Morphogenesis of Holosticha bradburyae (Protozoa, Ciliophora) during asexual reproduction cycle
Morphogenesis of Holosticha bradburyae (Protozoa, Ciliophora) during asexual reproduction cycle
复制标题
DOI：
10.1078/0932-4739-00903
复制
发表时间：
2003
影响因子：
2.9
通讯作者：
Xiaozhong Hu;Weibo Song;Toshikazu Suzuki
中科院分区：
文献类型：
--
作者：
Xiaozhong Hu;Weibo Song;Toshikazu Suzuki
本文报道了采自青岛近海贝类养殖沃茨的布氏全孔甲（Holosticha bradburyae Gong et al.2001）的形态发生事件。其形态发生具有以下特点：（1）在原口鱼中，原口原基形成于原口颊腔的底部和右侧，其形成不受波状膜的破坏，原口原基的发育取代了原口颊器的后部，而保留了原口颊器的前部;（2）两分裂部的额腹横嵴原基均为一排斜条，（3）每一条斜条均分为三段（新纤毛），除了最后两个原基各产生四个或五个外，最后一个原基产生两个额端纤毛;（4）边缘原基也是重新形成的;（5）背动体的发生方式为两组型，即两组背动体原基分别在最左和最右的背动体附近重新形成，并逐渐取代原有的结构;（6）大核节的复制带出现在形态发生的早期。根据现有的形态发生学资料，全裂蕨属具有多种系统发育模式，这可能表明该属在进化上已经达到了一个分支点。
Morphogenetic events during the division of the marine hypotrichous ciliate Holosticha bradburyae Gong et al. 2001, collected from mollusc culturing waters off the coast of Qingdao, China are described, based on protargol-impregnated specimens. Its morphogenesis is characterized by the following features: (1) in the proter, a new oral primordium is formed on the bottom and at the right of the parental buccal cavity; disorganization of the undulating membrane does not contribute to the formation of this oral primordium, which develops to replace the posterior part of the parental buccal apparatus, while the anterior part is retained; (2) fronto-ventral-transverse cirral anlagen in both division parts originate de novo as a row of oblique streaks; (3) each of these oblique streaks divides into three segments (new cirri), except for the last two anlagen which produce four or five each, the last anlage of which contributes two frontoterminal cirri; (4) marginal anlagen are also formed de novo; (5) the generating mode of the dorsal kineties is of a two-group type, that is, two groups of dorsal kinety anlagen develop de novo near the leftmost and rightmost dorsal kineties respectively, which evolve to replace the old structures; (6) replication bands of macronuclear segments appear at early morphogenetic stages. Based on available morphogenetic data, Holosticha exhibits multiple phylogenetic patterns, which possibly indicates that this genus has reached a branching point in terms of evolution.