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	[[Category:Developmental biology]]		[[Category:Developmental biology]]
	{{biology-stub}}		{{biology-stub}}
			== Primordium ==
			<gallery>
			File:Root_primordia.JPG\|Root primordia
			File:Primordia.png\|Primordia
			File:Thirdleaf.png\|Third leaf
			File:Generative_spiral.png\|Generative spiral
			File:Leaf_migration.png\|Leaf migration
			</gallery>

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'''Primordium''' is a biological term that refers to an organ or tissue in its earliest recognizable stage of development. Cells of the primordium are called [[stem cells]], and they are characterized by their ability to differentiate into a variety of different cell types.

== Development ==

The development of a primordium into a mature organ or tissue involves a process known as [[morphogenesis]]. This process is regulated by a variety of [[gene]]s and [[protein]]s, which control the growth and differentiation of cells in the primordium.

== Types of Primordia ==

There are several types of primordia, including:

* '''[[Leaf primordium]]''': This is the earliest stage in the development of a leaf. It is a small, cone-shaped structure that emerges from the [[apical meristem]], the growth point at the tip of a plant stem.

* '''[[Flower primordium]]''': This is the earliest stage in the development of a flower. It is a small bud that emerges from the [[inflorescence meristem]], the growth point where flowers are produced.

* '''[[Root primordium]]''': This is the earliest stage in the development of a root. It is a small, round structure that emerges from the [[root apical meristem]], the growth point at the tip of a root.

== Role in Plant Development ==

In plants, primordia play a crucial role in the process of [[organogenesis]], the formation of new organs. The development of primordia is regulated by a variety of [[plant hormones]], including [[auxin]], [[cytokinin]], and [[gibberellin]].

== Role in Animal Development ==

In animals, primordia are involved in the development of various organs and tissues, including the [[nervous system]], [[muscular system]], and [[circulatory system]]. The development of these primordia is regulated by a variety of [[growth factors]], including [[fibroblast growth factor]], [[transforming growth factor beta]], and [[vascular endothelial growth factor]].

== See Also ==

* [[Meristem]]
* [[Organogenesis]]
* [[Morphogenesis]]
* [[Stem cell]]

[[Category:Biology]]
[[Category:Developmental biology]]
{{biology-stub}}

Primordium - Revision history

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