oospore

The storage material is starch, except in the oospore, where oil also occurs.

These white streaks are the location of oospore production.

The zygote produced is named an oospore.

The oospore is then ready to germinate and develop into an adult diploid somatic stage.

Only in Mexico and Scandinavia, however, is oospore formation thought to play a role in overwintering.

In indirect germination, the oospore produces sporangia which release zoospores.

In direct germination, the oospore produces hyphae which directly penetrate host cells at the plant's root tips.

It has been licensed as a biocontrol agent in the form of an oospore soil treatment, which reduces pathogen load and concomitant plant disease.

Studies in Sicily have shown optimum time for oospore germination is between the end of February and the middle of March.

The antheridium fertilizes an oogonium, which then develops into a single oospore, which is 20-35 micrometers in diameter.

Microscopic identification of an oospore that measure around 40 micrometers in diameter from a soybean plant sample is a definite sign of Phytophthora sojae.

Contributions of oospore inoculum to epidemics of grapevine downy mildew (Plasmopara viticola)

An oospore is a thick-walled sexual spore that develops from a fertilized oosphere ( union of oogonium and antheridium) in some algae and fungi.

The germinating oospore undergoes mitosis and gives rise to diploid hyphae which reproduce asexually via mitotic zoospores as long as conditions are favorable.

The fusion of the male antheridia and female oogonia creates a diploid oospore which will eventually germinate into the diploid somatic stage of the thallophyte life cycle.

Karyogamy between these two types of gametangia one being from the A1 sexualtype and the other of the A2 sexual type results in the formation of an overwintering oospore.

A haploid nucleus from the antheridia will then be transferred through the fertilization tube, into the oosphere, and fuse with the oosphere's haploid nucleus forming a diploid oospore.

Flax (Linum usitatissimum) is an example of a trap crop that is used to reduce the amount of oospore inoculum in the soil, before planting a susceptible crop like sorghum or maize.

Oospores can produce a germ tube and infect the plant directly, or, if the environment is favorable (that is an adequate amount of water is present), the oospore may produce sporangia, which in turn produce motile, biflagallete zoospores that swim to the host plant, encyst, and germinate.