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A spore which is produced by heterogamous fertilization and from which the sporophytic generation develops.



the resting zygote in lower plants that have an oogonium. The oospore has a considerable reserve of nutritive matter, which is used during sprouting, and a thick, multilayer wall, which provides protection from such unfavorable conditions as drought or cold. When the oospore sprouts, its nucleus divides with reduction.

References in periodicals archive ?
An SEM study of developmental variation in oospore wall ornamentation of three Nitella species (Charophyta) in Australia.
Determination of viability of Phytophthora capsici oospores with tetrazolium bromide staining test versus a plasmolysis method.
According to macrofossil data, the number of Chara oospores and Potamogeton seeds decreased significantly in comparison with the previous zone.
After fertilization of an oogonium, the resulting oospore was retained on the female thallus and underwent a number of cell divisions to produce a multicellular 'fruit'.
Inoculum was provided by soilborne oospores, the levels of which had been built up over the years by ploughing infected plants into the soil following each screen, and airborne sporangia from rows of infected 7042(S) and HB 3 genotypes planted every 9th row.
Some of the new strains resist fungicides and may mate with strains already here and produce the long-lived oospores.
At the same time Cristatella mucedo statoblasts appear in the sediment record and the abundance of Characeae oospores rises considerably.
Oospore production in PDC is reported (Singh and Chauhan, 1988) but it was not further reported from other places.