广西科学院学报Issue(3)：219-227,9.
硝氮和紫外辐射对龙须菜碳氮利用的影响
Effects of Ultraviolet Radiation and Different Nitrate Concentration on Carbon and Nitrogen Utilization of Gracilaria lemaneiformis Grown
摘要
Abstract
Objective ]To investigate carbon and nitrogen utilization of Gracilaria lemaneiformis responding to ultraviolet radiation (UVR),and reveal the regulation of avail-able nitrogen in this process.[Methods]Two nitrate treatments with different concentration (L-N,50 μmol·L-1 and H-N,500 μmol·L-1 )and three radiation treatments with different without UVR.UVR exposure decreased the maximal photosynthetic carbon fixation rate (P max )and semi saturation constant of carbon utilization (K DIC ),while raised carbonic anhy-drase (CA)activity in alga.Compared to L-N condition,both P max and CA activity in-creased,and K DIC decreased significantly in thalli cultured in H-N condition.[Conclusion]These results suggested that UVR exposure stimulated nitrogen uptake and inhibited carbon utilization in Gracilaria lemaneiformis .However enrichment of available nitrogen could al-leviate the inhibition on photosynthetic carbon fixation caused by UVR exposure.关键词
龙须菜/紫外辐射/硝氮/氮利用/碳利用Key words
Gracilaria lemaneiformis/UVR/nitrate/nitrogen utilization/carbon utilization分类
海洋科学引用本文复制引用
徐智广,朱安成,吴海一..硝氮和紫外辐射对龙须菜碳氮利用的影响[J].广西科学院学报,2015,(3):219-227,9.基金项目
国家自然科学基金项目(41376129),海洋公益性行业科研专项经费项目(201305005,201305021),山东半岛近岸海域生态模拟实验研究项目,青岛市市南区科技发展资金项目(2013-12-005-SW)和山东省海洋生物研究院院长基金项目(SZJJ201304)资助。 （41376129）
