Abstract

An endosymbiotic dinoflagellate isolated from the soft coral Stichodactyla haddoni from the coast of Hormuz Island, Strait of Hormuz, Persian Gulf, has been characterized morphologically for the first time. Spherical and egg-shaped cells 6–13 μm in diameter (8–13 μm during mitosis) were recorded. Transmission electron microscopy showed the presence of intracellular organelles including a nucleus, a mitochondrion, chloroplasts, a pyrenoid, calcium oxalate crystals, starch granules, lipid droplets, and cell periplast. Abundant stored substances such as starch and fat droplets, as well as the calcium oxalate crystals, in the studied species were a response to the harsh environmental conditions (high salinity and temperature). The composition and arrangement of the intracellular organelles in Symbiodinium cells led to the conclusion that the studied dinoflagellate was cytologically very close to Symbiodinium goreaui Trench & Blank (clade C). In contrast to previous records, chloroplasts were widely dispersed throughout the cell. A molecular analysis has confirmed that the endosymbiotic dinoflagellate identified as S. goreaui is a member of clade C of the genus Symbiodinium. It is the first record of a symbiont species coexisting with marine invertebrates on the Iranian coast of the Persian Gulf.

中文翻译：

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从霍尔木兹海峡霍尔木兹岛海岸采集的软珊瑚Stichodactyla haddoni Saville-Kent的鞭毛鞭毛内生菌

摘要

从波斯湾霍尔木兹海峡霍尔木兹岛海岸的软珊瑚Stichodactyla haddoni分离出的内共生地鞭毛藻已经首次进行了形态学表征。直径为6-13μm的球形和卵形细胞（有丝分裂期间为8-13μm）被记录下来。透射电子显微镜显示细胞内细胞器的存在，包括细胞核，线粒体，叶绿体，类胡萝卜素，草酸钙晶体，淀粉颗粒，脂质滴和细胞包膜。在所研究的物种中，大量存储的物质（例如淀粉和脂肪滴以及草酸钙晶体）是对恶劣环境条件（高盐度和高温）的反应。胞内细胞器的组成和排列。共生菌素细胞得出的结论是，所研究的鞭毛鞭毛虫在细胞学上非常接近共生菌藻Trench＆Blank（C进化枝）。与以前的记录相反，叶绿体广泛分布在整个细胞中。的分子分析已经确认鉴定为内共生甲藻S. goreaui是属进化枝C的成员共生。这是波斯湾伊朗海岸上与海洋无脊椎动物共存的共生物种的第一个记录。