gametangia

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gametangium

WordNet

1. cell or organ in which gametes develop

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出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2012/08/28 22:58:54」(JST)

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A gametangium (plural: gametangia) is an organ or cell in which gametes are produced that is found in many multicellular protists, algae, fungi, and the gametophytes of plants. In contrast to gametogenesis in animals, a gametangium is a haploid structure and formation of gametes does not involve meiosis.

Types of gametangia

Depending on the type of gamete produced in a gametangium, several types can be distinguished.

Female

Main articles: Archegonium and Oogonium

Female gametangia are most commonly called archegonia. They produce egg cells and are the sites for fertilization. Archegonia are common in algae and primitive plants as well as gymnosperms. In flowering plants, they are replaced by the embryo sac inside the ovule.

Male

Main article: Antheridium

The male gametangia are most commonly called antheridia. They produce sperm cells that they release for fertilization. Antheridia producing non-motile sperm (spermatia) are called spermatangia. Some antheridia do not release their sperm. 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. Antheridia are common in the gametophytes in "lower" plants such as bryophytes, ferns, cycads and ginkgo. In "higher" plants such as conifers and flowering plants, they are replaced by pollen grains.

Isogamous

In isogamy, the gametes look alike and cannot be classified into "male" or "female." For example, in zygomycetes, two gametangia (single cells at the end of hyphae) form upon contact with each other and fuse into a zygospore.

English Journal

• Morphological examination and phylogenetic analyses of Phycopeltis spp. (Trentepohliales, Ulvophyceae) from Tropical China.

• Zhu H1, Zhao Z1, Xia S2, Hu Z3, Liu G3.
• PloS one.PLoS One.2015 Feb 2;10(2):e0114936. doi: 10.1371/journal.pone.0114936. eCollection 2015.
• During an investigation of Trentepohliales (Ulvophyceae) from tropical areas in China, four species of the genus Phycopeltis were identified: Phycopeltis aurea, P. epiphyton, P. flabellata and P. prostrata. The morphological characteristics of both young and adult thalli were observed and compared.
• PMID 25643363

• Coexistence of congeneric native and invasive species: the case of the green algae Codium spp. in northwestern Spain.

• Rojo I1, Olabarria C2, Santamaria M3, Provan J4, Gallardo T5, Viejo RM3.
• Marine environmental research.Mar Environ Res.2014 Oct;101:135-44. doi: 10.1016/j.marenvres.2014.09.006. Epub 2014 Sep 30.
• We examined the patterns of distribution and abundance, and reproductive traits (presence of gametophytes and size at time of reproduction) in the invasive Codium fragile ssp. fragile and the native C. tomentosum and C. vermilara on intertidal habitats of NW Spain at two dates. All three species c
• PMID 25440783

• Eight types of stem cells in the life cycle of the moss Physcomitrella patens.

• Kofuji R1, Hasebe M2.
• Current opinion in plant biology.Curr Opin Plant Biol.2014 Feb;17:13-21. doi: 10.1016/j.pbi.2013.10.007. Epub 2013 Nov 16.
• Stem cells self-renew and produce cells that differentiate to become the source of the plant body. The moss Physcomitrella patens forms eight types of stem cells during its life cycle and serves as a useful model in which to explore the evolution of such cells. The common ancestor of land plants is
• PMID 24507489

Japanese Journal

• 紅藻オキチモズクの体構造と生殖器官

• 吉崎 誠
• Bulletin of the National Science Museum. Series B, Botany 30(2), 55-62, 2004-06
• … Detailed morphological studies have been carried out on the vegetative thallus, gametangia and carposporophytes of Nemalionopsis tortuosa Yagi et Yoneda collected from southern Japan. …
• NAID 110004702114

• 海産緑藻ハゴロモ(ハネモ目)の有性生殖器官

• 北山 太樹
• Bulletin of the National Science Museum. Series B, Botany 29(4), 153-156, 2003-12
• … The presumed gametangia are long cylindrical, 1.2-3.2mm in length, 100-230μm in diameter. …
• NAID 110004702108

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• Gametangia? | ChaCha

Gametangia? ChaCha Answer: The male gametangia are most commonly called antheridia. They produce sperm cells that they release for fe... ... 7 months ago The male gametangia are most commonly called antheridia. They ...

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