Current Status of the Plasmodiophorids

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Abstract
Plasmodiophorids are a monophyletic group with uncertain systematic affinities. Features of the group include cruciform nuclear division; obligate, intracellular parasitism; biflagellated, heterocont zoospores; and environmentally resistant resting spores. Economically significant members of the group include Plasmodiophora brassicae, the causative agent of clubroot of cabbage; Spongospora subterranea, the causative agent of powdery scab of potato; and two members of the genus Polymyxa, vectors for several plant pathogenic viruses.