Phytomyxea

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Phytomyxea
Resting spores of different species
Scientific classification Edit this classification
Domain: Eukaryota
Clade: Diaphoretickes
Clade: SAR
Phylum: Endomyxa
Class: Phytomyxea
Cavalier-Smith, 1993
Orders
  • Phagomyxida
  • Plasmodiophorida
Synonyms
  • Phytomyxini Schröter, 1886:133
  • Phytomyxinae MacBride 1892:111; 1899:16; Schröter in Engler & Prantl, 1897; Doflein, 1911:672
  • Phytomyxinea Poche 1913:197
  • Phytomixida Calkins, 1926:328
Life cycle of Plasmodiophora brassicae in cabbage.
Clubroot on cauliflower

The Phytomyxea are a

sugar beets and some spinaches).[3]

Life cycle

They typically develop within plant cells, causing the infected tissue to grow into a gall or scab. Important diseases caused by phytomyxeans include

club root in cabbage and its relatives, and powdery scab in potatoes.[4] These are caused by species of Plasmodiophora and Spongospora, respectively.[5]

The vegetative form is a

plasmodium. This ultimately divides to form new spores, which are released when the host's cells burst. Both resting spores and motile zoospores, which generally have two smooth flagella
, are produced at different stages. Within the plasmodium, dividing nuclei have a distinctive cross-like appearance.

Classification

Plasmodiophoromycota. However, genetic and ultrastructural studies indicate they belong to a diverse group of protists called the Cercozoa
, are closely related to them.

References

Wikispecies has information related to Phytomyxea.
  1. PMID 24559266
    .
  2. PMID 18952499
    .
  3. PMID 29024322
    .
  4. PMID 29024322
    .
  5. ^ Agrios, George N. (2005). Plant Pathology. 5th ed. Academic Press. link.
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