...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Protoplasma: An International Journal of Cell Biology >Laticifers in Camptotheca acuminata Decne: distribution and structure
【24h】

Laticifers in Camptotheca acuminata Decne: distribution and structure

机译：喜树的胶乳：分布和结构

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

In this paper, a system of laticifers in Camptotheca acuminata Decne (Nyssaceae) is described. Laticifers were already present in the leaf primordia of the shoot apex. In the mature leaves, laticifers were found in the midrib and in the larger veins, both in the parenchymatic region delimited by vascular bundles and in the cortex just external to the phloem. In the stem, laticifers were present in both the primary and secondary body, running parallel to the longitudinal axis. They were located in the pith and in the cortex proximal to the phloem. No laticifers were found in the roots. The histochemical analyses indicated that the main compounds accumulated in laticifers were phenols. Neutral lipids and fatty acids were also present. Ultrastructural observations showed osmiophilic globules both in the vacuoles and in the peripheral regions of the cytoplasm of the laticifer cells. Plastids were present, although altered, with some parallel membranes and lacking starch grains. The discovery in C. acuminata of a laticifer system, which had never been described for the order Cornales, could be of taxonomic value, also considering that this order has traditionally represented one of the most problematic groups of flowering plants.
机译：在本文中，描述了喜树（Cytotheca acuminata Decne（Nyssaceae））的胶乳系统。嫩枝已经存在于茎尖的叶原基中。在成熟的叶片中，在中脉和较大的静脉中都发现了胶乳虫，既在脉管束界定的薄壁组织区域中，又在韧皮部的外部皮层中。在茎中，幼虫同时存在于初级和次级体中，与纵轴平行。它们位于韧皮部附近的髓和皮质中。根部未发现乳胶虫。组织化学分析表明，胶乳中积累的主要化合物是酚。还存在中性脂质和脂肪酸。超微结构观察显示在乳胶细胞的液泡和细胞质外围区域都具有渗透性小球。存在质体，尽管有所改变，但具有一些平行的膜且缺乏淀粉颗粒。在尖角梭菌中发现从未发现过的Cornales顺序的胶乳系统可能具有生物分类学价值，同时考虑到该顺序传统上是开花植物中最成问题的一组。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
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