Labyrinthula terrestris

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cells of a marine species of Labyrinthula (click on image to enlarge it)
Author(s): Schwelm et al.
Source: Molecular Plant Pathology (2018) 19 (4) p. 1036

Labyrinthula terrestris D.M. Bigelow, M.W. Olsen & Gilb. 2005 - (rapid blight of turf grass)

This plant pathogen is found in temperate regions and infects turfgrass irrigated with water of high salinity. Infected grass appears in patches, up to several metres wide, with chlorosis and orange-brown necrotic lesions. The pathogen typically enters through wounds, like those created when grass is cut. It then moves through the plant, infecting all parts.

Cells of Labyrinthula have a size of around 15 x 5 µm and multiply vegetatively inside the plant cells. No sexual forms or spores are known. However, the pathogen aggregates under certain conditions and these groups of cells are believed to help it survive outside the plant. L. terrestris is the only terrestrial species of Labyrinthula, a genus known as infecting seagrass.