Korean Journal of Agricultural and Forest Meteorology (한국농림기상학회지)

Korean Society of Agricultural and Forest Meteorology (한국농림기상학회)
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Physiological Differences of Ilex rotunda and Illicium anisatum under Low Light Intensities

다른 광도에서 생육한 먼나무, 붓순나무의 생리적 차이

  • Son Seog-Gu (Warm-temperature Forest Research Center, Korea Forest Research Institute) ;
  • Je Sun-Mi (University of Seoul, Department of Environmental horticulture) ;
  • Woo Su-Young (University of Seoul, Department of Environmental horticulture) ;
  • Byun Kwang-Ok (Korea Forest Research Institute, Department of Forest Genetics Resources) ;
  • Kang Young-Je (Warm-temperature Forest Research Center Korea Forest Research Institute) ;
  • Kwang Byung-Seo (Warm-temperature Forest Research Center Korea Forest Research Institute)
  • 손석규 (국립산림과학원 난대산림연구소) ;
  • 제선미 (서울시립대학교 환경원예학과) ;
  • 우수영 (서울시립대학교 환경원예학과) ;
  • 변광옥 (국립산림과학원 유전자원부) ;
  • 강영제 (국립산림과학원 난대산림연구소) ;
  • 강병서 (국립산림과학원 난대산림연구소)
  • Published : 2006.06.01
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Abstract

We examined seedlings of two species (Ilex rotunda and Illicium anisatum) which have a different level of shade tolerance and raised them under different light regimes (full sunlight and 50% shading). After 12 months, we investigated chlorophyll content (Chl. a, Chl. b and Chl. a+b), photosynthetic systems (photosynthetic rate, light compensation point, dark respiration rate and quantum yield), intercellular $CO_2$ concentration and water use efficiency to show acclimation reaction to different light conditions. Seedlings grown under full sunlight showed lower chlorophyll content than those in the shading regime. There was a significant difference between the full sunlight and shade treatments in I. anisatum (shade tolerance species). I. rotunda (intermediate species) showed high photosynthetic rate and water use efficiency over PPFD $1000\;{\mu}mol\;m^{-2}s^{-1}$ to full sunlight. Also, I. anisatum grown under full sunlight showed lower photosynthetic rate and water use efficiency over a range of all PPFD. This result showed that I. rotunda has a more flexible reaction system than that of I. anisatum.

내음성정도가 서로 다른 두 수종 먼나무와 붓순나무를 대상으로 높은 광도조건인 자연상태와 낮은 광도 조건인 비음 처리구로 나누어, 두 수종간의 적응 반응을 비교하였다. 두 수종의 묘목을 처리구에서 각각 1년간 비음처리하였을 때, 엽록소함량과 광합성계, 엽육세포내 $CO_2$농도, 수분이용효율의 특성을 조사하였다. 엽록소 함량은 두 수종모두 자연조건(full sunlight)일 때, 비음처리구에 비하여 낮은 엽록소 함량들(Chl a, Chl b, Chl a+b)을 나타냈으며, 붓순나무에서 특히 자연조건과 비음 처리구간의 엽록소 함량의 차이가 크게 나타났다. 한편, 중용수인 먼나무는 PPFD $1000\;{\mu}mol\;m^{-2}s^{-1}$ 이상 일 때, 자연조건(full sunlight)에서 높은 광합성율과 높은 수분이용효율을 보였지만, PPFD $1000\;{\mu}mol\;m^{-2}s^{-1}$ 이하에서는 비음처리구에서 자연조건에 비해 더 높은 광합성율과, 수분이용효율을 나타냈다. 이에 반해 붓순나무는 모든 광도에서 비음처리를 하지 않은 묘목이 비음처리를 한 묘목에 비해 낮은 광합성율과 수분이용효율을 나타냈다. 먼나무가 탄력적으로 광도변화에 따라 유동성 있는 반응을 보이는 것에 비해 내음성이 강한 붓순나무는 광환경 변화에 따른 민감성이 낮게 나타나는 것을 알 수 있었다.

Keywords

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