关键词: 烤烟, 许金101, 失水, 变黄, 多酚氧化酶, 烟叶质量, 烘烤特性

Abstract: In order to clarify the curing characteristics and the quality of tobacco leaves of a new self‑bred flue‑cured tobacco variety Xujin 101，with the main variety Zhongyan 100 as a control，the yellowing，water loss，chlorophyll degradation and polyphenol oxidase activity of Xujin 101 tobacco leaves during the dark‑box and curing process were studied，and the differences in appearance quality，sensory evaluation quality，neutral aroma‑causing substances and main chemical components of cured tobacco leaves were analyzed.The results showed that under dark‑box conditions，Xujin 101 took 72 h and 48 h to turn completely yellow in the middle and upper leaves，respectively，and the time for 30% browning was 120 h and 72 h，respectively. The yellowing index and browning index were both higher than those of Zhongyan 100.On the whole it was easy to turn yellow and brown. The water loss balance was 1.16 and 0.47，respectively，and the water loss balance was good. The degradation rate of chlorophyll reached 1.32%/h and 1.37%/h respectively at 72 h，the degradation amount reached 94.88% and 98.71%，and the degradation characteristics were good.The average PPO activities after baking 24—96 h were 0.409 U and 0.420 U，respectively，the middle leaves had poor baking resistance，and the upper leaves had moderate baking resistance. Although the baking characteristics of Xujin 101 were slightly better than Zhongyan 100，but the initial curing plan had a greater impact on the quality of Xujin 101 tobacco leaves after curing，and the overall quality was slightly worse than that of Zhongyan 100.According to comprehensive analysis，Xujin 101 is easy to bake，but has average baking resistance.In order to highlight the characteristics of Xujin 101，it is necessary to set up a baking process according to its baking characteristic. In the early stage of yellowing，the temperature difference between dry and wet bulbs should be appropriately reduced to reduce the moisture loss of tobacco leaves.In the later stage，the temperature difference between dry and wet bulbs should be appropriately increased to improve the dehumidification strength，promote drying and prevent browning，and ensure safe color setting of tobacco leaves to improve its use value and economic value.

Key words: Flue?cured tobacco, Xujin 101, Water loss, Yellowing, Polyphenol oxidase, Tobacco leaf quality, Curing characteristics