Korean Journal of Plant Taxonomy (식물분류학회지)

The Korean Society of Plant Taxonomists (한국식물분류학회)
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Morphological variation and aspects of the geographic distribution of Orobanche coerulescens Stephan ex Willd. (Orobanchaceae) on Ulleung-do and Dok-do Islands

울릉도, 독도 초종용에서 형태 변이와 지리적 분포 양상

  • Lee, Woong (Research Institute for Dok-do and Ulleung-do Island, Kyungpook National University) ;
  • Jeong, Keum Seon (Division of Forest Biodiversity and Herbarium, Korea National Arboretum) ;
  • Choi, Kyung (Division of Forest Biodiversity and Herbarium, Korea National Arboretum) ;
  • Kim, Jin Seok (Division of Plant Resources, National Institute of Biological Resources) ;
  • Cho, Seong Ho (Natural History Museum, Kyungpook National University) ;
  • Pak, Jae-Hong (Research Institute for Dok-do and Ulleung-do Island, Kyungpook National University)
  • Received : 2016.11.30
  • Accepted : 2016.12.12
  • Published : 2016.12.30
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Abstract

We investigate the intraspecific morphological variations and geographical distributions from twelve populations (28 samples) of Orobanche coerulescens in Korea. Two main morphological types were detected, i.e., glabrous (G-type) and pilose (P-type), in the external morphology (stem, leaf, bract, calyx, and corolla). The G-type was found on Ulleung-do and Dok-do, and the P-type was observed on the coasts of South Korea, Jeju-do and Ulleung-do. The distinct difference in the morphological types and geographical distribution suggested the existence of two putative lineages with different distribution processes. O. coerulescens, distributed in very limited areas, was only identified as the G-type on Dok-do. Hence, conservation efforts should focus on protecting native habitats to conserve native species and the unique biogeographic significance of this species.

한국내의 초종용은 한반도의 서해, 남해, 동해의 해안가 및 도서지역에 제한적으로 분포한다. 본 연구는 울릉도와 독도를 중심으로 12개 자생지에서 초종용의 종내 형태형질 변이를 관찰하고 지리적 분포 양상을 조사하였다. 그 결과, 외부 형질(줄기, 잎, 포엽, 꽃받침 그리고 화관)에서 털의 유무에 의하여 두 개의 type (G-type, glabrous; P-type, pilose)을 확인하였다. 확인된 두 개의 형태학적 type은 확인된 자생지에서 뚜렷한 지리적 분포 양상을 보여주었다. 한반도와 제주도에는 P-type, 울릉도에는 G-type과 P-type 그리고 독도의 동도에는 G-type만이 관찰되었다. 초종용은 외부 형태 형질에 의하여 서로 다른 두 개의 type이 확인되고 뚜렷한 지리적 분포 양상을 보여주기 때문에, 털이 없어지는 형태적 변이가 단순히 일시적인 우연의 결과물이 아니라 초종용 내에 이주 및 군체 형성의 과정을 동반하는 진화적으로 서로 다른 계통이 있음을 추정할 수 있다. 제한된 지역에서 분포하는 독도의 초종용은 유일하게 G-type 으로 확인되었으며 이는 독도 자생종의 의미와 함께 중요한 식물지리학적 가치를 가지고 있기 때문에 자생지 보전을 위한 노력이 필요하다.

Keywords

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