식물분류학회지 (Korean Journal of Plant Taxonomy)

  • 제43권1호
  • /
  • Pages.1-11
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  • 2013
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  • 1225-8318(pISSN)
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  • 2466-1546(eISSN)
한국식물분류학회 (The Korean Society of Plant Taxonomists)
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대극아과(대극과)의 화분형태

Pollen morphology of subfamily Euphorbioideae (Euphorbiaceae)

  • 박기룡 (경남대학교 과학교육과) ;
  • 이정훈 (경남대학교 과학교육과)
  • Park, Ki-Ryong (Department of Science Education, Kyungnam University) ;
  • Lee, Jung-Hun (Department of Science Education, Kyungnam University)
  • 투고 : 2013.02.14
  • 심사 : 2013.03.12
  • 발행 : 2013.03.29
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초록

대극아과(Euphorbioideae)에 속하는 20종과 클로톤아과(Crotonoideae)의 1종을 대상으로 광학현미경과 주사 및 투과전자현미경을 이용하여 화분의 형태를 조사하였다. 화분형태학적 연구결과는 대극아과의 단계통 기원을 지지할 수 없으며, Stomatocalyceae족에서 나타나는 발아구연이 뚜렷하지 않고, 연속적이고 두꺼운 내표벽의 특징 등은 Stomatocalyceae가 대극아과로부터 독립시키는 것을 제안하고 있고, 이와 같은 해석은 기존의 계통분석 결과나 해부학적 결과와도 잘 일치하고 있다. 본 연구결과에서 나타난 이 족의 화분특징은 본 족이 화분형태적으로 깨풀아과(Acalyphoideae)와 연관성이 있음을 시사하고 있다. Stomatocalyceae의 2개의 아족은 화분형태적으로 잘 구별이 되는데: Hamilcoinae는 망상 혹은 미세망상의 표벽 무늬를 갖고 있고, Stomatocalycinae은 유공상의 표면에 작은 돌기가 존재한다. 대극족(Euphorbieae)의 세 아족은 서로 다른 유형으로 분류되는데, Euphorbiinae아족은 유공상, Neoguillauminiinae아족은 미세망상, Anthosteminae아족은 망상의 표벽무늬로 분류되어 Webster의 아족 분류체계를 잘 지지한다. Hureae와 Hippomaneae족은 유공상 패턴에 밋밋한 발아구연을 갖고 있어 유사한 화분형태를 보여주고 있다. 특히 Hura crepitans종에서 보여지는 표벽의 미세돌기는 Hippomaneae족의 Excoecaria속 종들과의 가까운 유연관계를 제시해준다. 기존 연구에 의하면 발아구연을 따라 독특한 비후된 내벽을 갖는 특징은 대극과에서 Euphorbieae족에서만 나타났다. 하지만 이번 연구에 의하면 동일한 비후된 내벽이 Maprounea brasiliensis와 Hura crepitans의 발아구연에서도 발견되었다. 대극족과 위 두 종에서 나타나는 유사한 내벽의 비후는 이들 간에 매우 가까운 유연관계가 있음을 보여주는 증거로 추측된다.

Pollen morphology of 20 species of Euphorbioideae and one from Crotonoideae was examined with light, scanning and transmission electron microscopy. The pollen morphology presented here did not support the monophyly of Euphorbioideae, and the unique characters of tribe Stomatocalyceae such as absence of aperture margins, and thick and continuous endexine suggest the exclusion of Stomatocalyceae from Euphorbioideae which is in accordance with previous phylogenetic studies and wood anatomical data. Aforementioned pollen features in this tribe support that it is closely related to Acalyphoideae. Two subtribes of Stomatocalyceae were well recognized in terms of pollen morphology: Hamilcoinae includes species with reticulate or microreticulate exine patterns, and Stomatocalycinae includes those with perforate patterns with small supratectal elements. Three subtribes of Euphorbieae, classified in terms of pollen morphology, were further divided into three different types including perforate in Euphorbiinae, microreticulate in Neoguillauminiinae and reticulate in Anthosteminae, strongly supporting the Webster's subtribal system. Hureae and Hippomaneae, having perforate sculpturing pattern with smooth margo, were similar in pollen morphology. Especially, the presence of small supratectal elements in Hura crepitans pollen suggests the close relationships with Excoecaria species of tribe Hippomaneae. According to the previous studies, unique intine thickness along the aperture margin in Euphorbieae was not reported elsewhere in Euphorbiaceae. However, in this study we found the same intine thickness along the aperture margin in Maprounea brasiliensis and Hura crepitans. We hypothesize that the similar intine thicknesses found in Euphorbieae and above two species are the evidence of close relationships among them.

키워드

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피인용 문헌

  1. Incadendron : a new genus of Euphorbiaceae tribe Hippomaneae from the sub-Andean cordilleras of Ecuador and Peru vol.85, 2017, https://doi.org/10.3897/phytokeys.85.14757
  2. A new disjunct Dendrothrix (Euphorbiaceae, tribe Hippomaneae): a Guiana Shield element in sub-Andean cordilleras of Ecuador and Peru vol.86, pp.1314-2011, 2017, https://doi.org/10.3897/phytokeys.86.14761
  3. Pollen morphology and character evolution in the subtribe Neoguillauminiinae (Euphorbiaceae) vol.49, pp.2, 2013, https://doi.org/10.11110/kjpt.2019.49.2.101
  4. Pollen atlas for selected subfamilies of Euphorbiaceae from Southern China: a complementary contribution to Quaternary pollen analysis vol.44, pp.4, 2013, https://doi.org/10.1080/01916122.2019.1658235