Abstract: Burley hybrid Dabai 1 non-converters were used to investigate the changes in contents of alkaloids and neutral aroma components among different leaf positions in air-cured leaves at two leaf number treatments(18-leaves per plant and 24-leaves per plant).GC/MS and GC were used respectively to analyze the contents of neutral aroma components and alkaloids.Results showed that contents of nicotine and secondary amine alkaloids increased linearly with leaf position,and the differences between top and bottom leaves were less for 18 leaf plants than for 24-leaf plants.Contents of neutral aroma components showed different changing trends.The contents of megastigmatrieonel in all leaves were higher for 18-leaf plants than for 24-leaf plants and increased with leaf position;For 24-leaf plants,the contents of megastigmatrieonel was highest in middle stalk position.Except for β-damascone which was abundant in the middle leaf position,all other carotenoid catabolites had increasing trends with leaf position.The content of solanone,the cembratriendiol catabolite,was the highest in middle leaves,and was higher for 24-leaf plants than for 18-leaf plants.The contents of phenyl ethyl alcohol and phenyl acetaldehyde increased significantly with leaf position.

Key words: Burley tobacco, Leaf position, Leaf number, Aroma components, Alkaloids

CLC Number: 

• S572.01