Plants and the person. The summary

you are: Plants and the person

Cultivation of plants has allowed the person to pass from a nomadic way of life to settled, to reduce the area, necessary to support one person, and to increase the number. The subsequent increase of efficiency of plants was provided with selection, hybridization, application of fertilizers, an artificial irrigation, creation of pesticides and chemical regulators of growth. ' Green revolution ' has not justified hopes assigned to it owing to unforeseen difficulties, in particular rise in prices for energy sources and small suitability of soils in tropical and droughty areas.

Besides habitual methods of hybridization the modern selector can take advantage for improvement of vegetative cultures by methods of molecular genetics. Their number concern introduction in a vegetative cage of the new genetic information with the help plazmid, selection of new types from the isolated protolayers and somatic hybridization of protolayers. persons are grown up for the needs only by a small number of plants, and meanwhile there is a set still not studied plants which could be used widely. Number of the most promising kinds concern gvajula, giving rubber, hohoba, giving wax and oil, Echinochloa, grown up on grain, and sparzhevyj the peas used for reception of vegetative fiber. New methods of cultivation of plants with application of fabric cultures and adjustable reproduction can be useful as well in forestry.

Plants are harmed by pollution of atmosphere, soil and water, but they can help removal from the environment of some harmful substances. A human sewage which in the West countries simply throw out now, in the east subject to fermentation, and then use for soil fertilizer. this material is rich with mineral and organic substances, and therefore it is necessary to expect that it will be used more widely in agriculture in the West. Plants can serve also as food and be applied to clearing of environment in the closed systems, for example on spaceships; besides, they represent a possible source of renewed not food energy. The further progress substantially depends on continuation of scientific researches.