欢迎访问《植物研究》杂志官方网站,今天是 分享到:

植物研究 ›› 2024, Vol. 44 ›› Issue (4): 517-527.doi: 10.7525/j.issn.1673-5102.2024.04.005

• 系统与进化 • 上一篇    

11种1变种单叶花楸的叶表皮微形态

魏雪妍, 谭宝梅, 张弛, 李嘉宝, 陈昕()   

  1. 南京林业大学南方现代林业协同创新中心,南京林业大学生命科学学院,南京 210037
  • 收稿日期:2024-01-18 出版日期:2024-07-20 发布日期:2024-07-09
  • 通讯作者: 陈昕 E-mail:chenxinzhou@njfu.edu.cn
  • 作者简介:魏雪妍(1999—),女,硕士研究生,主要从事植物资源研究。
  • 基金资助:
    江苏省自然科学基金项目(BK20141472)

Foliar Epidermal Micromorphology of Eleven Species and One Variety of Simple-Leaved Sorbus

Xueyan WEI, Baomei TAN, Chi ZHANG, Jiabao LI, Xin CHEN()   

  1. Co -innovation Center for Sustainable Forestry in Southern China,College of Life Sciences,Nanjing Forestry University,Nanjing 210037
  • Received:2024-01-18 Online:2024-07-20 Published:2024-07-09
  • Contact: Xin CHEN E-mail:chenxinzhou@njfu.edu.cn

摘要:

为探讨叶表皮微形态特征的分类学意义,以中国产花楸属(Sorbus)冠萼组(sect. Aria)和落萼组(sect. Micromeles)11种1变种单叶类群为研究对象,利用光学显微镜和扫描电镜对其特征进行观察。结果如下:单叶花楸的叶表皮细胞呈多边形或不规则形;多边形细胞的垂周壁平直或弧状,不规则形细胞的垂周壁弧状或波状;表皮细胞面积在分类群间差异显著,且上表皮细胞面积均大于下表皮细胞;细胞表面纹饰有脊状、条状、皱褶、次生加厚、局部加厚,蜡质纹饰有壳状、颗粒状、片状、线状;叶光滑或具毛,毛被的位置、颜色、疏密和类型是重要的物种鉴定特征;气孔均为无规则型,分布于下表皮脉间区,保卫细胞具环形外缘、两极有或无T型加厚;气孔的长、宽、面积、密度和气孔指数在分类群间差异显著。由此,叶表皮微形态特征对单叶花楸的物种界定和鉴定具有重要价值。

关键词: 单叶花楸, 叶表皮, 微形态特征, 分类意义

Abstract:

To evaluate the taxonomic significance of leaf epidermal micromorphological characteristics, 11 species and one variety of simple-leaved Sorbus from sect. Aria and sect. Micromeles native to China were investigated using light microscopy(LM)and scanning electron microscopy(SEM). The results showed that the shapes of epidermal cells wereirregular or polygonal-irregular. Anticlinal wall of polygonal cells was straight or arched, and anticlinal wall of irregular cells was arched or wavy. The area of epidermal cells varied significantly among taxa, and the size of the upper epidermal cells was larger than the lower epidermal cells. Cuticular ornaments such as ridges, striations, wrinkles, secondary thickening, thickened areas, and epicuticular waxy ornamented with crusts, granules, threads, and platelets were observed by scanning electron microscopy. Leaves were glabrous or with trichomes, and the position, color, density, and type of trichomes were important characters for the segregation of the taxa. Stomatal apparatuses were anomocytic and distributed in areole of abaxial epidermis. Guard cells had annular outer edges, with or without T-piece at stomatal pole. The cell size, length, width, area, density, and index of stomata varied significantly among taxa. Therefore, foliar epidermal micromorphology proved to be valuable for simple-leaved Sorbus taxa definition and identification.

Key words: simple-leaved Sorbus, leaf epidermis, micromorphological characteristics, taxonomic implication

中图分类号: