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《Chinese Journal of Biological Control》 2018-03
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Anti-oomycete Activity of Cinnamon Essential Oil against Phytophthora capsici

WANG Haijiao;WANG Yinan;GAO Fei;DUAN Pengfei;LIU Xiangyang;YOU Xiufeng;YAO Lunguang;ZHAO Te;ZHOU Lin;College of Plant Protection, Henan Agricultural University/Creation and Application of Novel Pesticides of Henan Province;Collaborative Innovation Center of Water Security for Water Source, Region of Mid-line of South-to-North Diversion Project,Henan Province/Key Laboratory of Ecological Security for Water Source Region of Mid-line of South-to-North Diversion Project of Henan Province;  
The aim of this study was to evaluate the effectiveness of cinnamon essential oil on controlling pepper blight caused by Phytophthora capsici. The toxicities of the essential oil against P. capsici at their four different life stages were examined in vitro conditions and the control efficacies were also investigated in vivo conditions. Moreover, morphology and structure of mycelial treated with the essential oil were observed and the effect of the essential oil on the permeability of the cell membrane was determined. The results showed that the EC_(50) value of cinnamon essential oil against the mycelial growth was 111.89 mg/L. The oil could effectively inhibit sporangium formation, sporangium germination and zoospore germination with EC_(50) values of 61.09 mg/L, 95.14 mg/L and 54.88 mg/L, respectively. The zoospore of the tested pathogen strain was sensitive to the cinnamon essential oil. The mycelial fresh weight and dry weight were significantly decreased by the essential oil. Morphological and structural observation showed that cinnamon essential oil caused the excessive branching and shortening of hyphae. The conductivity of mycelia cell suspension increased in the presence of the essential oil, indicating that the oil affected the cell membrane permeability. The conductivities of mycelia treated by essential oil at four concentrations increased with time, significantly higher than that of control. The above results showed that cinnamon essential oil had good protective and therapeutic effects on pepper blight, and the protective effect was stronger than the therapeutic effect. Therefore, cinnamon essential oil is worthy of further study and has a strong application potential.
【Fund】: 国家自然科学基金(31371962);; 河南省科技创新人才基金(134100510009)
【CateGory Index】: S436.418
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