Phytotoxic effects of essential oil from Cymbopogon citratus and its physiological mechanisms on barnyardgrass (Echinochloa crus-galli)

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• 作者：Tanatson Poonpaiboonpipat^a ; Udomporn Pangnakorn^a ; Umporn Suvunnamek^a ; Montinee Teerarak^b ; Patchanee Charoenying^c ; Chamroon Laosinwattana^b ; ^{klchamro@kmitl.ac.th}
• 关键词：Essential oil ; Cymbopogon citratus ; Allelopathy ; Echinochloa crus-galli ; 伪-Amylase activity ; Total chlorophyll and carotenoid content ; Electrolyte leakage ; Lipid peroxidation
• 刊名：Industrial Crops and Products
• 出版年：2013
• 期刊代码：56_09266690
• 类别：abs
• 出版时间：January, 2013
• 卷：41
• 期：Complete
• 页码：403-407
• 文件大小：319 K

摘要

Lemongrass (Cymbopogon citratus) essential oil was identified by GC-MS for their major compound constituents; six compounds representing 92.59%of the total essential oil were identified. The main constituent was citral (76.00%). In a laboratory bioassay, high concentration of essential oil significantly inhibited germination and seedling growth of Echinochloa crus-galli and affecting 伪-amylase activity of seeds. In a glass house bioassay, essential oil at concentrations of 1.25, 2.5, 5 and 10%(v/v) was foliar-applied on E. crus-galli at 28 days after sowing at spray volume of 1000 L ha^鈭?. Observation of leaf wilt symptoms was noted at 6 h after treatment. Chlorophyll a, b and carotenoid content was decreased with concentrations of essential oil, indicating that essential oil interferes with photosynthetic metabolism. C. citratus essential oil caused an electrolyte leakage indicating membrane disruption and loss of integrity. Treated leaves exhibited an increase in thiobarbituric acid reactive substances (TBARS), suggesting lipid peroxidation. It is to conclude that essential oil is phytotoxic and could be utilized as a natural herbicide for future weed control.