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《Periodical of Ocean University of China》 2010-S1
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Effects of Nutrient Concentration Changes on Growth,Biochemical Compositions and Physiology of Gracilaria lichenoides and G.tenuistipitata var.liui

JIANG Wen-Wen,TIAN Xiagn-Li,DONG Shuang-Lin,WANG Qing-Lin,LI Ying(Key Laboratory of Mariculture,Ministry of Education,Ocean University of China,Qingdao 266003,China)  
Effects of nutrient concentration changes on growth,biochemical compositions and physiology of Gracilaria lichenoides and G.tenuistipitata var.liui were compared under the conditions of laboratory.The results showed that different forms of nutrient concentration changes have different impacts on growth,content of PE,chlorophyll-a,total carbon,total nitrogen,NR activities and CAT activities of the two species of Gracilariae.Gracilaria lichenoides expressed the best growth in the middle concentration of nutrient.G.tenuistipitata var.liui expressed different growth which depends on the concentration of nutrient in the preliminary environment.Generally,the content of PE,chlorophyll-a,total carbon,total nitrogen and NR activities of the two species of Gracilariae would be increased when the nutrient concentration changed from 3 μmol/L to 45 μmol/L and 150 μmol/L.However,when the nutrient concentration changed from 45 μmol/L and 150 μmol/L to 3 μmol/L those data mentioned above would decline.It had no effects to the NR activities of the two species of Gracilariae when the nutrient concentration mutually changes from 45 μmol/L to 150 μmol/L.The activities of CAT would decline dramatically as the concentration of inorganic nitrogen increases.When the nutrient concentration changed from 3 μmol/L to 150 μmol/L,the CAT activities of the two species of Gracilariae declined dramatically.Oppositely,when the nutrient concentration changed from 150 μmol/L to 3 μmol/L,it's activities would increased somewhat.Comprehensive comparison showed that G.tenuistipitata var.liui was much susceptible to be influenced by the nutrient concentration changes in the environment,and it's adaptability of nutrient concentration changes may be lower than G.lichenoides.
【Fund】: 国家高技术研究发展计划课题(2006AA10Z409);; 国家十一五科技支撑计划课题(2006BAD09A01);; 新世纪优秀人才支持计划(NCET-08-0503)资助
【CateGory Index】: S917.3
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