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