt and die. Older plants may contain the disease and show few symptoms, but can still experience yield losses (Helias et al., 2000).
P. atrosepticum is seed-borne and management of the disease is primarily based on reducing the contamination level in seed potatoes by using healthy tissue culture plantlets to initiate seed potato stocks. In addition, the contamination level can be determined in the seed potatoes before planting (e.g. see Pérombelon, 2000). However, the results from seed testing might not be able to predict the development of blackleg symptoms when infections are latent (de Werra, 2020).
P. atrosepticum is closely related to Pectobacterium carotovorum and has been originally described as a subspecies of P. carotovorum. Pectobacterium carotovorum subsp. carotovorum and other species of Pectobacterium (e.g. P. brasiliense) can also cause potato black leg, as can Dickeya species.
| Vernacular names | |
|---|---|
| • Deutsch: | Schwarzbeinigkeit der Kartoffel |
| • English: | potato blackleg potato tuber soft rot |
| • Français: | jambe noire de la pomme de terre |
Synonyms:
Pectobacterium carotovorum atroseptica
Erwinia carotovora atroseptica
