The Hydra viridis/Chlorella symbiosis.: Growth and sexual differentiation in polyps without symbionts
The Hydra viridis/Chlorella symbiosis.: Growth and sexual differentiation in polyps without symbionts
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DOI：
10.1078/0944-2006-00104
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发表时间：
2003-01-01
期刊：
影响因子：
2
通讯作者：
Bosch, TCG
中科院分区：
文献类型：
--
作者：
Habetha, M;Anton-Erxleben, F;Bosch, TCG
为了研究基底后生动物水螅绿水螅及其共生小球藻之间的相互作用，我们产生了缺乏藻类的脱共生水螅，并将它们与共生水螅在生长和性分化方面进行了比较。在标准的饲养条件下，非共生息肉增殖类似于共生息肉。在中等和低的喂养条件下，无性生长减少在珊瑚虫缺乏藻类，表明共生体提供营养物质给他们的主机。此外，小球藻共生体对水螅的有性生殖有很大的影响：在大多数情况下，只有当共生藻类存在时，雌性性腺才产生。精子发生在共生和非共生息肉中进行相似。由于在卵子发生过程中，共生体从内胚上皮细胞主动转移到外胚卵母细胞，这种卵子发生促进作用可能表明共生体在控制绿色水螅的性分化中发挥着关键作用。
To investigate interactions between the basal metazoan Hydra viridis and its symbiotic Chlorella algae, we generated aposymbiotic hydra lacking algae and compared them to symbiotic ones with regard to growth and sexual differentiation. Under standard feeding conditions aposymbiotic polyps proliferated similarly to symbiotic polyps. Under moderate and low feeding conditions asexual growth was reduced in polyps lacking algae, indicating that the symbionts supply nutrients to their hosts. In addition, the Chlorella symbionts had a strong influence on the sexual reproduction of Hydra viridis: in most cases female gonads were produced only when symbiotic algae were present. Spermatogenesis proceeded similarly in symbiotic and aposymbiotic polyps. Since during oogenesis symbionts are actively transferred from endodermal epithelial cells to the ectodermal oocytes, this oogenesis promoting role could indicate that the symbionts are critically involved in the control of sexual differentiation in green hydra.