정선황기의 세포유전학적 연구 = A cytogenetic study of Astragalus koraiensis Y. N. Lee

다국어 초록 (Multilingual Abstract)

This study was carried out to determine the karyotype and chromosomal localizations of 45S and 5S rDNAs using FISH in Astragalus koraiensis. The somatic metaphase chromosome number of this species was 2n = 16 with basic chromosome number of x = 8. The karyotype of A. koraiensis was consisted of six pairs of median region chromosomes(chromosome 1, 3, 4, 5, 6, 8) and two pairs of submedian chromosomes(chromosome 2, 7). Based on the FISH, one pair of 45S rDNA site was detected on the centromeric region of chromosome 5. Whereas, two pair of 5S sites were detected on the short arm of chromosome 4 and centromeric region of chromosome 7, respectively. These are quite different patterns from A. membranaceus, A. membranaceus var. alpinus, and A. mongholicus. Although A. koraiensis is considered as Korean endemic species, therefore, it should be conducted out comparative FISH study with A. sikokianus and A. bhotanensis which are very similar to A. koraiensis morphologically.

국문 초록 (Abstract)

국내에 자생하는 황기속(Astragalus L.) 식물인 정선황기(A. koraiensis)의 핵형을 분석하고, 5S 및 45S rDNA 유전자를 이용한 FISH 실험에 기초하여 세포유전학적 연구를 수행하였다. 핵형 분석 결과, 정선황기의 체세포 염색체수는 2n = 16으로, 기본 염색체수는 x = 8임을 확인하였다. 염색체 조성은 6쌍의 중부염색체(염색체 1, 3, 4, 5, 6, 8)와 2쌍의 차중부염색체(염색체 2, 7)로 구성되었다. 정선황기의 염색체상에서의 FISH 결과, 1쌍의 45S rDNA signal이 5번 염색체의 동원체 부위에서 관찰되었고, 2쌍의 5S rDNA signal이 4번 염색체의 단완 말단부위와 7번 염색체의 동원체 부위에서 관찰되었다. 이는 기존의 황기 및 제주황기, 몽골황기(A. mongholicus) 와는 전혀 다른 FISH 패턴을 보이고 있어 정선황기가 고유종임을 암시하지만, 형태학적으로 유사한 갯황기(A. sikokianus) 및 A. bhotanensis 와의 비교연구를 수행하여 정확한 분류학적 처리가 이루어져야 할 것이다.

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