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首页> 外文期刊>Protoplasma: An International Journal of Cell Biology >Attachment, penetration and early host defense mechanisms during the infection of filamentous brown algae by Eurychasma dicksonii
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Attachment, penetration and early host defense mechanisms during the infection of filamentous brown algae by Eurychasma dicksonii

机译：Eurychasma dicksonii感染丝状褐藻过程中的附着，渗透和早期宿主防御机制

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摘要

Eurychasma dicksonii is one of the most common and widespread marine pathogens and attacks a broad spectrum of more than 45 brown algal species. The present study focuses on the mechanism used by the pathogen to attach on the host cell wall and force its way into algal cells. Ultrastructural examination revealed a needle-like structure which develops within the attached spore and extends along its main axis. Particular cell wall modifications are present at the basal part of the spore (adhesorium pad) and guide the needle-like tool to penetrate perpendicularly the host cell wall. The unique injection mechanism is shared with Haptoglossa species which suggests that this is an important characteristic of early diverging oomycetes. Furthermore, the encystment and adhesion mechanism of E. dicksonii shows significant similarities with other oomycetes, some of which are plant pathogens. Staining and immunolabelling techniques showed the deposition of beta-1,3-glucans on the host cell wall at the pathogen penetration site, a strategy similar to physical responses previously described only in infected plant cells. It is assumed that the host defense in terms of callose-like deposition is an ancient response to infection.
机译：Eurychasma dicksonii是最常见和最广泛的海洋病原体之一，可攻击超过45种棕色藻类物种。本研究的重点是病原体用于附着在宿主细胞壁上并迫使其进入藻类细胞的机制。超微结构检查显示出在附着的孢子内发育并沿其主轴线延伸的针状结构。特定的细胞壁修饰存在于孢子的基部（粘附垫），并引导针状工具垂直穿透宿主细胞壁。与Haptoglossa物种共有独特的注射机制，这表明这是早期发散卵菌的重要特征。此外，狄克逊氏菌的包囊和粘附机制与其他卵菌具有明显的相似性，其中有些是植物病原体。染色和免疫标记技术表明，β-1,3-葡聚糖在病原体渗透位点沉积在宿主细胞壁上，该策略类似于先前仅在受感染植物细胞中描述的物理反应。假定就call质样沉积而言，宿主防御是对感染的古老反应。

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