Ultrastructure of oospore development in Albugo candida on rapeseed

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Abstract
The structure and development of oospores of Albugo candida in the stagheads in rapeseed (Brassica campestris) were investigated by light microscopy, transmission electron microscopy of ultrathin sections, and scanning electron microscopy. Development of an oospore, in general, is similar to that in Pythium. A reaction zone is formed in the oogonial wall at the point of contact by the fertilization tube of the antheridium. The oospore has a highly differentiated five-layered cell wall. The periplasm appears to play an active role in deposition of the cell wall of the oospore. Contents of the periplasm do not disappear after maturation of the oospore; instead, they forma persistent material between it and the oogonial wall. Hence, functionally, the oospore wall complex has two additional layers. Longevity of the oospore may be due to the heavily fortified cell wall.

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