UV-B辐射对薄荷药用成分质量分数的影响  

Effects of Enhanced UV-B Radiation on Amino Acid and Secondary Metabolite Contents in Mentha piperita L.

作　　者：吴能表[1,2] 罗红丽[3] 马红群[1,2] 吴督督 张扬欢[1,2] 胡丽涛[1,2] 孙金春[1,2] 

机构地区：[1]西南大学生命科学学院,重庆400715 [2]三峡库区生态环境教育部重点实验室,重庆400715 [3]西南大学药学院,重庆400715 [4]宜宾五粮液集团精细化工有限公司,四川宜宾644000

出　　处：《西南大学学报（自然科学版）》2012年第6期1-5,共5页Journal of Southwest University(Natural Science Edition)

基　　金：国家自然科学基金资助项目(30500041);中央高校基本科研业务费专项资金资助项目(XDJK2009C195);三峡库区生态环境教育部重点实验室自由探索基金资助项目(EF200516)

摘　　要：目的:探讨增强UV-B辐射对胡椒薄荷氨基酸及药用次生代谢物质量分数的影响.方法:人工模拟生长环境中紫外辐射增强处理胡椒薄荷,用分光光度法测胡椒薄荷内黄酮质量分数,氨基酸采用日立L-8800型全自动氨基酸分析仪测定,薄荷挥发油中主要药用成分质量分数测定采用Agilent 6820气相色谱仪(配氢火焰检测器FID,美国安捷伦公司)测定.结果:0.15W/m2紫外胁迫下胡椒薄荷体内黄酮质量分数显著升高,Glu,Lys,Gly,薄荷醇、薄荷酮、胡薄荷酮质量分数均显著降低,Leu,Phe质量分数变化呈先降低后升高的趋势,蛋白质质量分数在UV-B胁迫后20d和30d显著降低;0.35W/m2紫外胁迫下黄酮质量分数先升高后降低,在30d时达到峰值,Glu,Gly,Leu,Tyr,Phe,Arg质量分数及9种药用氨基酸之和均在前40d明显下降,蛋白质质量分数在处理的后20d显著降低,而薄荷醇、薄荷酮、胡薄荷酮质量分数显著上升.结论:低强度UV-B辐射促进了芳香族氨基酸Phe和支链氨基酸Leu的合成,而高强度UV-B胁迫降低了胡椒薄荷中药用氨基酸的质量分数,UV-B胁迫增强下胡椒薄荷可以通过增加黄酮、薄荷醇、薄荷酮、胡薄荷酮等药用次生代谢产物来提高对UV-B辐射的适应性.To study the effects of UV-B radiation on amino acid and secondary metabolite contents in Mentha piperita L. , M. piperita plants were exposed to enhanced UV-B radiation at 0.15 and 0.35 W/m2 , and flavone, medicinal amino acids, and menthol, menthone, and P-menthone in the volatile oils were determined. Under 0. 15 W/m2 radiation stress, the content of flavone in the plants was significantly increased; the contents of Glu, Lys, Gly and menthol, menthone and P-menthone in the volatile oils were significantly decreased, while Leu and Phe first increased and then decreased, and the content of soluble proteins decreased significantly 20 and 30 days after the treatment. Under 0.15 W/m2 radiation stress, the content of flavone first increased and decreased later and reached the maximum after 30 days; the contents of Glu, Gly, Leu, Tyr, Phe and Arg and the sum of 9 medicinal amino acids were decreased significantly in 10--40 days, the content of soluble proteins was decreased 20 days after the treatment, and the contents of menthol, menthone, P-menthone in the volatile oils were increased significantly. It is concluded from the present work that low dosage UV-B radiation promoted the synthesis of the aromatic amino acid Phe and the branched-chain amino acid Leu while high dosage UV-B radiation decreased the contents of medicinal amino acids of M. piperita L, and that the M. piperita plants could increase the contents of the secondary metabolites such as flavone, menthol, menthone and P-menthone to enhance their adaptability to UV-B radiation.

关 键 词：胡椒薄荷 UV-B胁迫 次生代谢物 氨基酸 

分 类 号：Q945.79[生物学—植物学]