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Genetic Variation Analysis of Early-heading Plant (Oryza sativa L.) Lines Derived from Gamma-ray Irradiation

방사선조사 유래의 조기출수 식물(Oryza sativa L.) 계통의 유전적 변이 분석

  • Ryu, Jai-Hyunk (Department of Bioresources Science, Sunchon National University) ;
  • So, Hyun-Su (Department of Bioresources Science, Sunchon National University) ;
  • Lyu, Jae-Il (Department of Bioresources Science, Sunchon National University) ;
  • Kwon, Oh-Do (Jeollanam-do Agricultural Research and Extension Services) ;
  • Lee, Young-Il (Advanced Radiation Technology Institute, Korea Atomic Energy Research Institute) ;
  • Jin, Il-Doo (Department of Plant Medicine, Sunchon National University) ;
  • Lee, Hyo-Yeon (Faculty of Biotechnology, Jeju National University) ;
  • Bae, Chang-Hyu (Department of Bioresources Science, Sunchon National University)
  • 류재혁 (순천대학교 웰빙자원학과) ;
  • 소현수 (순천대학교 웰빙자원학과) ;
  • 류재일 (순천대학교 웰빙자원학과) ;
  • 권오도 (전라남도 농업기술원) ;
  • 이영일 (한국원자력연구원 정읍방사선과학연구소) ;
  • 진일두 (순천대학교 식물의학과) ;
  • 이효연 (제주대학교 생명공학부) ;
  • 배창휴 (순천대학교 웰빙자원학과)
  • Received : 2012.01.13
  • Accepted : 2012.02.15
  • Published : 2012.02.29

Abstract

This study was carried out to evaluate genetic variation of early-heading rice (Oryza sativa L. cv. Dongjin 1) lines derived from gamma-ray ($^{60}Co$, 300 Gy) irradiation. The average heading date of the 5 early-heading lines in $M_7$ and $M_8$ generation was faster than that of untreated control as 11 (line ${\gamma}$-2), 10 (line ${\gamma}$-5), 6 (${\gamma}$-1 line), 5 (${\gamma}$-3) and 4 days (line ${\gamma}$-4), respectively. According to ISSR analysis, polymorphic rate of the early-heading lines (from 5.9% to 23.4%) was higher than that of control (4.3%). The result indicates that the gamma-ray promote variation at DNA level. When genetic variations of rps16-trnK region were evaluated by nucleotide analysis, nucleotide length of the rps16-trnK region was 664 bp in all the early-heading lines and control. Out of 5 sites of nucleotide transposition detected in the region, however, 2 sites were appeared only in the early-heading lines.

식물유전자원의 소재를 확대하고자 동진 1호 벼의 건조 종자에 감마선($^{60}Co$, 300 Gy)을 조사하여 선발한 조기출수 계통의 유전적 변이성을 분석하였다. 선발한 조기출수 계통의 $M_7$(2010년)과 $M_8$(2011년) 세대에서 평균 출수기는 대조품종인 동진 1호(중만생종) 보다 각각 11일(${\gamma}$-2 계통), 10일(${\gamma}$-5 계통), 6일(${\gamma}$-1 계통), 5일(${\gamma}$-3 계통), 4일(${\gamma}$-4 계통)이 빠르게 나타났다. ISSR 분석 결과, 선발계통의 유전적 다형성은 ${\gamma}$-2 계통 5.9%, ${\gamma}$-1 계통 7.5%, ${\gamma}$-4 계통 15.1%, ${\gamma}$-3 계통 15.3%, X-1 계통 19.4%, ${\gamma}$-5 계통 23.4%로 대조품종의 4.3% 보다 높게 나타나 방사선 조사로 DNA 수준에서 변이가 증가되었음을 확인하였다. 엽록체 DNA(rps16-trnK 영역) 분석 결과, 염기 길이는 대조 품종과 같은 664 bp인 반면, 총 5개 염기서열 영역에서 치환 변이가 발생하였고 그 중 6 bp 및 587 bp 영역의 변이는 선발 계통에서만 나타났다.

Keywords

References

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