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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 ?
First identification key for charophyte oospore from central Europe.
Celakovsky (1874) had recognized three generations in the life cycle of Coleochaete: zoospore-producing thalli (A); gamete-producing thalli (B); and the multicellular body produced from the fertilized oospore (C).
The latter two species are heterothallic thus did not produce oospores and or sexual structures in single cultures.
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.
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.
The pathogen is mainly perpetuated through tuber and soil through production of oospores.
It can be suggested that Hyaloperonospora parasitica persists as oospores in the soil over several years.