Background : Heat stress induced from high temperature are known to crucially affecting on physiological properties and yield in Cnidium officinale. Methods and Results : The effect of foliar application of mixture including a urea, ascorbic acid and calcium chloride on high temperature injury of Cnidium officinale. Photosynthesis and leaf temperature in Cnidium officinale were investigated after cultivating for 24 hours at 35℃. Net photosyntheis rate, transpiration was measured at 1,000 μmol m-2 s-1 of photon flux density and leaf temperature was analyzed by thermal image. Net photosyntheis rate, stomatal conductance and transpiration rate in mixture traetment were 2 times of higher than in control. Water use efficience was not different significantly. Leaf temperature was lower in mixture treatment (25.3℃) than in control (29.0℃). Conclusion : This result show that foliar application of urea, ascorbic acid and calcium chloride was reducing a high temperature injury through a improving photosynthetical capacity and decreasing leaf temperature of Cnidium officinale.

• Young Jin Seo(Bonghwa Herbal Crop Research Institute, Gyeongsangbuk-do Agricultural Research and Extention Services) | 서영진 Corresponding author
• Hyo Hoon Nam(Bonghwa Herbal Crop Research Institute, Gyeongsangbuk-do Agricultural Research and Extention Services) | 남효훈
• Beung Sung Kim(Bonghwa Herbal Crop Research Institute, Gyeongsangbuk-do Agricultural Research and Extention Services) | 김병성
• Yae Young Oh(Bonghwa Herbal Crop Research Institute, Gyeongsangbuk-do Agricultural Research and Extention Services) | 오태영
• Jong Soo Kim(Bonghwa Herbal Crop Research Institute, Gyeongsangbuk-do Agricultural Research and Extention Services) | 김종수