Hagino Kyoko, Bendif El Mahdi, Young Jeremy R, Kogame Kazuhiro, Probert Ian, Takano Yoshihito, Horiguchi Takeo, de Vargas Colomban, Okada Hisatake
Department of Natural History Sciences, Faculty of Science, Hokkaido University, Sapporo 060-0810, JapanCNRS UMR7144/UPMC, EPPO Team, Station Biologique de Roscoff, 29682 Roscoff, FrancePalaeontology Department, The Natural History Museum, London SW7 5BD, UKDepartment of Natural History Sciences, Faculty of Science, Hokkaido University, Sapporo 060-0810, JapanCNRS UMR7144/UPMC, EPPO Team, Station Biologique de Roscoff, 29682 Roscoff, FranceInstitute for East China Sea Research, Nagasaki University, 1-14 Bunkyo, Nagasaki 852-8521, JapanDepartment of Natural History Sciences, Faculty of Science, Hokkaido University, Sapporo 060-0810, JapanCNRS UMR7144/UPMC, EPPO Team, Station Biologique de Roscoff, 29682 Roscoff, FranceAdministrative Office, Hokkaido University, N8 W5 Kita-Ku, Sapporo, 060-0808 Japan.
J Phycol. 2011 Oct;47(5):1164-76. doi: 10.1111/j.1529-8817.2011.01053.x. Epub 2011 Sep 13.
Emiliania huxleyi (Lohmann) W. W. Hay et H. Mohler is a cosmopolitan coccolithophore occurring from tropical to subpolar waters and exhibiting variations in morphology of coccoliths possibly related to environmental conditions. We examined morphological characters of coccoliths and partial mitochondrial sequences of the cytochrome oxidase 1b (cox1b) through adenosine triphosphate synthase 4 (atp4) genes of 39 clonal E. huxleyi strains from the Atlantic and Pacific Oceans, Mediterranean Sea, and their adjacent seas. Based on the morphological study of culture strains by SEM, Type O, a new morphotype characterized by coccoliths with an open central area, was separated from existing morphotypes A, B, B/C, C, R, and var. corona, characterized by coccoliths with central area elements. Molecular phylogenetic studies revealed that E. huxleyi consists of at least two mitochondrial sequence groups with different temperature preferences/tolerances: a cool-water group occurring in subarctic North Atlantic and Pacific and a warm-water group occurring in the subtropical Atlantic and Pacific and in the Mediterranean Sea.
赫氏颗石藻（Emiliania huxleyi (Lohmann) W. W. Hay et H. Mohler）是一种分布于全球的颗石藻，生长在从热带到亚极地的水域中，其颗石形态可能因环境条件而有所变化。我们通过对来自大西洋、太平洋、地中海及其邻近海域的39株赫氏颗石藻克隆菌株的三磷酸腺苷合酶4（atp4）基因至细胞色素氧化酶1b（cox1b）基因，研究了颗石的形态特征和部分线粒体序列。基于扫描电子显微镜对培养菌株的形态学研究，O型是一种新的形态类型，其特征是颗石的中央区域开放，与现有的形态类型A、B、B/C、C、R和变种corona区分开来，后者的颗石具有中央区域元素。分子系统发育研究表明，赫氏颗石藻至少由两个具有不同温度偏好/耐受性的线粒体序列组组成：一个冷水组出现在亚北极的北大西洋和太平洋，一个温水组出现在亚热带的大西洋和太平洋以及地中海。
