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토양 수분 스트레스와 차광 처리가 천궁의 엽록소 형광반응 및 광합성에 미치는 영향

Effect of Soil Water and Shading Treatment on Chlorophyll Fluorescence Parameters and Photosynthetic Capacity in Cnidium officinale Makino

한국약용작물학회지 2020년 28권 6호 p.412 ~ 420
김광섭, 서영진, 김동춘, 남효훈, 이부용, 김준형,
소속 상세정보
김광섭 ( Kim Kwang-Seop ) - GBARES Bonghwa Herbal Crop Research Institute
서영진 ( Seo Young-Jin ) - GBARES Bonghwa Herbal Crop Research Institute
김동춘 ( Kim Dong-Chun ) - GBARES Bonghwa Herbal Crop Research Institute
남효훈 ( Nam Hyo-Hoon ) - GBARES Bonghwa Herbal Crop Research Institute
이부용 ( Lee Bu-Yong ) - Catholic University of Daegu Department of Environmental
김준형 ( Kim Jun-Hyung ) - Kyungpook National University School of Applied Biosciences

Abstract


Background: Measurement of chlorophyll fluorescence (CF) is useful for detection the ability of plants to tolerate environmental stresses such as drought, and excessive sunlight. Cnidium officinale Makino is highly sensitive to water stress and excessive sunlight. In this study, we evaluated the effect of soil water and shade treatment on the photosynthesis and leaf temperature change of C. officinale.

Methods and Results: C. officinale was cultivated under uniform irrigation for 1 week drought stress (no watering) for 6 days. A significant decrease in CF was observed on the 5th day of withholding water (approximately 6% of soil water content) regardless of shading. Notably, the Rfd_lss parameter (CF decrease rates) with and without shade treatment was reduced by 73.1% and 56.5% respectively, at 6 days compared with those at the initial stage (0 day). The patterns of the degree of CF parameters corresponded to those of the soil water content and difference between leaf temperature (Ts) and air temperature (Ta). Meanwhile, CF parameters recovered to the 3 - 4 days levels after re-watering, while the soil water potential was completely restored. The suitable soil water content for C. officinale optimal growth was between -5 ㎪ and -10 ㎪ in this experiment.

Conclusions: Lack of soil water in the cultivation of C. officinale, even with shading, decreased latent heat cooling through transpiration. As a result, heat dissipation declined, and the plant was subjected to drought stress. Soil water content plays a major role in photosynthesis and leaf temperature in C. officinale.

키워드

Cnidium officinale Makino; Chlorophyll Fluorescence; Photosynthetic Capacity; Soil Water

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