primordium

• n.

• 原基

redirect 原基

関

anlage、anlagen、germ、placode、primordia

　

WordNet

1. an organ in its earliest stage of development; the foundation for subsequent development (同)anlage
2. the elementary stages of any subject (usually plural); "he mastered only the rudiments of geometry" (同)first rudiment, first principle, alphabet, ABC, ABC''s, ABCs
3. the remains of a body part that was functional at an earlier stage of life; "Meckels diverticulum is the rudiment of the embryonic yolk sac"
4. a small apparently simple structure (as a fertilized egg) from which new tissue can develop into a complete organism

PrepTutorEJDIC

1. 《the rudiments》(…の)初歩,基本,原理《+『of』+『名』》 / 《the rudiments》(…の)きざし,茅ばえ,初期《+『of』+『名』》 / 〈C〉(生物の)痕跡器官,退化器官
2. 細菌,ばい菌 / (植物の)胚(はい),幼芽;(動物の)卵子 / 原因;(発達の)初期

Wikipedia preview

出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2015/11/30 05:11:43」(JST)

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[Wiki en表示]

"Primordia" redirects here. For the video game, see Primordia (video game).

Root primordia (brown spots) as seen on the butt of a freshly cut pineapple crown intended for vegetative reproduction.

A primordium (/praɪˈmɔːrdiːəm/; plural: primordia) in embryology, is defined as an organ or tissue in its earliest recognizable stage of development. Cells of the primordium are called primordial cells. A primordium is the simplest set of cells capable of triggering growth of the would-to-be organ and the initial foundation from which an organ is able to grow.

Although it is frequently used term in plant biology, the terminology is used in biology of all multicellular organisms (for example: primordium of tooth in animals, primordium of leaf in plants or primordium of sporophore in mushroom.)

Primordium development in plants

Plants produce both leaf and flower primordia cells at the shoot apical meristem (SAM). Primordia developments in plants is critical to the proper positioning and development of plant organs. The process of primordia development is intricately regulated by a set of genes that affect the positioning, growth and differentiation of the primordium. Genes like the STM (shoot meristem less) and CUC (cup-shaped cotyledon) are involved in defining the borders of the newly formed primordium.

The plant hormone auxin has also been implicated in this process, with the new primordia being initiated at the placenta where the auxin concentration is the highest. There is still much to understand about the genes involved in primordia development.

Leaf primordia are a group of cells that will form into new leaves. These new leaves form near the top of the shoot and resemble knobby outgrowths or inverted cones. Flower primordia are the little buds we see at the end of stems, from which a flower will develop. Flower primordia start off as a crease or indentation and later form into a bulge. This bulging is caused by slower and less anisotropic, or directionally dependent, growth. (See anisotropy)

References

See also

• Anlage
• Morphogenesis
• Primordial phallus

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★リンクテーブル★

リンク元	「germ」「プラコード」「原基」「anlage」「anlagen」
拡張検索	「cardiac primordium」「cerebellar primordium」「cartilage primordium」「eye primordium」

「germ」

　　[★]

• n.

• 微生物、(発生)胚、胚芽、原基

関

anlage、anlagen、embryo、embryonic、germinal、microbe、microbial、microorganism、placode、primordia、primordium

　 　

「プラコード」

　　[★]

英

placode

• 胎児器官の原基を形成する外胚葉の肥厚

• ex. lens placode 水晶体板

• 肥厚板、原基

関

anlage、anlagen、germ、primordia、primordium

「原基」

　　[★]

英

placode, germ, primordium, anlage、primordia、anlagen, rudiment

関

胚、肥厚板、微生物、プラコード、胚芽

「anlage」

　　[★]

原基

関

anlagen、germ、placode、primordia、primordium

「anlagen」

　　[★]

原基

関

anlage、germ、placode、primordia、primordium

「cardiac primordium」

　　[★]

• 心臓原基、心原基

関

cardiac primordia

「cerebellar primordium」

　　[★]

小脳原基

関

cerebellar primordia

「cartilage primordium」

　　[★]

• 軟骨原基

関

cartilage primordia

「eye primordium」

　　[★]

• 眼原基

関

eye primordia