Primordium

Primordium

A primordium, in embryology, is defined as an organ or tissue in its earliest recognizable stage of development [ [http://www.medterms.com/script/main/art.asp?articlekey=33809 MedicineNet.com] ] . Cells of the primordium are called primordial cells.

A primordium can be considered the simplest set of initial conditions capable of triggering growth.Within any meristem are minute primordia that resemble knobby outgrowths or ribbed inverted cones.

Primordium development in plants

Primordial development in plants is critical to the proper positioning and development of plant organs. Different primordial types like the leaf and flower primordia arise from the shoot apical meristem. The process is intricately regulated by a set of genes that affect the positioning, growth and differentiation of the primordium.

The plant hormone auxin has also been implicated in this process, with the new primordia being initiated at the site where the auxin concentration is the highest. Genes like STM (shoot meristem less) and CUC (cup-shaped cotyledon) are involved in defining the borders of the newly formed primordium. [ [http://www.ncbi.nlm.nih.gov/sites/entrez?db=pubmed&uid=16271866&cmd=showdetailview&indexed=google Heisler et al, Patterns of auxin transport and gene expression during primordial development revealed by live imaging of the Arabidopsis inflorescence meristem, Current Biology, 2005, Vol. 15, pp 1899-1911] ]

References

ee also

*Anlage
*morphogenesis


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Look at other dictionaries:

  • primordium — primordium. См. примордий. (Источник: «Англо русский толковый словарь генетических терминов». Арефьев В.А., Лисовенко Л.А., Москва: Изд во ВНИРО, 1995 г.) …   Молекулярная биология и генетика. Толковый словарь.

  • Primordium — (lat.), so v.w. Ursprung; davon primordial, uranfänglich, ursprünglich …   Pierer's Universal-Lexikon

  • Primordĭum — (lat.), Ursprung, Anfang …   Meyers Großes Konversations-Lexikon

  • primordium — [prī môr′dē əm] n. pl. primordia [prī môr′dēə] [ModL < L: see PRIMORDIAL] Embryology the first recognizable aggregation of cells that will form a distinct organ or part of the embryo …   English World dictionary

  • Primordium — Un primordium (au pluriel primordia) est une ébauche d organe d une plante ou d un champignons (mycota). Le développement d un primordium aboutit à la formation de l organe. Sommaire 1 Botanique 2 Mycologie 3 Articles connexes …   Wikipédia en Français

  • primordium — /pruy mawr dee euhm/, n., pl. primordia / dee euh/. Embryol. the first recognizable, histologically differentiated stage in the development of an organ. [1665 75; < L primordium, in pl.: beginnings, elementary stage, equiv. to prim(us) first (see …   Universalium

  • primordium — An aggregation of cells in the embryo indicating the first trace of an organ or structure. SYN: anlage (1). [L. origin, fr. primus, first, + ordior, to begin] genital p. ovoid clump of cells seen in the rhabditiform larvae of Strongyloides …   Medical dictionary

  • primordium — pri•mor•di•um [[t]praɪˈmɔr di əm[/t]] n. pl. di•a [[t] di ə[/t]] dvl the first recognizable, histologically differentiated stage in the development of an organ • Etymology: 1665–75; < L prīmōrdium, in pl.: beginnings, elementary stage… …   From formal English to slang

  • Primordium — užuomazga statusas T sritis gyvūnų raida, augimas, ontogenezė, embriologija atitikmenys: lot. Primordium ryšiai: platesnis terminas – organogenezė …   Veterinarinės anatomijos, histologijos ir embriologijos terminai

  • Primordium — užuomazga statusas T sritis embriologija atitikmenys: lot. Primordium ryšiai: platesnis terminas – gemalas …   Medicininės histologijos ir embriologijos vardynas

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