| 摘要: |
| 于1991年6月在青岛海区采集到一腹毛目纤毛虫，寡毛双眉虫。应用蛋白银技术研究了其无性生殖期间的细胞发生学，其特征为：1）AZM原基独立地出现于远离横棘毛的前方而非紧靠老的横棘毛附近；2）口棘毛并非来自第一PVT原基（在后仔虫），而是由UM原基分化而来；3）老的AZM将发生后半部的局部重建而非整个地由前任虫简单继承。 |
| 关键词: 形态发生 纤毛虫 寡毛双眉虫 |
| DOI： |
| 分类号: |
| 基金项目:国家自然科学基金项目，39370091号 |
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| CORTICAL EVOLUTION AND MORPHOGENESIS OF DIOPHRYS OLIGOTHRIX BORROR, 1965 DURING ASEXUAL REPRODUOING CYCLE |
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Song Weibo
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College of Fisheries, Ocean University of Qingdao, Qingdao 266003
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| Abstract: |
| Morphogenetic events during division of the marine hypotrichous ciliate Diophrys oligothrix (Borror, 1965) from coast of Qingdoo in 1991 were investigated by light microscopy on protargo1-impregnated specimens. The morphogenesis of both the ventral and dorsal infraciliature proceeds in a very similar way to that in D. scutum. The opisthe oral primordium (OP), which develops in a subsurface pouch, forms de novo anterior to the parental transverse cirri. Basal bodies formed in the OP field are not contributed to any other cirral anlagen. Only the rear part of the parental adoral zone of membranelles (AZM) appeared to be reorgnized during the later morphogenetic process and then was inherited by the proter. Both the endoral
and paroral membrane (UM) develop from an “extra” anlage which derives from the posterior end of the reorgnized AZM in the proter and from the oral primordium in the opisthe. All cirral anlagen also form de novo and do not develop in association with any parental structures. Each of the 4 dorsal kineties evolves from a separate dorsal kinety anlage in both proter and opisthe. The replication band at the distal end of each macronucleus proceeds anteriorly and disappears as the two nuclear segments fuse.
This investigation documents several ontogenetic differences among the species of the geneus Diophrys. The morphogenetic process in our population differs from that in D. scutum in the position of the oral primordium which is distinctly anterior to the transverse cirri and between the marginal cirri, the reorgnization of the parental AZM is limited merely to the last 1/3 of its length and is relatively inconspious. In contrast to the previous report, the origin of the UM and paroral cirrus in both proter and opisthe is apparently connected with the “existing” oral primordium (in opisthe) or reorganizing part of parental AZM and UM (in proter). |
| Key words: Morphogenesis, Ciliophora, Diophrys oligothrix |
