The Leucoplaste S represent a category of Plaste S, Organite S specific of the vegetable cells. Contrary to other plastids such as the Chloroplast S or the Chromoplaste S, they are not pigmented.

Not having pigments, the leucoplasts are not green, which suggests a localization in the Racine S and photosynthetic fabrics not . They can specialize to store starch reserves, lipids or proteins, they then are respectively called Amyloplaste S, Oléoplaste S, or Protéinoplaste S. Cependant, in many cellular types, the leucoplasts do not occupy a function of storage, but are implied in many reactions of essential Biosynthèse, such as the synthesis of fatty-acids, many amino-acids, and of made up tetrapyrroles like the Hème S. In general, the leucoplasts are of size lower than the Chloroplaste S and take varied forms, often described like amiboïdes. Dense networks of Stromule S connecting the leucoplasts were observed in the épidermiques cells of the Racine S, the Hypocotyle S and the Pétale S, like in Call S and cellular suspensions of cultures of Tabac. In certain cellular types and at certain developmental stages, the leucoplasts are gathered around the core with stromules which extend towards the cellular periphery, as observed for the Proplaste S in the Méristème racinaires.

The étioplaste S, which are immature or étiolés Chloroplaste S for lack of light, do not contain active pigments and can thus be regarded as the shape of leucoplasts. After an exposure in the light of a few minutes, the étioplastes specialize in functional chloroplasts and cease being leucoplasts.

They differ from reversible manner starting from the proplastes.

Comparison

• Plastid
• Chloroplast and étioplaste
• Chromoplaste
• Leucoplast
• Amyloplaste
• Statolithe
• Oléoplastes
• Protéinoplaste

External bonds

• Stromules: characteristic concealment-specific feature off plastid morphology has. : An anglophone review concerning the Stromule S (the access is unfortunately limited to adhering)

References

• Henri Camefort, Morphology of the vascular plants: cytologie.anatomie.adaptations , Doin, 1996, 2nd ED. (the 7th pulling), 432 p., p.32-49
• {{pdf}} course of DEUG on line.