The Korean Journal of Ecology

The Ecological Society of Korea (한국생태학회)
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Differences in Growth and Photosynthesis among Three Half-sib Families of Betula schmidtii in Response to Cd Treatment

카드뮴 처리에 대한 박달나무의 가계간 생장과 광합성 차이

  • 오창영 (국립산림과학원 산림유전자원부) ;
  • 이경준 (서울대학교 산림자원학) ;
  • 이재천 (국립산림과학원 산림유전자원) ;
  • 한심희 (서울대학교 산림자원학과)
  • Published : 2004.06.01
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Abstract

The objective of this study was to understand differences among three half-sib families of Betula schmidtii seedlings in the effect of three Cd levels on growth and photosynthesis. One-year-old seedlings of B. schmidtii were treated with 0, 0.4 and 0.8 mM CdSO$_4$ㆍ8/3$H_2O$ for two months. Growth and physiological responses to Cd treatment levels of three families determined using dry weight, relative height growth rate(RHGR), apparent quantum yield and carboxylation efficiency. The B. schmidtii seedlings exposed to 0.4 and 0.8 mM Cd showed statisticall significant decrease in dry weight and RHGR relative to controls. In addition, the growth inhibition of B. schmidtii seedlings was accompanied by a significant decrease in net photosynthesis measured as $CO_2$ assimilation. Apparent quantum yield and carboxylation efficiency were also affected by Cd treatment, undergoing a significant and progressive reduction with increasing Cd concentrations in all families. We also found significant difference among three families of B. schmidtii in growth, biomass and photosynthesis when exposed to Cd stress. Therefore the present study showed that the difference in Cd tolerance among families might be attributed to genetic factor in response to Cd stress.

본 연구는 카드뮴 처리에 대한 박달나무 유묘의 가계간 생장 차이와 광합성 특성을 구명하고자 실시하였다. 카드뮴 처리는 3가계의 박달나무 1년생 묘목에 0, 0.4, 0.8mM의 CdSO4 · H2O 용액을 이용하여 3수준으로 2개월간 실시하였다. 박달나무의 가계간 및 처리간 생장과 생리적 반응은 건중량, 상대생장율, 순양자수율 및 탄소고정효율을 이용하여 결정하였다. 0.4 mM과 0.8mM 카드뮴이 처리된 박달나무 유묘는 대조구와 비교해서 건중량과 상대생장율이 크게 감소하였으며, 박달나무 유묘의 생장 감소는 광합성 능력의 감소에 큰 영향을 받은 것으로 나타났다. 또한 순양자수율과 탄소고정효율은 카드뮴 처리로 감소하였으며, 모든 가계에서 카드뮴 농도가 증가함에 따라 감소 폭이 커졌다. 한편 카드뮴 처리에 의한 생장과 광합성 반응은 박달나무 가계간 뚜렷한 차이를 보여 카드뮴 내성은 가계간 유전적 요인이 작용하고 있음을 확인하였다.

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