Association of bacteria with larvae of the gutless protobranch bivalve Solemya reidi (Cryptodonta: Solemyidae)
Association of bacteria with larvae of the gutless protobranch bivalve Solemya reidi (Cryptodonta: Solemyidae)
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细菌与无肠原分支双壳类 Solemya reidi 幼虫的关联（隐齿动物门：Solemyidae）
DOI：
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发表时间：
1988
期刊：
影响因子：
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通讯作者：
R. Reid
中科院分区：
文献类型：
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作者：
R. Gustafson;R. Reid
通过透射电子显微镜，在 Solemya reidi 幼虫的运动测试和 Solemya reidi 后幼虫的内脏周围腔中一致观察到杆状细菌，Solemya reidi 是一种无肠原鳃双壳类动物，已知在成体鳃中拥有细胞内化学自养细菌共生体。在幼虫测试中，细菌在颗粒状囊泡内发育，它们要么在变态时被摄入，要么被释放到分隔测试和胚胎的空间中，随后通过幼虫嘴摄入。无论哪种情况，细菌在变态后都位于内脏周围腔内。在幼鱼的配子内部或表面或鳃中均未发现细菌。据推测，这些细菌代表了成年雷迪雷氏菌中存在的鳃共生体的传播阶段，并且由于颗粒囊泡内的神秘包装而在幼鱼的配子或鳃中并不明显。因此，这种共生关系的永久存在将通过垂直传播得到保证，就像其他海洋无脊椎动物-细菌内共生关系的典型情况一样。
Rod-shaped bacteria were consistently observed by transmission electron microscopy in the locomotory test of larvae and in the perivisceral cavity of post-larvae of Solemya reidi, a gutless protobranch bivalve known to possess intracellular chemoautotrophic bacterial symbionts in the adult gill. Bacteria develop within granular vesicles in the larval test, where they either remain to be ingested at metamorphosis, or are released into the space separating the test and embryo, to be subsequently ingested through the larval mouth. In either case, bacteria lie within the perivisceral cavity following metamorphosis. Bacteria were not seen either in or on gametes or in gills of juveniles. It is hypothesized that these bacteria represent a transmission stage of the gill symbionts present in adult S. reidi and are not evident in gametes or gills of juveniles due to cryptic packaging within granular vesicles. Perpetuation of this symbiosis would therefore be assured through vertical transmission, as is typical of other marine invertebrate-bacteria endosymbioses.