Phylum: Oomycota




Дата канвертавання25.04.2016
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Phylum: Oomycota

This division contains about 450 species, and includes water molds, white rusts, and downy mildews. They are distinguished from the chytrids by having exclusively diploid assimilative hyphae. The cell walls of these organisms are composed largely of cellulose or cellulose-like polymers, thus differing markedly from the cell walls of the fungi. They range from unicellular forms to highly branched, coenocytic filamentous ones.

Most species of Oomycota can reproduce both sexually and asexually. Sexual reproduction is said to be "oogamous" A gamete nucleus from an antheridium (male gametangium) moves into an oogonium (female gametangium), through direct contact of the antheridium and oogonium, and fuses with an oosphere (egg). The result is an oospore (the zygote, a thick walled sexually produced spore) which is not motile. Asexual reproduction is by means of zoospores, that have two flagella - one tinsel and one whiplash. In this lab you will examine two orders of Oomycota, one aquatic, and one terrestrial.

Phylum: Oomycota

This division contains about 450 species, and includes water molds, white rusts, and downy mildews. They are distinguished from the chytrids by having exclusively diploid assimilative hyphae. The cell walls of these organisms are composed largely of cellulose or cellulose-like polymers, thus differing markedly from the cell walls of the fungi. They range from unicellular forms to highly branched, coenocytic filamentous ones.



Most species of Oomycota can reproduce both sexually and asexually. Sexual reproduction is said to be "oogamous" A gamete nucleus from an antheridium (male gametangium) moves into an oogonium (female gametangium), through direct contact of the antheridium and oogonium, and fuses with an oosphere (egg). The result is an oospore (the zygote, a thick walled sexually produced spore) which is not motile. Asexual reproduction is by means of zoospores, that have two flagella - one tinsel and one whiplash. In this lab you will examine two orders of Oomycota, one aquatic, and one terrestrial.


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