Verticillium longisporum
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Author(s): E. Diederichsen, Freie Universität Berlin
Source: PaDIL
Verticillium longisporum (C. Stark) Karapapa, Bainbr. & Heale
The fungus causes wilt of oilseed rape and other crucifers and is related to Verticillium dahliae which has a similar biology. However, it has relatively large-spored conidia, 7-9 µm in contrast to 3.5-6.5 µm for V. dahliae. Both species also differ in the shape of their microsclerotia, usually elongated or irregular in V. longisporum and spherical in V. dahliae.
V. longisporum is soilborne and enters the plant via the roots and colonizes the xylem of roots, stems, and leaves. During late stages of the infection it spreads into senescing tissue and switches from biotrophic to a necrotrophic life style. Typical symptoms of induced diseases are stunted growth and leaf chlorosis.
V. longisporum survives as melanized microsclerotia in the soil for several years. It cannot be controlled by pesticides and is managed through long term crop rotation and resistant cutivars. Research on biological control methods is ongoing.
Synonyms:
Verticillium dahliae var. longisporum
For a review see Depotter et al. (2016).
- Other images of Verticillium longisporum (PaDIL and PLoS ONE - click to enlarge)
growing out of Brassica alboglabra apical stem segments (dark regions indicate the presence of microsclerotia)
colony after 10 days on PDA, 9a = frontal view, 9b = reverse view (scales = 1 cm)
conidia after 35 days on PDA (scale = 20 µm)
9d) elongate microsclerotium after 35 days on PDA, 9e) rounded microsclerotium after 35 days on PDA (scales = 20 µm)
9f) short brown-pigmented hyphae attached to microsclerotium after 35 days on PDA, 9g) elongate microsclerotium from V. longisporum holotype (scales = 20 µm)
