Dynamic Changes of Moisture and Substance in Middle Tobacco Leaves of ‘Yunyan 87’During Curing Process of Steady Temperature and Humidity Drop

doi:10.11924/j.issn.1000-6850.casb2024-0497

Abstract

Abstract:

In order to clarify the dynamic changes of moisture and substance in tobacco leaves during the heat pump intensive curing barn using different curing processes, the middle leaves of ‘Yunyan 87’ were used as experimental materials to study the dynamic changes and similarities of moisture, pigments, starch, and reducing sugar content during the steady temperature and humidity drop curing process and the four step curing processes in the heat pump intensive curing. The results showed that: (1) the moisture content of tobacco leaves in the early period of yellowing of the steady temperature and humidity drop curing process was higher than that of four step curing process. (2) The chlorophyll a and chlorophyll b of tobacco leaves in the early period of yellowing were higher than the four-step curing process, but lower than the four step curing process in the middle and late period of curing. (3) The contents of carotenoid and starch in tobacco leaves of the steady temperature and humidity drop curing process were lower than those of four step curing process, but the content of reducing sugar was higher than that of four step curing process. (4) The similarity of different substances in the two curing processes was ranked as follows: moisture> chlorophyll a> starch> chlorophyll b> reducing sugar> carotenoid. The dynamic changes of substances in the curing process can be divided into three categories. The first type includes moisture, chlorophyll a, chlorophyll b and starch, and the differences between the two curing processes mainly occur in the yellowing period. The second type is reducing sugar, and the difference between the two curing processes mainly occurs in the color-fixing period and the stem-drying period. The third type is carotenoid, two kinds of curing process have great differences during the whole curing process.

Key words: middle tobacco leaves, steady temperature and humidity drop curing process, four step curing process, chemical composition, dynamic change, similarity analysis

LI Bo, JIANG Zhimin, CHENG Changhe, PENG Dong, XU Jiadan, WANG Qing, CHEN Xinjie, SHOU Zhiguo, ZONG Yi, ZHOU Haikuan, DENG Xiaohua. Dynamic Changes of Moisture and Substance in Middle Tobacco Leaves of ‘Yunyan 87’During Curing Process of Steady Temperature and Humidity Drop[J]. Chinese Agricultural Science Bulletin, 2025, 41(10): 146-151.

Figures/Tables 9

References 27

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取样次数	水分	叶绿素a	叶绿素b	类胡萝卜素	淀粉	还原糖
1	0.01	0.07	0.15	0.04	0.02	0.05
2	0.24	0.21	0.40	0.24	0.20	0.07
3	0.25	0.28	0.41	0.09	0.23	0.11
4	0.21	0.32	0.19	0.42	0.18	0.04
5	0.17	0.13	0.10	0.28	0.12	0.01
6	0.25	0.07	0.09	0.41	0.19	0.01
7	0.16	0.03	0.01	0.35	0.10	0.03
8	0.09	0.06	0.05	0.20	0.09	0.03
9	0.03	0.02	0.00	0.13	0.03	0.02
平均值	0.16	0.13	0.16	0.24	0.13	0.04

取样次数	水分	叶绿素a	叶绿素b	类胡萝卜素	淀粉	还原糖
1	0.01	0.07	0.15	0.04	0.02	0.05
2	0.24	0.21	0.40	0.24	0.20	0.07
3	0.25	0.28	0.41	0.09	0.23	0.11
4	0.21	0.32	0.19	0.42	0.18	0.04
5	0.17	0.13	0.10	0.28	0.12	0.01
6	0.25	0.07	0.09	0.41	0.19	0.01
7	0.16	0.03	0.01	0.35	0.10	0.03
8	0.09	0.06	0.05	0.20	0.09	0.03
9	0.03	0.02	0.00	0.13	0.03	0.02
平均值	0.16	0.13	0.16	0.24	0.13	0.04