Morphological and ultrastructural analysis of Turritopsis nutricula during life cycle reversal
Morphological and ultrastructural analysis of Turritopsis nutricula during life cycle reversal
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DOI：
10.1016/s0040-8166(03)00028-4
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发表时间：
2003-06-01
期刊：
影响因子：
2.6
通讯作者：
Dini, L
中科院分区：
文献类型：
--
作者：
Carla', EC;Pagliara, P;Dini, L
在正常情况下，水螅生命周期的特点是幼体后的底栖息肉和成体中上层水母的交替。然而，水螅的一些物种通过恢复其生命周期来应对环境压力：即成年水母回到水螅体的幼年阶段。这种非常不寻常的生命周期可以被视为某种反向变态。对灯塔水母恢复生命周期不同阶段的形态学研究得出了四个不同阶段的特征：健康水母、不健康水母、四叶草和囊肿。细胞修饰的超微结构研究（在 T nutricula 的生命周期逆转期间）表明存在退行性和凋亡过程。在不健康的水母时期，退化现象很普遍。和四叶草阶段，而健康水母阶段的细胞凋亡率较高。和囊肿阶段。退行性和凋亡过程的显着存在可能与成年水母转变为息肉时发生的某种变态有关。 (C) 2003 Elsevier Science Ltd. 保留所有权利。
The hydrozoa life cycle is characterized, in normal conditions, by the alternation of a post-larval benthic polyp and an adult pelagic medusa; however, some species of Hydrozoa react to environmental stress by reverting their life cycle: i.e. an adult medusa goes back to the juvenile stage of polyp. This very uncommon life cycle could be considered as some sort of inverted metamorphosis. A morphological study of different stages during the reverted life cycle of Turritopsis nutricula led to the characterization of four different stages: healthy medusa, unhealthy medusa, four-leaf clover and cyst. The ultrastructural study of the cellular modifications (during the life cycle reversion of T nutricula) showed the presence of both degenerative and apoptotic processes. Degeneration was prevalent during the unhealthy medusa. and four-leaf clover stages, while the apoptotic rate was higher during the healthy medusa. and cyst stages. The significant presence of degenerative and apoptotic processes could be related to the occurrence of a sort of metamorphosis when an adult medusa transforms itself into a polyp. (C) 2003 Elsevier Science Ltd. All rights reserved.