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Leaves are the power plants of green plants and next to the roots the most important nutritional organs. At the Rebstock they form like that eyes (Summer and winter eyes), tendrils and inflorescences (Notes or later grapes) as lateral outgrowth on the Nodien (Knot) young growing shoots, As the shoot tip grows in length, new leaves branch off constantly, which develop according to a species- and variety-specific blueprint. With the help of leaf pigments like chlorophylls. carotenoids and flavonoids the light energy of the sun is absorbed by the leaves and during the photosynthesis under the use of carbon dioxide and water in high-energy glucose (Glucose) and oxygen transformed. The necessary carbon dioxide from the air through the stomata (Stomata) mostly taken on the undersides of leaves. Through these small stomata escapes the daytime produced oxygen to the outside.

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