식물의 수분 스트레스 조기 탐지
Early Detection of Plant Water Stress
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초록
외형적인 증상이 나타나기 전에 수분 스트레스의 조기 탐지가 가능한지를 알아보기 위해 가뭄에 노출하여 성장시킨 Arabidopsis thaliana와 Glycine max의 형태적 변화, 엽록소 농도, 엽록소 형광 및 반사율을 분석해 보았다. 시듦, 줄기 가늘어짐 및 잎 말림을 포함하는 형태적 변화가 가뭄 노출 5일 째부터 일어나는 반면 잎의 국부적인 엽록소 농도 증가와 엽록소 형광 및 500~600nm 영역에서의 반사율 저하는 가뭄 노출 2일째부터 나타났다. 본 실험 결과는 수분 스트레스가 형태적인 증상들이 나타나기 전에 일시적으로 엽록소 농도를 증가시키며 엽록소 형광과 반사율은 감소시킴을 보여준다. 본 실험에서 사용된 빛과 관련된 생리적 지표들은 식물이 물 부족을 언제 느끼며, 우리가 언제 물을 줘야 식물의 피해를 최소화하여 생산성 감소를 줄일 수 있는지를 알려줄 것이다.
Abstract
To detect the water stress early before the appearance of morphological stress symptoms, the morphological changes, chlorophyll content, chlorophyll fluorescence and spectral reflectance of leaves were analyzed in Arabidopsis thaliana and Glycine max growing in water stress conditions. While the morphological changes including wilting, stem thinning and leaf rolling appeared clearly after 5 days exposure to drought, the increase of chlorophyll content and the decrease of chlorophyll fluorescence and spectral reflectance at 450-700 nm wavelength of leaves appeared after 3 days exposed to drought. The results obtained in this study indicate that drought enhances local chlorophyll content temporarily and reduces chlorophyll fluorescence and spectral reflectance early before the appearance of morphological changes. The light-related physiological parameters used in this experiment might tell us when the plants feel thirsty and could be used for us to decide when the water supply is not too late to minimize plant damage and to reduce yield loss.
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