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The plants form their own realm within the domain of the Eukaryoten. With them scientifically the discipline of the Botanik.Pflanzen is concerned lives - contrary to the heterotrophen animals and mushrooms - almost exclusively photoautotroph: That is, they place to growing and living necessary organic material ago with the help of the sunlight by photosynthesis (Phototrophie). They use as source of carbon excluding carbon dioxide (Autotrophie). Exceptions are some parasitische plants, which refer their food of other plants and in the course of the evolution its chlorophyll (chlorophyl) lost.
Historically the definition of the term changed itself plant. Thus today photosynthesis operating Prokaryonten is not ranked as for example the Cyanobakterien (Cyanobacteria) no more among the plants. This applies also to a whole set of Protisten kinds, for example the gold algae or brown algae. Also the mushrooms were originally also ranked among the plants, although one knows today that they are more near related to the animals. They are placed with the animals into their own realm (Opisthokonta).
Today one follows the phylogenetischen system, which groups the plants on the basis their descent systematically in biology almost exclusively. Therefore apply only the alga lines with Plastiden from primary Endosymbiose to the genuine plants (Plantae). In addition the (Chlorophyta) belong, the Streptophyta (contain the land plants, the decoration algae, the arm light ral gene and some further alga lines), the red algae (Rhodoplantae; after Saunders and Hommersand 2004) and probably also the Glaucocystophyceen. Chlorophyta and Streptophyta are summarized as Viridiplantae. All Viridiplantae contains chlorophyll A and chlorophyll b and stores the photo-synthetically produced sugars in the form of strength in the Chloroplasten.Die of cell walls of these organisms consists of cellulose.
Land plants often arise in characteristic groups, to the Pflanzengesellschaften in such a way specified. Plants can affect by delivery of allelopathischer materials other plants.
It is to be noted the fact that the partitioning is subjected in classes, departments of, etc. not only to a constant change but by ranks today also as disputed, established thereby, applies. In many places today on a struggleless taxonomy one works.
(Chlorophyta)
in the further sense and land plants (Streptophyta)
Cyanidiophyta
Rhodophyta
(after Saunders and Hommersand 2004)
With respect to its meaning for humans one differentiates between wild-increasing plants, among them also arbitrarily weeds so mentioned, and cultivated plants.
To that partly wildly, partly increasing useful plants counts one cultivates the welfare plants (see also list of the welfare plants) and the kitchen herbs (see also herbs). With spices it concerns usually dried kitchen herbs (see also list of the kitchen herbs and spices). Herbs for and teas are dried used both freshly and. Very frequently aromatic plants also only their smell are cultivated because of, as it with smelling flowers - in particular the roses - which is case.
Substanziell to be used also the usually intoxication-producing drug plants, which often rank among the poison plants.
Ornamental plants are cultivated against it for aesthetic reasons; most house plants belong into this category, neglect one in closed areas cultivated herbs.
Lengthens time applied for plants in its function as CO2-Vernichter and an oxygen producer as favorable environmental factors. A new study of franc Keppler of the Heidelberger institute for Max-Planck for nuclear physics according to they produce large quantities methane, which constitute 30% of the global methane output in their whole and so that to the climatic heating up contribute.
read on to: Researchers find completely unexpectedly high methane output with living plants (www.wissenschaft.de)
Despite the unknown methane missions from the plants, then however the scientists of the institute for Max-Planck for nuclear physics in a statement stress on the reactions to their publication the fact that the climaticecological advantage of the plants remains existing methane missions due to their by far higher connection potential for carbon dioxide compared with that further and therefore e.g. with afforestations and jungle protection for the climate is good. The scientists computed a methane release at a value of 0,25 to 1.0 gram for each bound kilogram at carbon dioxide. Even the consideration of a by far higher greenhouse potential of methane (approx. the 23fache in the comparison to the carbon dioxide) changes this relationship only insignificantly.
Result: Plant growth is further one of the most important and most economical possibilities of reducing gradually the carbon dioxide concentration in the atmosphere and of braking thus the climatic change at least. If one considers the enormous potentials for the climatic protection, which are offered from a lasting forestry with forest increase and wood use, still much too little is aufgeforstet and the raw material wood is not optimally used.
read on to: Global warming: plants acres emergency ton blame (www.scidev.net)
to recommend in addition: Internet portal to forest and climate (www.waldundklima.net)
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