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aref2 The depletion of ozone layer can result in increasing the intensity of ultraviolet emission (UVE). The study to discover the biological exposure of UVE to natural phytocoenoses and agricultural crops has been conducted since the 1950's. The similar experiments are methodically justified to be done in field conditions but not in conditions of frame area. As found, UVE influences a plant at every level of its organization, in particular, causes morphophysiological changes, alters the hormonal status, induces DNA injuries. The UVE sensitivity greatly depends on an ontogenesis genotype and stage. Usually in studies a concept of biologically effective UVE is used allowing thereby comparing dependencies between a dose and effect for solar and artificial UVE. In the modern experiments it is shown that the contribution of region A UVE to the total biological effect was earlier undervalued. The earlier calculations mainly involved UVE exposure in region B. The simulation of the depletion of ozone layer predicted a great loss of yields pf some agricultural crops - up to 50%. With reference to the newly received data, the loss can be even greater, as the spectral composition of lampas used in these experiments simulated the depletion of ozone layer not 30% as supposed, but only 8%. However, the mutagenic activity of UVE is really determined by the exposure of primarily region B rays. According to the recommendations of the International Commission on Illumination (CIE), the spectral sensitivity of biological tissues and a detector used in the experiment to a UVE wavelength should fit together. It has been concluded that the methodology of simulating the UVE exposure to plants is extremely important for adequate prediction of the yield loss and needs improving

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