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首页> 外文期刊>Coral reefs: journal of the International Society for Reef Studies >Coral disease physiology: the impact of Acroporid white syndrome on Symbiodinium
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Coral disease physiology: the impact of Acroporid white syndrome on Symbiodinium

机译：珊瑚病生理：顶体白综合征对共生菌的影响

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Acroporid white syndrome, a disease-like syndrome from the Great Barrier Reef, results from degenerative host tissue at lesion borders. Tissue preceding lesion borders appears visually healthy, but it is currently unclear whether the endosymbiotic zooxanthellae (Symbiodinium) are physiologically impacted. Compared to healthy colonies, this study found no significant differences in symbiont density, mitotic index or chlorophyll a content in tissue bordering (0 cm), and 8 cm away from white syndrome lesions. Using chlorophyll a fluorescence techniques, the border tissue did not appear to be photosynthetically compromised, and Symbiodinium extracted from this area were photosynthetically competent. Transmission electron microscopy revealed extensive degeneration of host tissues surrounding symbionts in affected areas, however, Symbiodinium cells were structurally intact with no sign of in situ degradation. Collectively, these results suggest that Symbiodinium at white syndrome lesion borders exist in a dynamic intra-cellular state during active host tissue loss, yet remain physiologically uncompromised.
机译：Acroporid White综合征是大堡礁的一种类似疾病的综合征，是由病变边界处的宿主组织退化引起的。病变边界之前的组织在视觉上看起来很健康，但是目前尚不清楚内共生虫黄藻（Symbiodinium）是否在生理上受到影响。与健康菌落相比，这项研究发现组织边界（0 cm）和距白色综合征病变8 cm处的共生体密度，有丝分裂指数或叶绿素a含量无显着差异。使用叶绿素a荧光技术，边界组织似乎没有光合作用，从该区域提取的共生菌具有光合作用能力。透射电子显微镜显示受影响区域共生菌周围的宿主组织广泛变性，但是，共生素细胞结构完整，没有原位降解的迹象。总体而言，这些结果表明，白色综合征病变边界处的共生素在活跃的宿主组织丧失过程中以动态的细胞内状态存在，但在生理上没有受到损害。

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