Korean Journal of Plant Taxonomy (식물분류학회지)

The Korean Society of Plant Taxonomists (한국식물분류학회)
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Seed morphology of Euphorbia section Zygophyllidium and related taxa

대극속 Zygophy llidium절과 근연 분류군의 종자 형태

  • Jin , Sun-Mi (Graduate School of Education, Kyung-Nam University) ;
  • Park, Ki-Ryong (Department of Science Education, Kyung-Nam University)
  • 진선미 (경남대학교 교육대학원) ;
  • 박기룡 (경남대학교 과학교육과)
  • Published : 2008.12.31
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Abstract

Seed morphological studies of 12 species of sect. Zygophyllidium and related Poinsettia using light and scanning electron microscopy were conducted to test the hypotheses of the sectional boundaries and species relationships. Characteristics of seeds, and the keys of identification of 12 species were presented. Seeds of 12 species were divided into 6 types based on the UPGMA tree from numerical analyses using nine seed characters. Type I, including E. uniglandulosa, is characterized by the foveolate seed with granulate testa cells. Type II, including species E. exstipulata, E. lagunensis, E. bilobata, E. hexagonoides and E. chersonesa, was recognized by the presence of inter-cellular granules among testa cells. Type III, including E. cyathophora, has a seed with acute apex, and concentric circles on the surface of testa cells. Type IV, including species of E. dentata and E. pentadactyla, has a seed with caruncle and lacking inter-cellular granules among testa cells. Type V, including E. hexagona, was characterized by the ovate seeds and lacking inter-cellular granules. Type VI, including E. eriantha and E. lacera, was recognized by the seeds with rectangular shape with caruncle. Based on the seed morphology, sect. Zygophyllidium should be defined only species with E. exstipulata, E. lagunensis, E. bilobata, E. hexagonoides and E. chersonesa. E. hexagona, traditionally included in this section, was closely related to E. dentata from Poinsettia.

대극과 대극속 Zygophyllidium절의 한계와 종간 유연관계를 알아보기 위하여 Zygophyllidium절과 Poinsettia아속에 속하는 12종 종자를 광학현미경과 주사전자현미경으로 관찰하였다. 12종에 대해 종자의 특징을 기재하였으며, 검색표를 작성하였다. 9개의 종자 형질을 이용한 수리분석 결과를 바탕으로 다음과 같이 6개의 유형으로 구분하였다. Type I(Euphorbia uniglandulosa)는 종자표면에 작은 구멍이 있으며, 세포표면에 미세입자가 존재한다. Type II(E. exstipulata, E. lagunensis, E. bilobata, E. hexagonoides, E. chersonesa)는 종자 표면의 testa cell 사이에 미세과립을 가진다. Type III(E. cyathophora)는 종자의 선단이 뾰족, 세포 표면에는 동심원의 주름을 가진다. Type IV(E. dentata와 E. pentadactyla)는 종부를 갖고 있으며 testa cell 사이에 미세과립이 없다. Type V(E. hexagona)는 둥근 난형으로 세포 간 미세과립이 존재하지 않는다. Type VI(E. eriantha, E. lacera)는 종자의 모양이 사각형이며, 종부를 가지고 있다. 본 연구를 통해 Zygophyllidium절을 E. exstipulata, E. lagunensis, E. bilobata, E. hexagonoides, E. chersonesa만을 포함하는 Type II의 분류군들로 설정하는 것을 제안하며, 전통적으로 Zygophyllidium절에 포함시켰던 E. hexagona는 Poinsettia아속의 E. dentata와 유연관계가 있음을 시사하고 있다.

Keywords

Acknowledgement

Supported by : 경남대학교

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