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A nonmotile female gamete formed in the oogonium of some algae, fungi, oomycetes, or bryophytes is an oosphere. [2] When fertilized, the oosphere becomes the oospore. [clarification needed] When egg and sperm fuse during fertilisation, a diploid cell (the zygote) is formed, which rapidly grows into a new organism.
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]
The noosphere (alternate spelling noösphere) is a philosophical concept developed and popularized by the biogeochemist Vladimir Vernadsky and philosopher and Jesuit priest Pierre Teilhard de Chardin.
oosphere Female gamete of oomycetes; "egg" of the oogonium. [275] oospore 400x magnification showing oospores of Hyaloperonospora parasitica, a downy mildew The resting spore formed as a result of fertilization of the oosphere. Has a thick, resistant wall.
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The antheridia will then form fertilization tubes connecting the antheridial cytoplasm with each oosphere within the oogonia. A haploid nucleus (gamete) from the antheridium will then be transferred through the fertilization tube into the oosphere, and fuse with the oosphere's haploid nucleus forming a diploid oospore.
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The oosphere fuses with one of the generative nuclei of the pollen grain during double fertilization to give rise to the embryo. The other generative nucleus will fuse with the polar nuclei of the middle cell and give rise to the endosperm. The arrangement of the ovule in the cavity of the ovary is called placentation.