ZOOSPORE ULTRASTRUCTURE OF ZYGORHIZIDIUM-AFFLUENS AND ZYGORHIZIDIUM-PLANKTONICUM, 2 CHYTRIDS PARASITIZING THE DIATOM ASTERIONELLA-FORMOSA
ZOOSPORE ULTRASTRUCTURE OF ZYGORHIZIDIUM-AFFLUENS AND ZYGORHIZIDIUM-PLANKTONICUM, 2 CHYTRIDS PARASITIZING THE DIATOM ASTERIONELLA-FORMOSA
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DOI：
10.1139/b88-151
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发表时间：
1988-06-01
期刊：
影响因子：
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通讯作者：
JAWORSKI, GHM
中科院分区：
文献类型：
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作者：
BEAKES, GW;CANTER, HM;JAWORSKI, GHM
本文描述了两种对淡水浮游硅藻Asterionella福尔摩沙Hassall致病的接合孢游动孢子的微细结构。Zygorhizidium affluens Canter和Z.小孢子囊和游动孢子具单着丝粒的有盖孢子囊，游动孢子具单个脂球，细胞核和单个孢子囊紧贴在脂球上。几个特征将Z放置在。在壶菌目（Chytridiales sensu）巴尔（Barr.这些包括其运动体和无功能的中心粒与细胞核不密切相关，并具有由内质网界定的富含核糖体的核心区域。然而，没有细胞质微管或膜rumposome复合体在这个物种。Z.具有分散或松散聚集的核糖体和一个rumposome复合体。该物种的游动孢子似乎属于病原性合壶菌属（Synchytrium）的相同形态亚型，合壶菌属也被归入壶菌目（Chytridiales）。Zygorhizidium spermatonicum游动孢子具有一些囊泡类型显然是这个物种所独有的，并具有一个无功能的中心粒，它是由一个环状的单线态微管构成的，通常与动体完全分离。这两个物种都含有“外周囊泡”系统，可能参与调节内部水势。从这项研究来看，这两个物种似乎不太可能密切相关，尽管它们被置于同一属。
The fine structure of zoospores of two Zygorhizidium species pathogenic on the freshwater planktonic diatom Asterionella formosa Hassall, are described. Zygorhizidium affluens Canter and Z. planktonicum Canter have monocentric operculate sporangia and zoospores which have single lipid globules to which the cell nucleus and single mitochondrion are closely adpressed. Several features place Z. affluens in the Chytridiales sensu Barr. These include having its kinetosome and nonfunctional centrioles not closely associated with the nucleus and having a ribosome-rich core region delimited by endoplasmic reticulum. However, there are no cytoplasmic microtubules or membranous rumposome complex in this species. In contrast, zoospores of Z. planktonicum have dispersed or loosely aggregated ribosomes and a rumposome complex. The zoospores of this species appear to belong to the same morphological subtype as the pathogenic genus Synchytrium, which has also been placed in the Chytridiales. Zygorhizidium planktonicum zoospores possess a number of vesicle types apparently unique to this species and have a nonfunctional centriole which is constructed of a ring of singlet microtubules and is often completely disassociated from the kinetosome. Both species contain "peripheral vesicle" systems which are probably involved in regulating internal water potential. From this study it seems unlikely that the two species are closely related, although they have been placed in the same genus.