정원 식물의 차광 조건별 광화학적 생리지표 해석
Photochemical Index Analysis on Different Shading Level of Garden Plants
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초록
본 연구는 엽록소 형광반응 (OJIP)분석을 통해 차광처리에 따른 정원 식물의 광 이용효율을 평가 및 분석하고자 하였다. 10종의 정원식물을 대상으로 50% 및 80% 차광 조건에서 엽록소 형광반응 분석을 실시하였으며, 75일 차광조건에서 가장 낮은 광이용 효율을 보였다. 차광처리 시 광계II 전자전달에너지플럭스 (ET2O/RC)는 증가 경향을 보였으나광계I 전자전달에너지플럭스 (RE1O/RC) 및 PI 등 광이용 효율이 감소하였다. 본 연구를 통하여 광화학 매개변수 중 FV, FV/FO, RE1O/RC, ET2O/RC, PITOTAL ABS, DFTOTAL ABS 등 19개parameter가 광화학 반응의 효율을 나타내는 중요한 요인으로 판단되었다. SFI평가를 통해 10종의 정원식물 중 수호초(Ⅰ), 꽃범의꼬리 (Ⅱ), 무늬사초 (Ⅱ)등 3종의 식물이 내음성이강한 것으로 판단되었다. 따라서 광화학 반응에 근거한 일조스트레스지수 (SFI)는 정원식물의 내음성 평가에 유용한 것으로 사료된다.
Abstract
The objective of this study was to determine the growth and light utilization efficiency of garden plants in shade area through chlorophyll fluorescence reaction analysis. Ten garden plants was grown for 75 days under 50% and 80% shading conditions. Under shading, ET2O/RC, the fluorescence parameter related to electron-transport in photosystem II, was effectively enhanced. However, the electron transport flux until PSI acceptors per reaction center (RE1O/RC) was reduced. These changes in photochemical parameters evoked a decrease in performance index (PI) and driving force (DF) of electron transport flux. In addition, some photochemical parameters such as FV, FV/FO, RE1O/RC, ET2O/RC, PITOTAL ABS, and DFTOTAL ABS were found to be important for shade tolerance. Three species (Pachysandra terminalis Siebold & Zucc, Physostegia virginiana L., and Carex maculata Bott) were found to be shade tolerant. Based on these results, shading factor index (SFI) deduced from photochemical parameters is useful for evaluating of shading stress of garden plants.
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