In Botanical and vegetable Physiology, the sap is the liquid medium which circulates thanks to specialized cells called “vessels”, between different the Organe S from the Plante S to transport the nutritive elements necessary to their growth and to redistribute the Substance S organics worked out by the Photosynthèse.
Crude sapThe crude sap , solution of Rock salt, absorptive on the level of the roots by the hairs absorbents (Rootlet S), circulates mainly in the Xylème, i.e. the vessels of wood. In the trunk of the Tree S, the active vessels are in the Aubier (which is the peripheral part of wood, those of the center (the Duramen) having died and playing only one part of support thanks to the Lignine. The rise of the crude sap can largely exceed, in the very large trees, the 10 m height which would be the limit of a simple syphoning by the top. That is explained mainly by the phenomenon of Osmose allowing the transfer of liquids of different concentrations through semipermeable membranes (those of the cells).
Elaborate sapThe elaborate sap , which contains soluble organic substances, mainly amino-acid and Sucre S, comes primarily from the Feuille S, seat of the Photosynthèse, and circulates mainly in the Phloème, conducting fabric of the Liber, located right under the bark. The exchanges are made also sheets towards the bodies of reserves or bodies well, Fruit S, Graine S, Tubercule S, or contrary in period of growth, of the bodies of reserves towards the Tige S in formation. N.B: it is rare that there are flows of sap between the fruits and the other bodies of the plant because the fruits are essential elements for the dispersion of seeds and thus the perenniality of the species; they thus are very protected.
UseThe elaborate sap is sometimes taken by the man who in the car of the sweetened products, sap of Bouleau, sap of the Palmier to sugar (which provides the Palm wine)… Contrary to a spread idea, the Maple syrup, produced sweetened, is not drawn from the elaborate sap but well of the crude sap of the Maple, which, in spring, takes care of sugars resulting from fabrics from parenchymatous reserves, before even as photosynthesis its activity did not begin again.
- vegetable Histology
- , English sap,
|Random links:||Busserolles | Pierre Hébert (scenario writer) | Mickaël Etcheverria | To bind (Norway) | Iskrovci | Lahore|