Research Progress on Stress Effects of Increasing O3 Concentration Near the Ground on Plants
With the rapid development of industry,the concentration of ground-level ozone(O3)has increased significantly,which has caused a negative impact on plant growth and physiological conditions that can't be ignored.After several days of exposure in an O3 concentration of 60 nmol/mol,O3-sensitive plants will show varying degrees of leaf damage.When the concentration of O3 exceeds 80 nmol/mol,it will adversely affect the physiological and ecological indicators of most plants.The effects of high concentration O3 environment on plant stress were summarized as the following:The plant photosynthesis was affected and the photosynthetic rate was reduced;the membrane permeability of plants was changed:the content of malondialdehyde(MDA)increased,and electrolyte exosmosed;the contents of soluble protein,amino acid and soluble carbohydrate were changed.The plant enzyme activity system is affected:The activities of peroxidase(POD),superoxide dismutase(SOD),catalase(CAT)and ascorbate peroxidase(APX)in plants can be affected.
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