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植物研究 ›› 2016, Vol. 36 ›› Issue (5): 705-711.doi: 10.7525/j.issn.1673-5102.2016.05.011

• 研究报告 • 上一篇    下一篇

连香树叶片发育与生态适应研究

马永红1,2   

  1. 1. 西南野生动植物资源保护教育部重点实验室, 南充 637009;
    2. 西华师范大学, 南充 637009
  • 收稿日期:2016-02-29 出版日期:2016-09-15 发布日期:2016-09-27
  • 作者简介:马永红(1977-),男,副教授,主要从事植物系统进化和野生植物资源教学和研究。
  • 基金资助:
    国家自然基金项目(31170389);四川省教育厅青年科学基金项目(2006B038)资助

Leaf Dvelopment and Its Ecological Adaptability of Cercidiphyllum japonicum

MA Yong-Hong1,2   

  1. 1. Key Laboratory of Southwest China Wildlife Rsources Conservation, Ministry of Education, Nanchong 637009;
    2. China West Normal University, Nanchong 637009
  • Received:2016-02-29 Online:2016-09-15 Published:2016-09-27
  • Supported by:
    National Nature Science Foundation Project(31170389);Youth Science Fund Project of the education department of Sichuan Province(2006B038)

摘要: 用石蜡切片法对连香树(Cercidiphyllum japonicum)叶片进行解剖学观察和研究,并从叶片不同发育阶段的形态变化、解剖结构差异等方面,探讨了其生态适应性。获得如下主要结果:(1)形态方面,叶片发育呈现边缘内卷期、幼叶开展期和生长成熟期三个时期。第1、2对幼叶的叶柄基部具发达的膜质叶鞘,叶鞘的发育呈现出:第一对幼叶的叶鞘发达、第二对较弱、其它幼叶无叶鞘;(2)解剖结构显示:连香树叶为典型异面叶、海绵组织发达;上下表皮均具较厚的角质层和气孔器、气孔外凸、叶片内机械组织和叶脉较发达、叶柄中段具发达的周韧维管束且有维管束鞘,显示连香树对干旱和阴湿环境均具较强的生态适应能力。(3)营养器官的基本组织细胞中存储有大量后含物,可能为繁殖时期器官的构建提供主要营养物质,而顶芽产生的第一对叶,仅对早春其它器官发育提供一定的物质补充。

关键词: 连香树, 叶片解剖, 发育, 生态适应

Abstract: Using the paraffin-section method, we studied the morphological variations and its ecological adaptability of Cercidiphyllum japonicum, based on the developmental regularities and difference between the immature leaf and mature leaf in anatomical structure. Leaf development were existed in three stages of leaf margin curl inward, expand and mature stage. The first and second pair immature leaves base have a well developed membranous sheath, with the most developed sheath on the first pair immature leaves and more developed sheath on the second, but not found on the others. The leaf of C.japonicum is typical bifacial leaf with developed spongy parenchyma, outer convex stoma apparatus in the upper and lower epidermis, developed cuticle, vein, mechanical tissue, a amphicribral vascular bundle in min-petiole and bundle sheaths, and the C.japonicum is with strong ecological adaptability to the drought and humid conditions. There are more ergastic substance stored in vegetative organs, which can offer the main nutrition for organ during in breeding season. The first pair immature leaves with faster growth rates also satisfy little nutritional requirements for other organ development.

Key words: Cercidiphyllum japonicum, leaf dvelopment, ecological adaptability, anatomical structure

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