Synonymer & Information om | Engelska ordet ANTHERIDIUM

Exempel på hur man kan använda ANTHERIDIUM i en mening

• alt=Here is a diagram of antheridium structure in a liverwort, which is representative of most antheridia structures throughout species.
• Spores are monolete with the antheridium, or sporangium, containing either 32 or 64 sperm spores, usually being 64.
• The antheridia (or globules) and oogonia (or nucules) are protected by a layer of sterile cells when mature; the oogonium is oblong in shape and consists of a single egg, while the spherical antheridium is packed with threadlike cells that produce spermatia.
• It is a short-lived and inconspicuous heart-shaped structure typically 2–5 millimeters wide, with a number of rhizoids (root-like hairs) growing underneath, and the sex organs: archegonium (female) and antheridium (male).
• For example, the oomycete antheridium is a syncytium with many sperm nuclei and fertilization occurs via fertilization tubes growing from the antheridium and making contact with the egg cells.
• Oospores are made after the male gamete, antheridium, and female gamete, oogonium, undergo fertilization and then sexual recombination (meiosis).
• The teleomorph stage of the disease cycle does not occur in nature and involves sexual combination of the antheridium with the ascogonium to produce ascospores, allowing for genetic variation.
• Oospores serve as the primary form of inoculum, and can survive in the soil as long as seven years Oospores produced in the field can overwinter and when thawed produce an oogonium and antheridium which will then lead to the production of sporangia, oospores, and zoospores.
• The oogonium is in the shape of a circle that is connected to the hyphae and the antheridium looks like a branch of hyphae that connects to the oogonium to produce oospores.
• In the sexual state of Pythium graminicola an antheridium and an oogonium combine to make an oospore.
• Pythium voultum is usually fertilized by one antheridium, but has been observed being fertilized by as many as four antheridia at a time, which is different from other Pythia spp.
• Late in the year as the plant is dying cleistothecia will again form when the ascogonium receives the nucleus from the antheridium.
• In plants, for example, female sexual function is often more energetically expensive because once fertilized they must use significant stored energy to produce fruits, seeds, or sporophytes whereas males must only produce sperm (and sperm-containing structure; antheridium in seedless plants, and pollen in seed plants).
• Phytophthora capsici produces both a male and a female type gametangia called an antheridium (male) and an oogonium (female).
• In sexual reproduction, if multiple mating types are present, hyphal antheridium can contact each other and undergo plasmogamy, merging their membranes near the end of growing season.
• The sex organs are a multicellular and jacketed globule or antheridium (male) and nucule or archegonium (female).
• The presence of a gametophore bearing both an antheridium and an oogonium is considered a derived character state that evolved once in the ancestral Vaucheria.
• In this stage the antheridium fertilizes the haploid egg within the archegonia with haploid sperm producing a diploid zygote.
• The penetration of an oogonium via an antheridium leads to the formation of a sexual spore or an oospore.
• This part of the life cycle consists of protonema (the preliminary stage where the propagule develops green thread-like filaments), the rhizoids (filaments growing beneath the bryophyte that help anchor the bryophyte to its substratum), the stem, the leaves, its reproductive structure (archegonium in female plants, antheridium in male plants), and the calyptra (a thin tissue that forms from the venter of an archegonium and protects the sporangium as it develops).

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