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李景照, 黄红慧, 高立献, 王光明, 刘宗才. 奇形凤仙花的微形态特征及其系统演化意义[J]. 植物科学学报, 2020, 38(3): 301-307. DOI: 10.11913/PSJ.2095-0837.2020.30301
引用本文: 李景照, 黄红慧, 高立献, 王光明, 刘宗才. 奇形凤仙花的微形态特征及其系统演化意义[J]. 植物科学学报, 2020, 38(3): 301-307. DOI: 10.11913/PSJ.2095-0837.2020.30301
Li Jing-Zhao, Huang Hong-Hui, Gao Li-Xian, Wang Guang-Ming, Liu Zong-Cai. Micromorphological characteristics and systematic evolutionary significance of Impatiens paradoxa C. S. Chu et H. W. Yang (Balsaminaceae)[J]. Plant Science Journal, 2020, 38(3): 301-307. DOI: 10.11913/PSJ.2095-0837.2020.30301
Citation: Li Jing-Zhao, Huang Hong-Hui, Gao Li-Xian, Wang Guang-Ming, Liu Zong-Cai. Micromorphological characteristics and systematic evolutionary significance of Impatiens paradoxa C. S. Chu et H. W. Yang (Balsaminaceae)[J]. Plant Science Journal, 2020, 38(3): 301-307. DOI: 10.11913/PSJ.2095-0837.2020.30301

奇形凤仙花的微形态特征及其系统演化意义

Micromorphological characteristics and systematic evolutionary significance of Impatiens paradoxa C. S. Chu et H. W. Yang (Balsaminaceae)

  • 摘要: 采用光学显微镜和扫描电镜对奇形凤仙花(Impatiens paradoxa C.S.Chu et H.W.Yang)的叶表皮和花粉形态特征进行观察。结果显示:该物种叶上表皮无气孔器,表皮细胞为不规则多边形,垂周壁波状,表皮外为相邻细胞的壁突起形成的小格子,格子内具圆形突起结构,其外壁上具有条纹状纹饰;叶下表皮具有两个保卫细胞组成的椭圆形气孔器,下表皮细胞也为不规则多边形,垂周壁深波状,表皮外常具有梭形结构,相邻细胞的垂周壁也突起形成小格子,格子内具有圆形突起结构及条状纹饰;花粉为单粒花粉,极面观矩圆形,长、短赤道面观分别为长、短椭圆形,花粉4沟型,沟分布于4个角的位置,沟细、短且浅,花粉外壁为网状纹饰,网眼明显,网眼内具有突起的不均匀颗粒物。对该特有种的外部形态、叶表皮形态和花粉形态的系统学意义进行了讨论,认为该种是一个高度特化的类群。该种花较大呈黄色可以作为优良的观赏植物,该种的自然分布也表明伏牛山和秦岭大巴山脉植物区系的相似性。

     

    Abstract: The micromorphological characteristics of the leaf epidermis and pollen of Impatiens paradoxa C. S. Chu et H. W. Yang were observed by light microscopy (LM) and scanning electron microscopy (SEM). Results showed the following:there was no stomatal apparatus on the upper epidermis; epidermal cells were irregularly polygonal in shape with undulate anticlinal walls; the external upper epidermis were small lattices formed by cell wall protrusions of adjacent cells, with stripe ornamentation outside the circular protrusion; lower epidermis contained elliptical stomatal apparatus with two guard cells; lower epidermal cells were irregularly polygonal in shape with sinuate anticlinal walls; external lower epidermal cells contained small lattices with circular protrusions and stripe ornamentation, especially with fusiformis structure; pollen was single-grain, oblong in polar view, long elliptical in long equatorial view, short elliptical in short equatorial view, with four germinal furrows in the angular position, which were slender, short, and shallow; and outer pollen wall showed reticulate ornamentation, with prominent granules in the lumina at different densities. This article discusses the significance of external, leaf epidermis, and pollen morphology of an endemic species, which is considered a highly specialized group. Thus, with its large yellow flower, I. paradoxa could be used as an excellent ornamental plant. The natural distribution of I. paradoxa also indicates similarity in the flora of the Funiu and Qinling-Daba mountains.

     

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