Mechanisms of photoadaptation in three strains of the symbiotic dinoflagellate Symbiodinium microadriaticum
Mechanisms of photoadaptation in three strains of the symbiotic dinoflagellate Symbiodinium microadriaticum
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共生甲藻共生藻（Symbiodinium microadriaticum）三种菌株的光适应机制
DOI：
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发表时间：
1983
期刊：
影响因子：
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通讯作者：
R. Trench
中科院分区：
文献类型：
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作者：
S. Chang;B. Prézelin;R. Trench
本文研究了三株共生甲藻Symbiodiniummicroadriaticum光合作用的光适应机制。将从蛤Tridacna maxima、海葵Aiptasia pulchella和石珊瑚Montipora verrucosa中分离的藻类菌株保持在确定的培养基ASP-8A中，并在26°C、14 h：10 h（光：暗）光周期、22至248 μE m-2 s-1的辐照度下生长。在生长的对数期期间分析所有藻类培养物。在所有光照水平下，测定细胞分裂和光合作用的速率，以及细胞体积、色素（包括叶绿素a、叶绿素c2、多甲藻素、β-胡萝卜素和叶黄素）以及碳和氮含量。低光诱导的色素沉着的变化是明显的，在不同程度上，在所有三个藻株，虽然在光合作用辐照度的关系的改变是明显不同的，在每个菌株。从T.最大值显示出最小的光适应能力，并且似乎通过改变光合单位（PSU）的大小来光适应。藻类A. pulchella通过改变PSU数量来适应，而M.疣状珊瑚似乎通过改变CO2固定酶或电子传递系统的活性来适应光。这是第一次观察到不同菌株的S.微腺肌藻类的适应能力似乎与其各自宿主的生态分布密切相关。这项研究是从1981年7月到1982年12月进行的。
Mechanisms of photoadaptation of photosynthesis have been studied in three strains of the symbiotic dinoflagellate Symbiodinium microadriaticum. Algal strains isolated from the clam Tridacna maxima, the sea anemone Aiptasia pulchella, and the scleractinian coral Montipora verrucosa were maintained in the defined medium ASP-8A, and were grown at irradiances ranging from 22 to 248 μE m-2 s-1 on a 14 h:10 h (light:dark) photoperiod at 26°C. All algal cultures were analysed during log-phase of growth. At all light levels, rates of cell division and photosynthesis were determined, as were cell volumes, pigmentation (including chlorophyll a, chlorophyll c2, peridinin, β-carotene and xanthophylls), and carbon and nitrogen content. Low light-induced changes in pigmentation were evident to varying degrees in all three algal strains, although alterations in the photosynthesis-irradiance relations were distinctly different in each strain. The algae from T. maxima show the least photoadaptive capability, and seem to photoadapt by changing photosynthetic unit (PSU) size. Algae from A. pulchella appear to adapt by changing PSU number, while algae from M. verrucosa appear to photoadapt by changes in the activities of CO2-fixing enzymes or electron transport systems. These are the first observations that demonstrate functional differences in different strains of S. microadriaticum. The adaptive capabilities of the algae appear to correlate well with the ecological distribution of their respective hosts. The study was made from July 1981 through December 1982.