Korean Journal of Agricultural and Forest Meteorology (한국농림기상학회지)

Korean Society of Agricultural and Forest Meteorology (한국농림기상학회)
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Physiological Response and Growth Performance of Parasenecio firmus under Different Shading Treatments

차광처리에 따른 병풍쌈의 생리반응 및 생장특성

  • Lee, Kyeong-Cheol (Department of Forest Resources, College of Forest and Environmental Sciences, Kangwon National University) ;
  • Lee, Hak-Bong (Department of Forest Resources, College of Forest and Environmental Sciences, Kangwon National University) ;
  • Park, Wan-Geun (Department of Forest Resources, College of Forest and Environmental Sciences, Kangwon National University) ;
  • Han, Sang-Sup (Department of Forest Resources, College of Forest and Environmental Sciences, Kangwon National University)
  • 이경철 (강원대학교 산림환경과학대학 산림자원학과) ;
  • 이학봉 (강원대학교 산림환경과학대학 산림자원학과) ;
  • 박완근 (강원대학교 산림환경과학대학 산림자원학과) ;
  • 한상섭 (강원대학교 산림환경과학대학 산림자원학과)
  • Received : 2012.01.09
  • Accepted : 2012.06.01
  • Published : 2012.06.30
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Abstract

This study was conducted to investigate the chlorophyll contents, photosynthetic characteristics, chlorophyll fluorescence, and growth performance of Parasenecio firmus under changing light environment. Parasenecio firmus was grown under non-treated (full sunlight) and three different shading conditions (88~93%, 65~75% and 45%~55% of full sunlight) for the experiment. Total chlorophyll content, photochemical efficiency (Fv/Fm), T/R ratio, specific leaf area (SLA), leaf area ratio (LAR), and leaf weight ratio (LWR) were increased with increasing shading level, but decreased dark respiration. Therefore, light absorption and light utilization efficiency were improved under the low intensity light. Plants under 65~75% of full sunlight had best maximum photosynthetic rate and net apparent quantum yield in May. On the other hand, the non-treated plants had lower maximum photosynthetic rate, photochemical efficiency, and chlorophyll content than the treated ones. Parasenecio firmus considered to be a sciophyte, is fairly sensitive to high intensity light. If 88-93% of full sunlight lasts for a long period, photosynthetic capacity will be sharply decreased, though limiting light. These results suggest that growth of Parasenecio firmus adapted to 65~75% of full sunlight.

본 연구는 광환경 변화에 따른 병풍쌈의 엽록소 함량, 광합성 특성, 엽록소형광반응 그리고 생장 특성을 조사하기 위해 실시하였으며, 실험을 위해 병풍쌈을 무처리구(full sunlight)와 3개의 서로 다른 피음조건(88~93%, 65~75% and 45%~55% of full sunlight)에서 생육시켰다. 병풍쌈은 피음수준이 증가할수록 총 엽록소 함량, 광화학반응효율, T/R율, SLA, LAR, LWR은 증가하고 암호흡은 감소하여, 낮은 광조건에서 빛의 흡수량과 광합성에 대한 이용효율을 높이는 반응을 나타냈다. 5월의 중피음처리구에서 가장 높은 최대광합성속도와 순양자수율을 나타냈으며, 피음처리구보다 전광처리구에서 가장 낮은 최대광합성속도, 광화학반응효율, 엽록소 함량을 나타냈다. 위의 결과에 따라 병풍쌈은 음지식물로 강한 광에 대한 민감성이 매우 높고, 광을 제한하여도 강피음 상태를 지속하게 되면 광합성 능력이 크게 감소될 수 있으며, 건전한 생육을 위해서는 노천광의 65~75%를 차단시킨 광환경 조건이 적합하다고 생각된다.

Keywords

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