By Victoria V Roshchina, Valentina D. Roshchina
Ozone is a typical constituent of air yet this fuel turns into risky for dwelling organism while its focus within the troposphere is simply too excessive. so much past stories of this substance tested it basically in its position as an earth reveal for the biosphere or an air pollutant. This publication also will view its derivatives (active oxygen species) at a molecular and mobile point, as components that experience either optimistic and unwanted effects on plants. Plant cells may be regarded as either recipients and resources of ozone, in addition to attainable biosensors and bioindicators for high and low concentrations of the compound.
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Extra info for Ozone and Plant Cell
Example text
In the step reduction of oxygen, the intermediate forms of restored oxygen can play a certain role in oxidizing processes. 2). Below we separately consider each of the most important active oxygen species. 1. 6). :; ,. H02 At one-electronic reduction of superoxide anion radical, peroxidion will be formed, while protonation produces hydrogen peroxide 22 ATMOSPHERJC OZONE +2H o; ........ ~ 0. 22• ............ :;,. 6-2 Thus, superoxide anion radical can be formed both from the reduction of molecular oxygen and from the one-electron oxidation of hydrogen peroxide.
The oxidizing reactions in membranes also influence the concentration of cyclic nucleotides and, consequently, the sensitivity of cells to the hormonal action (Burlakova, 1981; Burlakova and Khrapova, 1985). As plasmatic membranes contain antioxidants inhibiting oxidative reactions, they appear to be active modifiers of the hormonal sensitivity of cells, like ozone and some of the products of ozone-related transformations. Thus, any change in membrane content, oxidative state or structure influences the hormonal regulation of cellular metabolisms.
Singlet oxygen reacts with alkenes to form o; can be a source of other compounds that generate hydroperoxides. Like ozone, radicals in vivo (Larson, 1978). 6. , 1997) need to be determined. Table 1 represents most significant values of ozone in the air. The increased concentrations of ozone in the surface air are observed only after thunder storms or in areas of high pollution. Ozone's characteristic odor is an indicator of enhanced amounts of 0 3 in air. Quantities higher than this minimum detectable by the nose are dangerous for the biosphere as a whole and for plants in particular.