Korean Journal of Agricultural and Forest Meteorology (한국농림기상학회지)

Korean Society of Agricultural and Forest Meteorology (한국농림기상학회)
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Stomatal and Photosynthetic Responses of Betula Species Exposed to Ozone

오존에 노출된 자작나무류의 기공개폐와 광합성 반응

  • 이재천 (국립산림과학원 산림유전자원부) ;
  • 김장수 (국립산림과학원 산림유전자원부) ;
  • 한심희 (국립산림과학원 산림유전자원부) ;
  • 김판기 (서울대학교 기초과학연구원)
  • Published : 2004.03.01
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Abstract

This study was conducted to determine the relationship of stomatal responses, photosynthesis, and intercellular $CO_2$ concentration( $C_{i}$) of Betula Species to ozone exposure. Five Betula Species(B. costata, B. davurica, B. schmidtii, B. platyphylla var, iaponica and B, ermani) were grown in the greenhouse. One-year-old potted seedlings of the five Betula Species were exposed to ozone(100 pub) for 8 hours da $y^{-1}$ for 5 weeks in a fumigation chamber. Net photosynthesis was significantly different among species and treatments from early in the period of the fumigation. Stomatal conductance and transpiration rate differences among species and treatments became significant after three weeks of fumigation. $C_{i}$ was significantly different only among treatments; $C_{i}$ of four species, except for B. davurica, was higher than that of control plants. Carboxylation efficiency and photo-respiration rate were significantly different among species or treatments; carboxylation efficiency and photo-respiration rate of the five Betula Species were decreased by ozone treatment. It was concluded that stomatal closure of Betula Species may be the result of the reduction of photosynthesis and rubisco activity and the resulting increase of $C_{i}$. The higher $C_{i}$ likely resulted from reduced photosynthesis because of physiological processes.ocesses.

본 연구는 오존에 노출된 자작나무류의 기공 반응, 광합성 및 내부 $CO_2$ 농도 변화간의 연관성을 밝히고자 수행하였다. 거제수나무, 물박달나무, 박달나무, 자작나무, 사스래나무는 온실에서 양묘하여 포트로 옮겨 심고, 100ppb의 오존 농도에서 하루 8시간씩 5주 동안 오존에 노출시켰다. 순광합성은 오존 노출 초기부터 수종간, 처리간 차이가 있었으나, 기공전도도와 증산량은 오존 처리 3주 후부터 수종간, 처리간 차이가 있었다. 내부 $CO_2$ 농도는 수종간 차이가 없었으나, 처리간 차이는 크게 나타났으며, 물박달나무를 제외한 4개 수종의 내부 $CO_2$ 농도는 오존 처리구가 대조구보다 높았다. 탄소고정효율과 광호흡속도는 수종간 또는 처리간에 큰 차이를 나타냈으며, 모든 수종에서 대조구보다 오존 처리구가 낮았다. 자작나무류는 장기적인 오존 노출로 광합성과 관련된 rubisco 활성이 감소하여, 내부 $CO_2$ 농도가 증가하면서 기공이 eke히는 것으로 판단된다.

Keywords

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