湖北省楠属植物叶表皮微形态特征及其分类学意义
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1.长江大学;2.湖北省竹溪县双竹林场

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湖北省科技支撑计划项目(2013BBB24);湖北竹溪县国家楠木种质资源库项目(2020H21003,2022H21003)


Micromorphological characteristics of leaf epidermis and its Taxonomic Sgnificance of Phoebe Plants in Hubei Province
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Hubei Provincial Science and Technology Support Plan Project(2013BBB24);National Nanmu Germplasm Resource Bank Project in Zhuxi County, Hubei Province(2020H21003,2022H21003).

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    摘要:

    【目的】楠属(Phoebe)各物种在形态学方面差异甚微,种间界限模糊,物种的识别鉴定较为困难,尤其在缺少花、果的时期。叶微形态特征对植物种间界定具有重要价值,但目前楠属植物叶显微特征的研究仍然较少。【方法】利用体视显微镜、光学显微镜对湖北省楠属8种及1变种的叶形态和微形态进行观察,并测定分析各物种气孔、表皮毛的质量和数量性状,以期为楠属植物的识别和鉴定提供必要依据。【结果】结果表明,叶形态有大型叶、中型叶、小型叶和不规则叶4种类型;毛被类型有粗短柔毛、细短柔毛、长柔毛、混生短柔毛和长柔毛(脉上被长柔毛)4种。毛密度在湘楠(200根/mm2)与闽楠、浙江楠、紫楠(低于100根/mm2)之间差异显著。表皮细胞类型为多边形或不规则形,垂周壁为平直-弓形、浅波或波状。气孔除披针叶楠、闽楠、裂叶白楠为近圆形外,其余物种均为宽椭圆形。气孔密度以紫楠最高,山楠和湘楠最低。此外,气孔大小与气孔密度之间,毛长度与毛密度之间存在负相关关系。【结论】研究表明,叶形态和微形态的特征组合可作为9种楠属植物鉴定和区分的必要依据,可为楠属植物识别和种间界定提供参考。

    Abstract:

    【Objective】 Most species of phoebe are similar in morphology and the boundaries among species are blurred, making the identification and recognition of species very difficult, particularly in the period without flowers and fruits. Micromorphological characteristics of leaves are valuable for the interspecific definition of plants, but studies on Phoebe in this aspect are still scarce. 【Methods】 In this study, authors observed leaf morphology and leaf micromorphology of eight species and one variant of Phoebe in Hubei Province using stereo microscope and light microscope. For all species, authors measured and analyzed the quality properties and quantity properties of stomata and trichomes. The purpose is to provide the necessary basis for the identification and classification of Phoebe. 【Results】 Four types of leaf shapes were characterized, including large, medium, small, and irregular leaves. Trichomes were grouped into thin pubescent, thick pubescent, villous, and mixed pubescent and villous (villous trichomes are mainly found on leaf veins). The trichoid density of P. hunanensis (200 roots/mm2) differed significantly to P. bournei, P. chekiangensis, and P. sheareri (under 100 root/mm2). Shapes of epidermis cells were polygon or irregular, and the anticlinal wall in epidermis cells was classified intostraight-curved, sinuolate or undulated. The shape of stomatas was wide oval or nearly round. Density of stomatal apparatus was highest in P. sheareri(with an average of 700/mm2), and was lowest in P. chinensis and P. hunanensis (less than 500/mm2). In addition, there was a significant negative correlation between density and aspect ratio of stoma, as well as density and length of trichome. 【Conclusion】 It is suggested that the combination of morphological and micromorphological characteristics of leaves could not only provide important basis for identification and differentiation of the nine species, but also provide necessary references for interspecific definition of phoebe.

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熊雪芬,周本庚,毛春燕,等.湖北省楠属植物叶表皮微形态特征及其分类学意义[J].西北植物学报,2024,44(4):662-672

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  • 收稿日期:2023-09-11
  • 最后修改日期:2023-12-01
  • 录用日期:2023-12-03
  • 在线发布日期: 2024-03-07
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