生态环境2008，Vol.17Issue(5)：1748-1753,6.
海洋硅藻三角褐指藻经黑暗与UV辐射后的补偿生长
Compensatory growth in marine diatom Phaeodactylum tricornutum(Bacillariophyceae)after darkness and UV radiation
摘要
Abstract
Compensatory growth,which is refers to the exceptionally fast growth of individuals following a period of reduced growth resulting from suboptimal conditions,has been intensively studied in a wide range of ruminant animals,aquatic animals and higher plants.Up to now,howeveL there has been little information available on the compensatory growth in marine phytoplankton,the first primary producers in the marine environments and a natural resource containing a high content of bioactive compounds with many industrial applications,mainly because of their microscopic size and methodology limitation.In the present study,the compensatory growth of marine diatom Phaeodactylum tricornutum Was investigated after algal cells were exposed to different conditions of dark-ness and UV radiation by determining cell biomass,chlorophyll a content and protein content in the recovery stage.Our results indi-cared that the cell biomass of marine Phaeodactylum tricornutum microalga recovered from 0.1 min and 0.8 min radiation Was com-paratively higher than that without UV radiation through out the experiments,no matter in normal light treatment or 2-day darkness treatment.Besides,returning back to standardized growth condition after algal cells subjected to darkness treatment and UV radiation also tended to have a compensatory effect on the content of chlorophyll a and protein On some days.The results have provided the first demonstration that marine phytoplankton Phaeodactylum tricornutum which previously encountered various stresses of darkness and UV radiation showed compensatory growth if the stresses were relieved,and that the magnitude and duration of compensatory growth would depend on the variations of darkness and UV radiation from which the cells had formerly suffered.These findings ould not only contribute to an expanding data concerning the compensatory growth of plant species,but also provide theoretical and technological base for predicting of red tides or for commercial culture of marine microalgae.关键词
三角褐指藻/补偿生长/黑暗/UV辐射Key words
Phaeodactylum tricornutum/compensatory growth/darkness/UV radiation分类
环境科学引用本文复制引用
蔡卓平,危蔚,段舜山..海洋硅藻三角褐指藻经黑暗与UV辐射后的补偿生长[J].生态环境,2008,17(5):1748-1753,6.基金项目
国家自然科学基金项目(40876074,30770336) （40876074,30770336）
广东省科技计划重点引导项目(2005B33201001) （2005B33201001）
珠海市科技计划重大项目(PC20061045) This study was supposed by the National Natural Science Foundation of China(No.40876074 and No.30770336),the Guangdong Key Guiding Project of Science and Technology Planning (No.2005833201001)and the Zhuhai Science and Technology Planning Project Contract Research(No.PC20061045). （PC20061045）
