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monocyclic polycyclic
Agrios fig. 2-21
Myxomycetes – slime molds
Slime mold on turf – Physarum sp.
Sporangia of Physarum
Club root of cabbage
Plasmodiophora brassicae
http://www1.agric.gov.ab.ca/$department/deptdocs.nsf/all/agdex8593
Spongospora subterranea
Plant Disease Cover ImagesVolume 87 (2003)
Powdery scab galls on roots and stolons of potato
Obligate parasitesVectors for viruses
http://www.potato.org.uk/images/site/suttonbridge/spud/PS2.jpg
Spore Type: Oospore
Oospores
hairy flagella
Hyphae of Oomycetes
Hypha
Oomycetes: Sexual Reproductive
Antheridium
Oogonium
Oospore
Oomycete: Antheridium and Oogonium
Oogonium
Antheridium
Hyphae
Asexual Reproductive Structures
of Oomycetes
Sporangia
Zoospores
• Single cell, but membrane bound
• Product of mitosis
• Released from sporangium
• Motile• Not long lived
Sporangium
Zoospores
Sporangia Borne on Single or Branched Sporangiophores
Lemon to globose shaped
structures are sporangia
Zoospores attracted to infection court
Flagellum
Plant surface
Body ofzoospore