KSCE Journal of Civil and Environmental Engineering Research (대한토목학회논문집)

Korean Society of Civil Engeneers (대한토목학회)
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The Effects of Cadmium on Seed Germination and Growth of Sunflower and Rape

카드뮴이 해바라기와 유채 발아 및 성장에 미치는 영향

  • 이광근 (서울대학교 공과대학 건설환경공학부) ;
  • 조한상 (한국환경산업기술원) ;
  • 김재영 (서울대학교 공과대학 건설환경공학부)
  • Received : 2009.12.07
  • Accepted : 2009.12.15
  • Published : 2010.02.28
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Abstract

Sunflower (Sunking4505) and Rape (Sunmang) are oil-seeds containing high oleic acid, and these are used for the production materials of bio-diesel and applying for phytoremediation. The effect of cadmium on germination rate and the growth of the plants is evaluated. Object seeds were placed in Cd (0, 1.5, 4, 12, 30, 60, 100, 150, 300, 500 mg/L) solutions for seven days, and germination rate, root length, shoot length, seedling length, and dry weight were observed. $IC_{50}$, seedling vigor index, and tolerance indices were computed, and data were statistically analyzed by Analysis of Variance (ANOVA). Germination rate as well as root, shoot, and seedling length decreased as the cadmium concentration increased except dry weight. The $IC_{50}$ of sunflower and rape are 112 and 10 mg-Cd/L, respectively. Only one of the sunflower seeds is germinated at 500 mg-Cd/L whereas rape seeds are not germinated more than 150 mg-Cd/L solution. Root has higher cadmium sensitivity than shoot, and sunflower has higher germination rate, growth, and seedling vigor index than rape. In case of tolerance indices, sunflower has lower value than rape at relatively low concentration, but has higher value at high concentration.

해바라기(Sunking4505)와 유채(선망)는 고농도 올레인산을 함유한 유지종으로 바이오디젤 생산 원료로 사용되며, 식물정화공법(phytoremediation)에 사용되는 대표적 식물종이다. 본 연구는 이 식물종을 이용하여 카드뮴이 발아율 및 생육량에 미치는 영향을 평가하였다. 대상 식물종의 씨앗은 카드뮴용액(0, 1.5, 4, 12, 30, 60, 100, 150, 300, 500 mg/L)에서 7일간 배양 후 발아율, 유근과 지상부, 유묘 길이, 건조중량을 측정하였으며, 이를 이용하여 $IC_{50}$, 식물활성도, 내성지수를 구하였다. 또, 각 데이터는 분산분석(ANOVA)를 사용하여 유의성을 검증하였다. 건조중량을 제외한 발아율과 생육량은 카드뮴 농도가 증가함에 따라 감소하였다. 해바라기와 유채의 $IC_{50}$은 112, 10 mg-Cd/L이고, 해바라기씨는 500 mg-Cd/L에서 1개만 발아하였고, 유채씨는 150 mg-Cd/L 이상의 농도에서는 발아하지 못하였다. 대상 식물의 뿌리는 지상부보다 카드뮴에 대해 높은 민감도를 보였다. 해바라기의 발아율과 생육량, 식물활성도는 유채보다 높은 값을 가졌고, 내성지표는 상대적으로 저농도에서 유채보다 낮은 값을 가졌으나, 높은 농도에서는 유채가 발아하지 못해 높은 값을 보였다.

Keywords

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