Oospore

Oospores of Hyaloperonospora parasitica, agent of the downy mildew (in the middle)

An oospore is a thick-walled sexual spore that develops from a fertilized oosphere in some algae, fungi, and oomycetes.^[1] They are believed to have evolved either through the fusion of two species or the chemically-induced stimulation of mycelia, leading to oospore formation.^[2]

In Oomycetes, oospores can also result from asexual reproduction, by apomixis. These are found in fungi as sexual spores which help the sexual reproduction of fungi. These haploid, non-motile spores are the site of meiosis and karyogamy in oomycetes.^[3]

A dormant oospore, when observed under an electron microscope, has led researchers to draw conclusion that there is only a single central globule with other storage bodies surrounding it.^[4]

References[]

^ Tronsmo, Anne, M. (2020). Plant Pathology and Plant Disease. CABI. ISBN 1789243173.
^ Uchida, J. Y.; Aragaki, M. (1980). "Chemical Stimulation of Oospore Formation in Phytophthora capsici". Mycologia. 72 (6): 1103. doi:10.2307/3759563. JSTOR 3759563.
^ Fry, William, E. "Introduction to Oomycetes". American Phytopathological Society. Retrieved 29 March 2021.
^ Ruben, D.M (May 1978). "Ultrastructure of Oospore Germination in Pythiumaphanidermatum". JSTOR. doi:10.2307/2442581. Retrieved 2021-04-04.

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[1] Tronsmo, Anne, M. (2020). Plant Pathology and Plant Disease. CABI. ISBN 1789243173.

[2] Uchida, J. Y.; Aragaki, M. (1980). "Chemical Stimulation of Oospore Formation in Phytophthora capsici". Mycologia. 72 (6): 1103. doi:10.2307/3759563. JSTOR 3759563.

[3] Fry, William, E. "Introduction to Oomycetes". American Phytopathological Society. Retrieved 29 March 2021.

[4] Ruben, D.M (May 1978). "Ultrastructure of Oospore Germination in Pythiumaphanidermatum". JSTOR. doi:10.2307/2442581. Retrieved 2021-04-04.

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