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Micromorphological differentiation of Korean Disporum species using light and scanning electron microscopy
Microscopy Research and Technique ( IF 2.0 ) Pub Date : 2021-05-10 , DOI: 10.1002/jemt.23812 Hyeonjin Kim 1 , Bokyung Choi 1 , Changyoung Lee 2 , Scott A M McAdam 3 , Jin-Hyub Paik 2 , Tae-Soo Jang 1
Microscopy Research and Technique ( IF 2.0 ) Pub Date : 2021-05-10 , DOI: 10.1002/jemt.23812 Hyeonjin Kim 1 , Bokyung Choi 1 , Changyoung Lee 2 , Scott A M McAdam 3 , Jin-Hyub Paik 2 , Tae-Soo Jang 1
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The genus Disporum Salisb. is widely distributed in East Asia, yet phylogenetically relevant morphological traits useful for differentiating many of the small, perennial, herbaceous species remain poorly described. To address this, leaf, floral, pollen, and orbicule micromorphology of four Korean Disporum species was investigated using light and scanning electron microscopy. All Korean Disporum species examined had hypostomatic leaves, with anomocytic stomatal complexes found only on the abaxial epidermis. Guard cell length varied among species, ranging from 44.30 μm in D. viridescens to 53.49 μm in D. uniflorum. The epidermal cells of the investigated Disporum taxa had sinuate anticlinal cell walls on both adaxial and abaxial surfaces. The surface of the guard and subsidiary cells were either smooth with weak striations or had strongly wrinkled striations. The pollen grains of all Korean Disporum taxa were monads, monosulcate with granular aperture membranes, subprolate to prolate in shape with microreticulate or verrucate exine surfaces. The mean size of pollen grains ranged from 46.38 to 49.92 μm in polar length and from 34.39 to 39.58 μm in equatorial diameter across species. Sexine ornamentation was a taxonomically relevant trait for differentiating Korean Disporum taxa. Additionally, the presence of orbicules as well as the orbicular characters (e.g., size, shape, ornamentation, and association pattern) are described for the first time in species from this genus. The present investigation of leaf and floral micromorphology using light and scanning electron microscopy provides valuable information for the taxonomic differentiation and identification of Disporum species in Korea.
中文翻译：
利用光学和扫描电子显微镜对韩国 Disporum 物种进行微形态学区分
Disporum Salisb属。广泛分布于东亚，但对区分许多小型多年生草本物种有用的系统发育相关形态特征仍然缺乏描述。为了解决这个问题，使用光学和扫描电子显微镜研究了四种韩国Disporum物种的叶、花、花粉和球状体微形态。所检查的所有韩国Disporum物种都有下气孔叶，仅在背面表皮上发现了无细胞气孔复合体。不同物种的保卫细胞长度各不相同，从D. viridescens 的44.30 μm到D. uniflorum 的53.49 μm 。研究的Disporum的表皮细胞分类群在正面和背面都有波状的背斜细胞壁。保卫细胞和附属细胞的表面要么光滑，带有弱条纹，要么具有强烈的皱纹条纹。所有韩国Disporum类群的花粉粒都是单胞菌，具有颗粒孔膜的单槽，从近扁长到长长的形状，具有微网状或疣状外壁表面。花粉粒的平均大小极长为 46.38 至 49.92 微米，赤道直径为 34.39 至 39.58 微米。Sexine 装饰是区分韩国Disporum的分类学相关特征分类群。此外，首次在该属的物种中描述了球状体的存在以及球状特征（例如，大小、形状、装饰和关联模式）。目前使用光学和扫描电子显微镜对叶和花微形态的研究为韩国Disporum物种的分类分化和鉴定提供了有价值的信息。
更新日期：2021-05-10
中文翻译：
利用光学和扫描电子显微镜对韩国 Disporum 物种进行微形态学区分
Disporum Salisb属。广泛分布于东亚，但对区分许多小型多年生草本物种有用的系统发育相关形态特征仍然缺乏描述。为了解决这个问题，使用光学和扫描电子显微镜研究了四种韩国Disporum物种的叶、花、花粉和球状体微形态。所检查的所有韩国Disporum物种都有下气孔叶，仅在背面表皮上发现了无细胞气孔复合体。不同物种的保卫细胞长度各不相同，从D. viridescens 的44.30 μm到D. uniflorum 的53.49 μm 。研究的Disporum的表皮细胞分类群在正面和背面都有波状的背斜细胞壁。保卫细胞和附属细胞的表面要么光滑，带有弱条纹，要么具有强烈的皱纹条纹。所有韩国Disporum类群的花粉粒都是单胞菌，具有颗粒孔膜的单槽，从近扁长到长长的形状，具有微网状或疣状外壁表面。花粉粒的平均大小极长为 46.38 至 49.92 微米，赤道直径为 34.39 至 39.58 微米。Sexine 装饰是区分韩国Disporum的分类学相关特征分类群。此外，首次在该属的物种中描述了球状体的存在以及球状特征（例如，大小、形状、装饰和关联模式）。目前使用光学和扫描电子显微镜对叶和花微形态的研究为韩国Disporum物种的分类分化和鉴定提供了有价值的信息。
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