Korean Journal of Plant Resources (한국자원식물학회지)

The Plant Resources Society of Korea (한국자원식물학회)
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Photosynthesis, Chlorophyll Contents and Leaf Characteristics of Ilex rotunda under Different Shading Treatments

비음처리에 따른 먼나무의 광합성, 엽록소 함량 및 엽 특성

  • Han, Jin-Gyu (Ecosystem Engineering, Dep. Life Science, Kyunghee University) ;
  • Son, Seog-Gu (Warm-temperature Forest Research Center, Korea Forest Research Institute) ;
  • Kim, Sea-Hyun (Department of Genetics Forest Resources, Korea Forest Research Institute) ;
  • Kim, Chan-Soo (Warm-temperature Forest Research Center, Korea Forest Research Institute) ;
  • Hwang, Suk-In (Department of Genetics Forest Resources, Korea Forest Research Institute) ;
  • Byun, Kwang-Ok (Warm-temperature Forest Research Center, Korea Forest Research Institute)
  • 한진규 (경희대학교 생태시스템공학) ;
  • 손석규 (국립산림과학원 난대산림연구소) ;
  • 김세현 (국립산림과학원 산림유전자원부) ;
  • 김찬수 (국립산림과학원 난대산림연구소) ;
  • 황석인 (국립산림과학원 산림유전자원부) ;
  • 변광옥 (국립산림과학원 난대산림연구소)
  • Published : 2008.08.30
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Abstract

Two-year-old seedlings of Ilex rotunda were grown under control (full sunlight) and three different shading condition. Those conditions were full sunlight (PPFD 1600${\mu}mol\;m^{-2}\;s^{-1}$), 30% (PPFD 400${\mu}mol\;m^{-2}\;s^{-1}$), 50% (PPFD 250${\mu}mol\;m^{-2}\;s^{-1}$) and 70% treatment (PPFD 100${\mu}mol\;m^{-2}\;s^{-1}$). Total chlorophyll contents were inverse proportion to light intensity. Seedlings under full sunlight showed the highest photosynthetic activity such as photosynthetic rate, intercellular $CO_2$ concentration and water use efficiency. Photosynthetic activity trend was increased at the higher light intensity than the lower treatment over PPFD 500${\mu}mol\;m^{-2}\;s^{-1}$. Especially, seedlings under 70% treatment showed the worst photosynthetic activity at high light intensity. That result was regular for adapted plant in low intensity environment. Leaf area was also inverse proportion to light intensity, while dry weight per leaf area was shown the opposite trend.

4가지 다른 광도조건의 비음처리구에서 2년간 생육한 먼나무 묘목의 총 엽록소 함량은 비음처리 강도가 높아질수록 총 엽록소 함량도 큰 값을 나타냈다. 광합성 특성을 알아보기 위해 조사된 광합성 능력, 엽육내 $CO_2$ 농도, 수분이용효율 모두 무처리에서 가장 높은 광합성 효율을 나타냈으며 비음처리별 비교에서도 광도가 낮아질수록 낮은 광합성 효율을 나타냈다. 특히, 가장 낮은 광도조건인 70% 차광처리구는 높은 광도조건에서 가장 낮은 광합성 효율을 나타냈는데 이는 낮은 광도조건에 순화된 광합성 기구가 높은 광도 조건에 적응하지 못한 결과로 사료된다. 잎의 형태적 특성에서는 광도조건이 낮을수록 큰 엽면적을 나타냈으며 단위면적당 건중량은 무처리에서 가장 큰 값을 나타냈다.

Keywords

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