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Transovarial transmission of symbionts in Xiphinema brevicollum (Nematoda: Longidoridae)

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For more content, see Nematologica.

Transovarial transmission of bacterial symbionts in Xiphinema brevicollum was examined by means of electron microscopical- and fluorescence microscopical observations of intra-uterine and freshly laid non-embryonated eggs, as well as of embryonated eggs. The symbionts are mainly aggregated near one of the egg poles and this is observed in non-embryonated as well as in embryonated eggs. The bacteria are present in intestinal cells of first stage juveniles that are still enclosed by the egg-shell. In subsequent juvenile developmental stages their number increases and the intestinal cells are filled with the symbionts. Bacteria were not present in the genital primordium. It is hypothesised that the aggregated symbionts at one of the egg poles become enclosed in the E founder cell during embryogenesis and subsequently are distributed to the endodermal daughter cells. The bacteria become enclosed in the ovarial wall through an unknown mechanism only during the later stages of gonad development.

Transmission transovarienne des symbiontes de Xiphinema brevicollum (Nematoda: Longidoridae) - La transmission transovarienne des symbiontes bactériens de Xiphinema brevicollum a été étudiée par observations en microscopie électronique et à fluorescence d'œufs non embryonnés, encore contenus dans l'utérus ou fraichement pondus, et d'œufs embryonnés. Les symbiontes sont en majorité agrégés à l'un des pôles de l'œuf, que celui-ci soit embryonné ou non. Les bactéries sont présentes dans les cellules intestinales du premier stade juvénile encore contenu à l'intérieur de la coque de l'œuf. Chez les stades juvéniles ultérieurs leur nombre croît et les cellules intestinales sont remplies de symbiontes. Ces bactéries sont absentes du primordium génital. L'hypothèse est avancée que les symbiontes agrégés à l'un des pôles de l'œuf se retrouvent, au cours de l'embryogenèse, dans la cellule fondatrice E et sont par la suite répartis dans les cellules endodermiques filles. Les bactéries ne se retrouvent dans la paroi ovarienne que lors des derniers stades du développement de la gonade par un mécanisme encore inconnu.

Affiliations: 1: Biology Department, Ghent University K.L. Ledeganckstraat, 35, 9000 Ghent, Belgium; 2: Biology Department, Department of Biochemistry, Physiology and Microbiology, Ghent University K.L. Ledeganckstraat, 35, 9000 Ghent, Belgium; 3: Biology Department,Ghent University K.L. Ledeganckstraat, 35, 9000 Ghent, Belgium


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