Korean Journal of Plant Taxonomy (식물분류학회지)

The Korean Society of Plant Taxonomists (한국식물분류학회)
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Chromosome numbers of Carex section Siderostictae from Korea populations (Cyperaceae)

한국산 사초과 대사초절의 염색체 수

  • 정경숙 (중원대학교 한방소재산업학과) ;
  • 양종철 (국립수목원 산림생물조사과) ;
  • 이유미 (국립수목원 산림생물조사과)
  • Received : 2012.12.18
  • Accepted : 2013.03.02
  • Published : 2013.03.29
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Abstract

We report somatic chromosome numbers 2n = 12 for three Carex sect. Siderostictae Franch. ex Ohwi (Cyperaceae) from Korean populations: Carex ciliatomarginata Nakai, C. okamotoi Ohwi, and C. siderosticta Hance. This study is the first chromosome number report for the species C. ciliatomarginata from Korean populations. As found in other Carex species, all the chromosomes examined in the section exhibit nonlocalized centromere (polycentric or holocentric) and large (more than ca. $1{\mu}m$ long) chromosomes. Considering the basal phylogenetic position of the section in tribe Cariceae Pax, small numbers of large chromosomes have been hypothesized as primitive characters in Cariceae, and our observation supports the hypothesis. Further investigations of chromosomes in Carex are needed for a better understanding of species richness in the genus.

한국산 사초과 Carex sect. Siderostictae Franch. ex Ohwi(대사초절, 3종), Carex ciliatomarginata Nakai(털대사초), C. okamotoi Ohwi(지리대사초), and C. siderosticta Hance(대사초)의 염색체 수를 2n = 12으로 밝힌다. 본 연구에서 한반도 자생 C. ciliatomarginata의 염색체 수를 최초로 보고한다. 해외의 다른 사초속 식물에서 보고된 바와 같이, 관찰된 모든 염색체에서 응축된 동원체가 관찰되지 않았으므로 크기는 다른 종들에서 관찰된 것보다는 길었다($1{\mu}m$이상). 대사초절의 종들도 모두 전부염색체(全部染色體, holocentric chromosome)를 가지며, 본 절이 tribe Cariceae Pax(사초족)에서 가장 먼저 분화된 분류군임을 감안할 때, 염색체 수가 적고(보고된 사초속 염색체 수의 변이 2n = 12 - 132) 크기가 큰 염색체가 Cariceae에서 원시적인 형질로 여겨진다. 사초속의 종 다양성에 크게 기여한 것으로 알려진 염색체 종 분화에 대한 이해를 위하여 한반도에 자생하는 사초속을 대상으로 하는 지속적인 세포학적 연구가 요구된다.

Keywords

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