Chromoplaste
A Chromoplaste is a Organite which one meets in the vegetable cells constituting the Organe S coloured of yellow to orange (for example cells of Pétale S of Fleur S). The change of color during the ripening of the sweet pepper and tomato fruits results from a transformation from the chloroplasts into chromoplastes in the cell S from the pericarp from the fruit.
These organoids can derive from the Chloroplaste S or the Proplaste S and are rich in Pigment S not chlorophyllian, like the Xanthophylle S, the Carotène S, etc
They do not have any metabolic role. One speaks about Coévolution between the plant and the Insecte, the color of the plant (due to the chromoplastes) attracts the insect which generally nourishes nectar, and " in return " pollinate the plant.
There exist 4 principal types of chromoplastes: the globular ones, the tubular ones, critallins (rare) and the membrane ones.
Attention, the color of the petals is sometimes due to the presence of pigments (in particular of the Anthocyanes) in the Vacuole, and not in chromoplastes.
There exist exceptional cases of the reconversion of chromoplastes in chloroplasts or proplastes.
Comparison
Proplaste- Plastid
- Chloroplast and étioplaste
- Chromoplaste
- Leucoplast
- Amyloplaste
- Statolithe
- Oléoplaste
- Protéinoplaste
Related articles
- Pigment
- Carotene
- Anthocyanine
- Xanthophyll
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.
| Random links: | Louis Mountbatten, 1st count Mountbatten of Burma | Erinaceinae | Subalpine stage | Tambov | Buffy against Dracula | Fleuve_Westbourne |