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차광처리가 제비붓꽃의 생장 및 생리적 특성에 미치는 영향

Changes in Growth and Physiological Characteristics of Iris laevigata Fisch. by Shading Treatment

정은주|윤정원|김동학|조승주
한국자원식물학회 (The Plant Resources Society Of Korea)|2024.04|한국자원식물학회지 (Korean Journal of Plant Reources.)|제37권 제2호|pp. 203-213|DOI 10.7732/kjpr.2024.37.2.203

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참고문헌

키워드

PhotosynthesisChlorophyllNorth lineage plantPlant propagationCO2 assimilation rate

초록

본 연구에서는 북방계 식물 제비붓꽃의 현지외 보전에 필요한 생육 적정 광조건을 제시하기 위하여 차광처리에 따른 제비붓꽃의 생장과 생리적 반응을 조사하였다. 전천광을 수광하는대조구와 서로 다른 차광처리구(50%, 75%, 95%)를 설치하고 엽면적당 건중량, 엽록소 함량과 형광 반응, 광합성 특성을 조사하였다. 제비붓꽃은 차광수준이 강해질수록 낮은 광도에 적응하기 위하여 광합성 효율이 높아진 잎이 형성되었다. 차광수준이 높아질수록 엽록소 함량이 증가하였고, 엽면적이 증가하면서 엽면적당 건중량은 감소하였다. 차광처리에 의해 엽록소 형광 반응 Fv/Fm과 NPQ는 변화하지 않았고, 탄소고정계의 활성또한 처리 간에 차이가 없었다. 제비붓꽃은 양지식물에 해당하는 광포화점을 나타냈고, 75% 차광수준까지 광합성 능력을 대조구와 비슷한 수준으로 유지하였다. 제비붓꽃의 순양자수율은 95% 차광처리에서 현저히 감소하여 낮은 광조건에 적응한상태를 보였다. 제비붓꽃은 전천광 대비 95% 차광수준에서 생육할 시 광합성 능력이 저하하는 것으로 보이며, 차광 상태를 지속하여 광을 제한할수록 생육이 불리할 것으로 판단된다.

Abstract

In this study, we investigated the growth and physiological responses of Iris laevigata Fisch. to shading treatments in order to suggest optimal light conditions for ex-situ conservation of the northern lineage plants. For this purpose, a control plant receiving full sunlight and different shading treatments (50%, 75%, 95%) were installed, and leaf mass per area, chlorophyll content and fluorescence response, and photosynthetic characteristics were investigated. I. laevigata developed leaves with higher photosynthetic efficiency to adapt to lower light intensity as shading levels increased. Chlorophyll content increased with increasing shading levels, and leaf mass per area decreased with increasing leaf area. The chlorophyll fluorescence responses Fv/Fm and NPQ did not change with shading, and the activity of the carbon fixation system did not differ between treatments. I. laevigata exhibited a light-saturation point equivalent to that of sun plants and maintained photosynthetic capacity similar to that of controls up to 75% shading. The apparent quantum yield of I. laevigata decreased significantly at 95% shading, indicating adaptation to lower light conditions. It seems that the photosynthetic capacity of I. laevigata decreases when grown under 95% shading level compared to full sunlight, and it is judged that the longer the light is restricted by continuous shading, the more unfavorable the growth will be.

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