The Multiplication, Growth And Absorb N, P Nutrients Of Ulva Pertusa Kjellman To The Enhanced UV-B Radiation

The chlorofluorocarbons(CFCs) is increasing with industrialization,and the increasing of these trace gases is expected to deplete the stratospheric ozone layer with a subsequent increase in the amount of solar UV-B radiation reaching the earth.Not only marine organisms but also marine ecosystem can be affected by enhanced UV-B radiation.Ulva pertusa Kjellman lives in the intertidal and the shallow water of nearshore, so it is bound to be impacted by the enhanced UV-B radiation.For comprehensive understanding the effects of increasing UV-B radiation, on the multiplication and growth of Ulva pertusa Kjellman,the physiological and biochemical response of Ulva pertusa Kjellman to UV-B radiation and absorbtion N,P nutrients to enhanced UV-B radiation were studied in the laboratory based on the the method of experimental ecology and biochemistry.The results shown that UV-B radiation significantly inhibited the spores attachment, germination and death. Ulva pertusa Kjellman seedling appearances were mainly characterized by rod shape and tadpole shape. The percentage of rod shape was 90.68%±2.5%. UV-B radiation could inhibit the growth of Ulva pertusa Kjellman seedling, and the growth inhibition was more significant with the increased doses of UV-B radiation treatment. On the day 30, Ulva pertusa Kjellman seedling had emerged death under UV-B radiation, and the death rate was increased with the increased doses of UV-B radiation treatment. It speculated that the reasons of Ulva pertusa Kjellman seedling growth inhibition and death were excess ROS, which produced by UV-B radiation.UV-B radiation could inhibit the growth of Ulva pertusa Kjellman, and the effects on the physiological and biochemical characteristics were obvious both on younger and adult Ulva pertusa Kjellman.The souble protrin of adult Ulva pertusa Kjellman is not obvious, It increased by 1.46% under 30.96J·m-2·d-1 radiation and 4.69% under 61.92J·m-2·d-1compared with the control group,while the radiation is 123.84J·m-2·d-1 it showed a deased trend; SOD activity was significantly higher than the control group,SOD activity and CAT activity showed the maximum under 30.96J·m-2·d-1,,but CAT activity showed deceased trend under 61.92J·m-2·d-1 and 123.84J·m-2·d-1, when the UV-B radiatin dose increased, The content of chlorophyll-a and carotenoids are also shown a downward trend. Effect of UV-B radiation on younger Ulva pertusa Kjellman was different from adlult Ulva pertusa Kjellman. The content of Soluble protein and SOD activity showed an increased under UV-B radiation, while CAT activity and the content of carotenoids were lower than the control group;However the content of Chl-a showed an obviously increased as the dose of 30.96J·m-2·d-1.The response of Ulva pertusa Kjellman absorbed N, P nutrients to UV-B radiation with method of biomimicry. The results indicated that the ability of Ulva pertusa Kjellman absorbing N, P nutrients were inhibited under UV-B radiation treatment.