Effect of Structural Optimization on Quality and Aroma Component Content of Tobacco Leaves with Different Leaf Positions
[Objective] To study the effects of structure optimization on the contents of total phenols,total flavonoids,carotenoids and aroma components in different parts of tobacco leaves, and to seek a tobacco planting optimization technology that can effectively improve tobacco quality,so as to provide certain theoretical and technical basis for improving tobacco aroma quality and cigarette quality.[Method] Tobacco leaf was used as material in the planting base for structural optimization treatment ( the bottom 3 pieces and the top 3 pieces of tobacco were re-moved),and the effects of structural optimization treatment on the contents of total phenols,total flavonoids,carotenoids and aroma components in different parts of tobacco leaf were analyzed and evaluated.[Result]Structural optimization treatment increased the total phenolic and fla-vonoid contents in tobacco leaves.After structural optimization treatment,the total phenolic content in tobacco leaves at 6,8,12 and 14 positions was increased by 30.00％,21.70％,13.10％ and 5.00％,respectively,compared with the control,and the total flavonoid content in tobacco leav-es at 4,10 and 12 positions was also significantly higher than that of the control. A total of 22 main volatile substances were detected by SPME-GC-MS,and the structure optimization treatment effectively increased the carotenoid content in tobacco leaves.The contents of aroma substances synthesized from carotenoids as precursors were all affected by the structure optimization treatment.And the influence degree of dif-ferent leaf position is different.[Conclusion]Structure optimization treatment can effectively increase the contents of total phenol,total flavone and carotenoid in cured tobacco leaves of different leaf positions,improve the quality of tobacco leaves,and significantly increase the content of aroma components,which provides a certain theoretical and technical basis for improving the aroma quality of tobacco and cigarette quality.
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