Korean Journal of Agricultural and Forest Meteorology (한국농림기상학회지)

Korean Society of Agricultural and Forest Meteorology (한국농림기상학회)
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Changes on Initial Growth and Physiological Characteristics of Larix kaempferi and Betula costata Seedlings under Elevated Temperature

온도 증가에 따른 일본잎갈나무와 거제수나무 유묘의 초기 생장과 생리 특성의 변화

  • Han, Sim-Hee (Department of Forest Genetic Resources, Korea Forest Research Institute) ;
  • Kim, Du-Hyun (Department of Forest Genetic Resources, Korea Forest Research Institute) ;
  • Kim, Gil-Nam (Department of Forest Genetic Resources, Korea Forest Research Institute) ;
  • Lee, Jae-Cheon (Department of Forest Genetic Resources, Korea Forest Research Institute) ;
  • Yun, Chung-Weon (Department of Forest Resource, Kongju National University)
  • 한심희 (국립산림과학원 산림유전자원부) ;
  • 김두현 (국립산림과학원 산림유전자원부) ;
  • 김길남 (국립산림과학원 산림유전자원부) ;
  • 이재천 (국립산림과학원 산림유전자원부) ;
  • 윤충원 (국립공주대학교 산림자원학과)
  • Received : 2011.11.24
  • Accepted : 2012.06.01
  • Published : 2012.06.30
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Abstract

Larix kaempferi and Betula costata seedlings were grown under an elevated temperature ($27^{\circ}C$) for four weeks to understand initial changes on physiological characteristics caused by temperature rising in connection with global warming. At the end of the treatment, growth performance, leaf pigment content, antioxidative enzyme activities and malondialdehyde (MDA) content were measured and analyzed. Relative growth rates of the height of two tree species grown under elevated temperature ($27^{\circ}C$) were lower than those of control ($24^{\circ}C$) and dry weights of leaves, stems and roots were also reduced at higher temperature. Particularly, the root growth reduction of two tree species increased markedly at $27^{\circ}C$ over the study period, which increased the ratio of shoot to root. Under higher temperature, leaf pigment contents decreased, whereas anti-oxidative enzyme activities such as ascorbate peroxidase (APX) and catalase (CAT) increased as compared with the control. But MDA content was not affected by elevated temperature. In conclusion, the elevated temperature leads to root growth reduction, restriction of nutrient uptake from soil and the reduction of leaf pigment contents, which can inhibit the aboveground growth. In addition, higher temperature might act as a stress factor that causes growth reduction through the increase of energy consumption during a growth period.

지구온난화 현상과 관련하여 온도 상승에 따른 수목의 초기 생리 반응 변화를 이해하기 위하여, 일본잎갈나무와 거제수나무 유묘를 $24^{\circ}C$와 $27^{\circ}C$에서 4주간 키운 후, 이들의 생장, 광색소 함량, 항산화효소 활성 및 MDA 함량을 조사 분석하였다. 높은 온도($27^{\circ}C$)에서 생장한 두 수종의 수고 상대생장률은 대조구에 비해 낮았으며, 잎, 줄기, 뿌리의 건중량도 모두 낮았다. 특히 뿌리의 생장 감소는 시간이 지나면서 뚜렷하게 증가하였으며, 이로 인해 지상부와 지하부의 비는 높은 온도에서 증가하였다. 광색소 함량은 두 수종 모두 온도 증가로 감소하였으며, 항산화효소인 APX와 CAT의 활성은 높은 온도에서 증가하였다. 그러나 MDA 함량은 온도 변화에 영향을 받지 않았다. 결론적으로, 수목의 생육 온도 증가는 생육 초기에 뿌리의 생장을 감소시켜 양료 흡수를 제한하며, 엽록소 함량 감소와 지상부의 생장을방해할 수 있다. 또한 온도 증가는 수목의 생장 기간 동안 스트레스 요인으로 작용하여 에너지의 소모를 증가시켜 생장 감소를 초래할 수 있다.

Keywords

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