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KMID : 1098420200280060412
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Korean Journal of Medicinal Crop Science
2020 Volume.28 No. 6 p.412 ~ p.420
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Effect of Soil Water and Shading Treatment on Chlorophyll Fluorescence Parameters and Photosynthetic Capacity in Cnidium officinale Makino
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Kim Kwang-Seop
Seo Young-Jin
Kim Dong-Chun
Nam Hyo-Hoon
Lee Bu-Yong
Kim Jun-Hyung
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Abstract
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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.
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KEYWORD
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Cnidium officinale Makino, Chlorophyll Fluorescence, Photosynthetic Capacity, Soil Water
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