Information om | Engelska ordet GAMETANGIA

Exempel på hur man kan använda GAMETANGIA i en mening

• Bryophytes produce enclosed reproductive structures (gametangia and sporangia), but they do not produce flowers or seeds.
• A gametangium (: gametangia) is a sex organ or cell in which gametes are produced that is found in many multicellular protists, algae, fungi, and the gametophytes of plants.
• Mucoralean fungi are typically fast-growing, and their wide hyphae (long, filamentous structures) lack septa (multi-perforate septa are present only in sporangiophores and gametangia).
• Mortierella forms zygospores that are the developmental consequence of plasmogamy between gametangia belonging to complementary mating types.
• Phytophthora capsici produces both a male and a female type gametangia called an antheridium (male) and an oogonium (female).
• Progametangia from each strain grow towards each other and fuse into gametangia, forming a thick-walled zygospore.
• Coleochaete has a sterile jacket of cells that surround the gametangia and zygotes that are protected by a layer of sterile cells after fertilization.
• In mosses, liverworts and ferns (Archegoniata), the gametophores support gametangia (sex organs, female archegonia and male antheridia).
•  fusiger is homothallic, and sexual spores known as zygospores are produced following the union of branches called gametangia, that arise from the same mycelium.
• The gametophytes are dioecious (Dioecy) but no structural difference can be detected between the gametangia of male and female isolates.
• The trunk-like basal cell also gives rise to numerous dichotomously branched side branches that terminate as either resistant sporangia, zoosporangia, or gametangia depending on the life cycle stage.
• bertholletiae, heterothallic mating occurs when hyphae of opposite mating types are stimulated by mutually-secreted pheromones to grow toward each other and differentiate into gametangia.
• Female gametangia are present throughout the year, and they develop either on branched or unbranched stalks within the conceptacle, or directly from the walls of conceptacles.
• Zygospores of this fungus are only produced following the fusion of gametangia of compatible mating strains, exemplifying a heterothallic mating system.
• The gametophytes are monomorphic, that is, the male and female gametophytes are indistinguishable until they form gametangia (gamete-producing cells); no other member of the Laminariales has a similar arrangement, which is considered to be a primitive trait.
• In the next stage, septae are established to limit the developing zygospore from the vegetative mycelium and in this way the zygophores become suspensor hyphae and gametangia are formed.
• Then the process of meiosis occurs, where gametes are produced in the gametangia, the male gametangium (also known as the spermatogonangium) burst to release quadriflagellate spermia, which divide into biflagellate sperma and again into unflagellate sperm (or just sperm), this process takes about twelve hours to complete.
• Shown in Mucorales, sexual reproduction is under the control of mating type genes, sexP and sexM, which regulate the production of pheromones required for the maturation of hyphae into gametangia.
• Spermatangia (male gametangia) are spherical (4–8 μm in diameter) and colorless, usually clustered at the end of filaments, sometimes also on branches carrying carpogonia.

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