• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Cell motility and the cytoskeleton >Polar organizers in monoplastidic mitosis of hepatics (Bryophyta)
【24h】

Polar organizers in monoplastidic mitosis of hepatics (Bryophyta)

机译：Polar organizers in monoplastidic mitosis of hepatics (Bryophyta)

获取原文
           
页面导航
  • 摘要
  • 著录项
  • 相关主题

摘要

AbstractArchesporial cells of the hepaticMonoclea gottscheiLindb. undergo a series of monoplastidic mitotic divisions prior to enlarging into sporocytes. Interphase cells have a nuclear‐based endoplasmic microtubule system that is predominantly aligned in the long axis of the cell and lack a hoop‐like cortical system. No preprophase bands (PPBs) are formed. Prior to mitosis, the single plastid divides and daughter plastids move to the incipient spindle poles as is typical of monoplastidic cell division. However, the plastids do not serve as microtubule organizing centers (MTOCs) as they do in both mitosis and meiosis of hornworts and lycopsids, and in meiosis of mosses. Rather, microtubules of the developing spindle emanate from distinct polar organizers (POs) arising just outside the nuclear envelope as in polyplastidic mitosis in other hepatics. The POs, which appear to arise de novo on opposite ends of the nucleus during preprophase, consist of vesicles, endoplasmic reticulum, and radiating microtubules. The developmental and evolutionary significance of distinct POs, plastid MTOCs, and the diffuse MTOCs of higher plants is discussed. © 1992 Wiley‐Lis

著录项

获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号