한국농림기상학회지, 제 6권 제1호(2004) (pISSN 1229-5671, eISSN 2288-1859)
Korean Journal of Agricultural and Forest Meteorology, Vol. 6, No. 1, (2004), pp. 11~17
ⓒ Author(s) 2014. CC Attribution 3.0 License.


오존에 노출된 자작나무류의 기공개폐와 광합성 반응

이재천(1), 김장수(1), 한심희(1), 김판기(2)
(1)국립산렴과학원 산렴유전지원부, (2)서울대학교 기초과학연구원

(2003년 12월 10일 접수; 2004년 02월 13일 수락)

Stomatal and Photosynthetic Responses of Betula Species<
Exposed to Ozone

Jae-Cheon Lee(1), Chang-Soo Kim(1), Sim-Hee Han(1), Pan-Gi Kim(2)
(1)Department of Forest Genetic Resources, Korea Forest Research Institute, Suwon 441-350, Korea
(2)The Research Institute of Basic Sciences, Seoul National University, Seoul 151-742, Korea

(Received December 10, 2003; Accepted February 13, 2004)

ABSTRACT
This study was conducted to determine the relationship of stomatal responses, photosynthesis, and intercellular CO2 concentration( Ci) 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. Ci was significantly different only among treatments; Ci 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 Ci. The higher Ci likely resulted from reduced photosynthesis because of physiological processes.ocesses.

Keyword: net photosynthesis, stomatal conductance, transpiration rate, intercellular concentration, carboxylation efficiency, photo-respiration rate, rubisco

MAIN

적요

본 연구는 오존에 노출된 자작나무류의 기공 반응, 광합성 및 내부 CO2 농도 변화간의 연관성을 밝히고자 수행하였다. 거제수나무, 물박달나무, 박달나무, 자작나무, 사스래나무는 온실에서 양묘하여 포트로 옮겨 심고, 100ppb의 오존 농도에서 하루 8시간썩 5주 동안 오존에 노출시켰다. 순광합성은 오존 노출 초기부터 수종간, 처리간 차이가 있었으나, 기공전도도와 증산량은 오존 처리 3주 후부터 수종간, 처리간 차이가 있었다. 내부 CO2 농도는 수종간 차이가 없었으나, 처리간 차이는 크게 나타났으며, 물박달나무를 제외한 4개 수종의 내부 CO2 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 CO2 농도가 증가하면서 기공이 닫히는 것으로 판단된다.

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