Taxonomic Implications of Seed Coat in the Subtribe Calthinae (Ranunculaceae)
Taxonomic Implications of Seed Coat in the Subtribe Calthinae (Ranunculaceae)
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DOI：
10.11110/kjpt.2008.38.1.001
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发表时间：
2008-03
期刊：
影响因子：
--
通讯作者：
Kweon Heo;Y. Suh
中科院分区：
文献类型：
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作者：
Kweon Heo;Y. Suh
通过对毛茛科金莲花属、蹄花属和蹄花属植物种皮的解剖学特征进行研究，探讨了韩国特有的单型巨角菊属的分类学界限。尖叶巨角菊属外种皮型，外种皮栅栏结构发达，外种皮细胞外表面凹陷。马蹄莲外种皮细胞为长方体，外表面光滑。竹芋种子的外种皮由栅栏组织构成，类似于M. saniculifolia，但外种皮细胞外表面光滑。马蹄莲属和巨菊属种子外种皮的栅栏结构比金莲花属种子外种皮的栅栏结构发达得多。金莲花外种皮细胞的外表面依种属不同而有凸或凹。由于该科Calthinae亚族的属在种子雕刻和种皮anaotmy方面表现出差异，这些特征有助于访问它们之间的分类关系。根据种皮的形态和解剖学特征推测，Megaleranthis可能与金莲花属（Trolius）而不是蹄花属（Caltha）或蹄花属（Calathodes）有亲缘关系。种皮细胞表面凹陷，外种皮栅栏结构发达; saniculifolia和金莲花属的一些种类。
Anatomical features of seed coat were examined on Trollius, Calathodes, and Caltha of Ranunculaceae to evaluate the taxonomic circumscription of Megaleranthis saniculifolia, which is monotypic and endemic in Korea. Megaleranthis saniculifolia showed the exotestal type of seed coat exhibiting a well-developed palisade structure in exotesta and its external surface of exotesta cells was concave. On the other hand, the shape of exotesta cells in Caltha was cuboidal and the outer surface was smooth. The exotesta of Calathodes seeds was formed of the palisade structure like M. saniculifolia, but the outer surface of exotesta cells was smooth. The palisade structure was much better developed in the exotesta of Calathodes as well as Megaleranthis seeds than in the exotesta of Trollius seeds. The outer surface of exotesta cells in Trollius was either convex or concave according to the species examined. Since the genera of the subtribe Calthinae of the family display differences in seed sculpturing and the anaotmy of seed coat, these characteristics are useful to access taxonomic relationships among them. The morphological and anatomical features of seed coat suggest that Megaleranthis be possibly allied with Trollius rather than Caltha or Calathodes. Concave surface of seed coat cells and well-developed palisade structure of exotesta are shared by M. saniculifolia and some species of Trollius in common.