Dolven Jane K, Lindqvist Charlotte, Albert Victor A, Bjørklund Kjell R, Yuasa Tomoko, Takahashi Osamu, Mayama Shigeki
Natural History Museum, University of Oslo, P.O. Box 1172, Blindern, 0318 Oslo, Norway.
Protist. 2007 Jan;158(1):65-76. doi: 10.1016/j.protis.2006.07.004. Epub 2006 Nov 3.
Seven species of polycystine radiolarians and one phaeodarian species were investigated in order to determine the diversity of their associate organisms and their species specificity. Twelve partial 18S ribosomal DNA (rDNA) sequences were obtained showing a high diversity of associates, both within spumellarian and nassellarian radiolarians and among species. Two of the sequences obtained are highly similar to Scrippsiella, a dinoflagellate genus already reported as a symbiont of polycystine radiolarians. Nine of the new 18S rDNA sequences group with various alveolates. Some of these groups include parasites, such as the lethal endoparasite Amoebophrya, while others consist of non-annotated novel organisms found worldwide in various types of marine environments. We also obtained a sequence from a bacillariophytan highly similar to the 18S rDNA of the diatom species Diatoma tenue, which may derive from radiolarian food. Additionally, this is the first study to report on a phaeodarian associate.
为了确定多囊放射虫及其共生生物的多样性和物种特异性，对七种多囊放射虫和一种褐囊放射虫进行了研究。获得了12个部分18S核糖体DNA（rDNA）序列，这些序列显示出共生生物的高度多样性，无论是在泡沫虫类和罩笼虫类放射虫内部还是在物种之间。获得的两个序列与斯克里普藻属高度相似，斯克里普藻属是一种已被报道为多囊放射虫共生体的甲藻属。九个新的18S rDNA序列与各种有孔虫类归为一组。其中一些组包括寄生虫，如致命的内寄生性阿米巴藻，而其他组则由在世界各地各种海洋环境中发现的未注释的新生物组成。我们还从一种硅藻植物中获得了一个与硅藻物种纤细角毛藻的18S rDNA高度相似的序列，该序列可能来自放射虫的食物。此外，这是首次关于褐囊放射虫共生体的研究报告。
