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NTIS 바로가기생물환경조절학회지 = Journal of bio-environment control, v.19 no.1, 2010년, pp.36 - 48
김길남 (충남대학교 산림자원학) , 조민석 (국립산림과학원 산림생산기술연구소) , 이수원 (국립산림과학원 산림생산기술연구소)
This present study was conducted to investigate photosynthetic characteristics, chlorophyll fluorescence, chlorophyll contents of Betula platyphylla var. japonica, Prunus leveilleana, Magnolia sieboldii, growing under four different light intensity regimes (full sun, and 64~73%, 35~42%, 9~16% of ful...
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핵심어 | 질문 | 논문에서 추출한 답변 |
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임상의 광 환경에서 내음성이 높은 수종은 어떠한 변화를 나타내는가? | 임상의 광 환경에서는 내음성 수준이 낮은 수종은 엽록소함량이 감소하고, 빛 흡수율과 광합성의 저하로 생장이 불량하게 된다(Kim 등, 2001; Kim과 Lee, 2001b). 반면 내음성이 높은 수종 또는 중용수는 잎의 두께가 얇아지고, 면적이 넓어지는 형태적 변화가 나타나 수광량이 증대된다(Kwon 등, 1996). 그리고 생장에 필요한 에너지를 생산하는 광합성에서는 암반응을 담당하는 탄소고정계의 효소와 활성이 저하하며, 명반응을 담당하는 광화학계의 색소와 활성이 증가하는 생화학적 변화가 나타나, 광합성에 대한 흡수된 빛의 이용 효율이 증가된다. 이러한 현상은 낮은 광도조건에 적응하여 생존할 수 있는 내음성의 기작이 된다(Terasima와 Hikosaka, 1995). | |
임상의 광 환경에서 내음성 수준이 낮은 수종은 어떠한 변화가 발생하는가? | 임상의 광 환경에서는 내음성 수준이 낮은 수종은 엽록소함량이 감소하고, 빛 흡수율과 광합성의 저하로 생장이 불량하게 된다(Kim 등, 2001; Kim과 Lee, 2001b). 반면 내음성이 높은 수종 또는 중용수는 잎의 두께가 얇아지고, 면적이 넓어지는 형태적 변화가 나타나 수광량이 증대된다(Kwon 등, 1996). | |
빛의 이용효율에 영향을 미치는 요소는? | 또한 광도변화에 대한 형태적·생화학적 변화는 광합성 특성을 나타내는 광-광합성곡선에 반영되어, 암호흡속도, 광보상점, 광포화점, 최대광합성 속도, 순양자수율(apparent quantum yield)을 변화시킨다(Kim과 Lee, 2001a; Terashima와 Evans, 1988). 그리고 빛의 이용효율에 영향을 미치는 엽록소 형광반응과 엽록소 a, b의 함량 및 이들의 성분비 변화를 초래한다(Kim과 Lee, 2001b). 따라서 광도저하에 대한 광합성 특성과 광합성색소의 함량변화는 수목의 내 음성 수준을 나타내는 하나의 지표가 된다(Woo 등, 1999; Kimmins, 1997). |
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