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对不同衰老程度叶片的研究结果表明，香料烟叶片的叶绿素、类胡萝卜素含量、光合速率及过氧化氢酶（ＣＡＴ）活性随衰老程度加深而降低，过氧化物酶（ＰＯＤ）活性及丙二醛（ＭＤＡ）含量随叶片衰老而提高。对不同部位（上部、中部和下部）和不同成熟度（欠熟、适熟和过熟）叶片的研究结果表明，同一部位的叶片随着成熟度的提高，其ＣＡＴ活性、叶绿素含量及光合速率明显降低，ＰＯＤ活性明显提高。同一成熟度的叶片，其ＣＡＴ和ＰＯＤ活性在下、中、上三个部位间呈“Ｖ”型变化。同一成熟度叶片的还原糖含量随叶片着生部位升高而增加，而蛋白质含量在下、中、上三个部位间表现为“Ｖ”型变化。同一部位不同成熟度叶片的还原糖含量变化趋势是适熟叶＞过熟叶＞欠熟叶；蛋白质含量变化则为过熟叶＞适熟叶＞欠熟叶。适熟期及时采收有利于获得高质量的香料烟叶。
The results showed that the content of chlorophyll, carotenoid, photosynthetic rate and catalase (CAT) in the leaves of Aromatic tobacco decreased with the aging degree. The activities of peroxidase (POD) The content of aldehyde (MDA) increased with leaf senescence. The results of the study on different parts (upper part, middle part and lower part) and different mature (under-ripened, adapted and over-ripened) leaves showed that the CAT activity, chlorophyll content and photosynthetic rate Significantly reduced, POD activity was significantly improved. The same maturity of the leaves, CAT and POD activity in the next, middle and upper three sites showed a “V” -shaped changes. The reducing sugar content of leaves with the same maturity increased with the growing parts of the leaves, while the protein content showed “V” changes among the lower, middle and upper parts. The change trend of reducing sugar content in leaves with different maturity at the same position was that of suitable leaf> overmature leaf> undermature leaf; while the change of protein content was overmature leaf> adaptive leaf> undermature leaf. Appropriate harvesting timely harvest is conducive to obtaining high-quality spice tobacco.