神农架大九湖10种优势草本植物的叶解剖结构观察
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张亦嘉(1997-),女,山东安丘人,硕士研究生。E-mail:wodeyoutong@foxmail.com;

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Q949

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国家自然科学基金项目面上项目(42077408)


The leaf anatomy of ten herb species in Dajiuhuwetland, Mt. Shennongjia
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    摘要:

    【目的】 研究10 种草本植物的叶解剖结构。【方法】 采用常规石蜡切片技术对鹅观草(Elymuskamoji)等6 种禾本科植物和阿齐薹草(Carex argyi)等4 种莎草科植物的叶横切结构进行观察和比较。【结果】 10 种植物叶片均为等面叶,无叶肉组织的分化,植物叶肉细胞层数和排列紧密程度有所差异。10 种植物叶表皮均由1 层细胞组成,其中华刺子莞(Rhynchospora chinensis)上表皮细胞横切面厚度最大,且上下表皮细胞大小差异悬殊,翦股颖(Agrostis clavata)表皮细胞横切面积较小。不同植物叶表皮外无或有厚度不同的角质层,部分植物具有表皮毛,在翦股颖和画眉草(Eragrostis pilosa)表皮外还存在突起物,能良好适应旱生环境。鹅观草和阿齐薹草具有较发达的叶脉,翦股颖叶片维管束外有两层维管束鞘,形成明显的花环结构。除华刺子莞及华东藨草(Scirpus karuisawensis)外,其他8 种植物叶片上表皮处存在泡状细胞,泡状细胞组的细胞个数、形态及其在叶表皮的具体分布位置存在差异。华东藨草和阿齐薹草叶片中气腔大且明显,保证了在水分充足环境中的气体运输。【结论】 10 种植物叶片具有不同的旱生、中生或湿生结构特征,不仅在分类学中有一定意义,也能够体现植物对环境的适应。

    Abstract:

    【Objective】 This paper reports the study of the leaf anatomy of ten species of herbs.【Method】 Theconventional paraffin sectioning technique was used to examine the leaf transverse sections of six species of Poaceae,including Elymus kamoji and four species of Cyperaceae,including Carex argyi.【Result】 The leaves of all ten plantswere isopetalous,lacking differentiation of chloroplastic tissues. The number of layers of chloroplastic cells and the de-gree of tightness in arrangement varied. The leaf epidermis of all ten species consisted of a single layer of cells. Incross-section,the upper epidermal cells were thickness in Rhynchospora chinensis. The size of upper and lower epi-dermal cells differed significantly. The cross-sectional area of epidermal cells in Agrostis clavata was smaller. Differ-ent plants exhibited varying thickness of cuticle outside the leaf epidermis. Some had epidermal hairs,while A. cla-vata and Eragrostis pilosa showed protrusions outside the epidermis,aiding adaptation to the dry environment. Ely-mus kamoji and C. argyi had more developed leaf veins. and A. clavata leaves possessed two layers of vascularsheaths outside the vascular bundle,forming an obvious wreath structure. Bulliform cells were observed in the upperepidermis of eight species,with R. chinensis and Scirpus karuisawensis being exceptions. The number,morphologyand distribution of bulliform cells in the leaf epidermis varied among the eight plant species. The large and distinct aircavities in the leaves of S. karuisawensis and C. argyi ensured efficient gas transport in a well-watered environment.【Conclusion】 The ten plant species exhibited different structural features in their leaves,indicative of adaptation todry,mesophytic or wet environments. These features are not only taxonomically significant but also reflect the plants’adaptation to their respective environments.

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张亦嘉,王雅轩,林倩缇,郑敏,顾延生.神农架大九湖10种优势草本植物的叶解剖结构观察[J].草原与草坪,2024,(1):38-46

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  • 收稿日期:2022-12-15
  • 最后修改日期:2023-04-06
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  • 在线发布日期: 2024-03-25
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