Crops ›› 2022, Vol. 38 ›› Issue (5): 174-179.doi: 10.16035/j.issn.1001-7283.2022.05.025

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Characteristics of Water Loss and Pigment Degradation of Xiangyan No.7 Tobacco Leaves during Curing Process

Zhu Lin1(), Cao Xiang1, Deng Xiaohua1,2(), Hu Risheng2, Pei Xiaodong3, Xiang Shipeng3, Xiao Zhijun4, Wang Weimin4, Zhang Cheng4, Jiang Zhimin4   

  1. 1College of Agronomy, Hunan Agricultural University, Changsha 410128, Hunan, China
    2China Tobacco Mid-South Agricultural Experimental Station, Changsha 410004, Hunan, China
    3Hunan Tobacco Company Changsha Branch, Changsha 410011, Hunan, China
    4China Tobacco Zhejiang Industrial Co., Ltd., Hangzhou 310008, Zhejiang, China
  • Received:2021-06-28 Revised:2022-04-27 Online:2022-10-15 Published:2022-10-19

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Abstract:

In order to explore the characteristics of water loss and pigment degradation during curing process of flue-cured tobacco of Xiangyan No.7, using Yunyan 87 as control (CK), the water loss characteristics of leaves and veins and the degradation characteristics of chlorophyll a, chlorophyll b, total chlorophyll and carotenoids were studied by electric-heated flue-curing barn. The results showed the water loss peak of Xiangyan No.7 was earlier than CK. The easy curing potential of middle and lower leaves were better than CK, while the upper leaf showed the opposite trend. In the early yellowing (24h), the degradation rate of chlorophyll a was significantly lower than that of CK, while the chlorophyll b showed a opposite trend. No significant difference in chlorophyll degradation existed between Xiangyan No.7 and CK. The carotenoid degradation rate and quantity of Xiangyan No.7 were significantly lower than CK. The characteristics of water loss and pigment degradation of leaves of Xiangyan No.7 during curing were unique. In order to develop the full quality potential of Xiangyan No.7, the curing technique should be formulated according to the curing characteristics of the variety.

Key words: Flue-cured tobacco, Water loss characteristics, Pigment degradation characteristics, Xiangyan No.7, Curing characteristics

Table 1

The water loss characteristics of leaves during curing process"

部位
Position		 品种
Cultivar		 水分含量Water content (g/kg) 失水速率Water loss rate [g/(kg·h)]
0h 24h 48h 72h 96h 120h 144h 0~48h 48~96h 96~144h
上部
Upper		 湘烟7号 970.0a 724.7a 506.7a 146.0b 38.8b 31.7b 21.2a 9.65a 9.75a 0.37b
云烟87 747.7b 735.1a 561.6a 310.3a 88.9a 54.1a 15.3a 3.88b 9.85a 1.53a
中部
Middle		 湘烟7号 834.5a 783.9a 202.2b 59.9b 35.2b 23.5b 18.3a 13.17a 3.48b 0.35b
云烟87 841.5a 752.4a 422.7a 153.1a 113.8a 36.0a 22.4a 8.73b 6.44a 1.90a
下部
Lower		 湘烟7号 811.3a 754.0a 206.2a 22.1b 14.6b 9.5b 6.3b 12.61a 3.99a 0.17b
云烟87 838.9a 818.8a 201.3a 87.0a 72.1a 38.0a 24.7a 13.28a 2.69b 0.99a

Table 2

The water loss characteristics of vein during curing process"

部位
Position		 品种
Cultivar		 水分含量Water content (g/kg) 失水速率Water loss rate [g/(kg·h)]
0h 24h 48h 72h 96h 120h 144h 0~48h 48~96h 96~144h
上部
Upper		 湘烟7号 889.6a 847.1a 807.2a 735.4a 725.5a 220.5b 30.3a 1.72a 1.70b 14.48a
云烟87 886.4a 859.9a 806.1a 670.1b 584.5b 389.5a 30.0a 1.67a 4.62a 11.55b
中部
Middle		 湘烟7号 897.7a 894.30a 769.7a 721.0a 539.7a 24.7a 11.9a 2.67a 4.79a 11.00a
云烟87 903.8a 858.5a 805.0a 701.5a 578.1a 20.1a 12.6a 2.06b 4.73a 11.78a
下部
Lower		 湘烟7号 925.9a 866.0a 835.5a 728.2a 422.9a 38.6a 19.2a 1.88a 8.60b 8.41a
云烟87 911.0a 885.3a 838.4a 716.8a 173.0b 30.6b 17.8a 1.51b 13.86a 3.23b

Table 3

The water loss characteristics of tobacco leaves during curing process"

部位
Position		 品种
Cultivar		 水分含量
Water content (g/kg)		 失水速率
Water loss rate [g/(kg·h)]		 失水均衡性
Balance of water loss
0h 24h 48h 72h 96h 120h 144h 0~48h 48~96h 96~144h ≤72h
上部
Upper		 湘烟7号 935.8a 725.6b 643.6b 462.0a 399.7b 93.8b 24.6a 6.09a 5.08a 7.81b 0.80a
云烟87 811.3b 795.3a 686.4a 433.2b 426.8a 216.3a 20.0b 2.60b 5.41a 8.48a 0.25b
中部
Middle		 湘烟7号 866.8a 853.2a 603.1b 529.9a 307.6b 24.2b 15.8b 5.49a 6.16a 6.08b 1.80a
云烟87 870.7a 805.3b 705.9a 456.0b 383.9a 100.0a 23.9a 3.43b 6.71a 7.50a 0.33b
下部
Lower		 湘烟7号 906.2a 828.9a 715.9a 543.4a 273.7a 24.0b 12.7b 3.96a 9.21b 5.44a 0.55a
云烟87 876.8a 857.8a 734.3a 527.0a 120.3b 34.6a 27.3a 2.97b 12.79a 1.94b 0.34b

Table 4

The chlorophyll a degradation characteristics of tobacco leaves during curing process"

部位
Position		 品种
Cultivar		 叶绿素a含量
Chlorophyll a content (g/100kg)		 降解比例
Degradation proportion (%)		 降解速率
Degradation rate (%/h)
0h 24h 48h 72h 96h 120h 144h 24h 48h 72h 24h 48h 72h
上部
Upper		 湘烟7号 231.9a 92.5a 64.2a 34.8a 30.4a 26.9a 22.4a 60.11b 72.32a 85.01a 2.51b 1.51a 1.18a
云烟87 217.8a 74.0b 56.4b 28.1b 25.4b 23.2b 18.3b 66.03a 74.09a 87.08a 2.75a 1.54a 1.21a
中部
Middle		 湘烟7号 414.3a 157.1a 106.5a 53.9a 46.1a 39.9a 31.9a 62.09b 74.30a 86.99a 2.59b 1.55a 1.21a
云烟87 349.5b 112.2b 84.0b 38.6b 34.2b 30.7b 22.9b 67.89a 75.95a 88.95a 2.83a 1.58a 1.24a
下部
Lower		 湘烟7号 68.3b 25.1a 16.7a 8.0a 6.8a 5.7a 4.4a 63.32b 75.53a 88.22a 2.64b 1.57a 1.23a
云烟87 85.8a 26.4a 19.5a 8.3a 7.2a 6.4a 4.5a 69.22a 77.28a 90.27a 2.88a 1.61a 1.25a

Table 5

The chlorophyll b degradation characteristics of tobacco leaves during curing process"

部位
Position		 品种
Cultivar		 叶绿素b含量
Chlorophyll b content (g/100kg)		 降解比例
Degradation proportion (%)		 降解速率
Degradation rate (%/h)
0h 24h 48h 72h 96h 120h 144h 24h 48h 72h 24h 48h 72h
上部
Upper		 湘烟7号 174.3a 85.3a 53.6a 22.0a 19.1a 15.1a 12.2a 51.03a 69.23a 87.36a 2.13a 1.44a 1.21a
云烟87 165.3a 85.4a 47.3b 21.4a 19.8a 16.5a 9.9b 48.33b 71.36a 87.03a 2.01b 1.49a 1.21a
中部
Middle		 湘烟7号 43.3a 20.3a 12.5a 4.6a 3.9a 2.9a 2.2a 53.02a 71.22a 89.35a 2.21a 1.48a 1.24a
云烟87 36.3b 18.1a 9.7b 4.0a 3.7a 3.0a 1.5b 50.19b 73.23a 88.90a 2.09b 1.53a 1.24a
下部
Lower		 湘烟7号 103.5a 47.4a 28.5a 9.8a 8.0a 5.7a 3.9a 54.25a 72.45a 90.58a 2.26a 1.51a 1.26a
云烟87 23.9b 11.6b 6.1b 2.3b 2.1b 1.6b 0.7b 51.51b 74.55a 90.22a 2.15b 1.55a 1.25a

Table 6

The total chlorophyll degradation characteristics of tobacco leaves during curing process"

部位
Position		 品种
Cultivar		 叶绿素总量
Chlorophyll content (g/100kg)		 降解比例
Degradation proportion (%)		 降解速率
Degradation rate (%/h)
0h 24h 48h 72h 96h 120h 144h 24h 48h 72h 24h 48h 72h
上部
Upper		 湘烟7号 284.7a 115.7a 48.0a 19.0a 6.2b 5.6a 4.2a 59.36a 83.15a 93.31a 2.47a 1.73a 1.30a
云烟87 252.1b 109.7b 51.4a 20.2a 9.5a 5.5a 3.8a 56.51b 79.60a 91.98a 2.36b 1.66a 1.28a
中部
Middle		 湘烟7号 488.4a 307.8a 35.8a 22.7a 14.4a 9.2a 1.2b 36.97b 92.67a 95.35a 1.54b 1.93a 1.32a
云烟87 435.1b 248.4b 35.1a 14.7b 10.2b 8.6a 8.2a 42.92a 91.94a 96.63a 1.79a 1.92a 1.34a
下部
Lower		 湘烟7号 187.3a 50.4b 18.5b 15.2a 11.0a 7.3a 0.5a 73.07a 90.11a 91.86a 3.04a 1.88a 1.28a
云烟87 164.4b 63.5a 31.4a 12.7a 10.1a 3.8b 0.8a 61.41b 80.90b 92.26a 2.56b 1.69b 1.28a

Table 7

The carotenoid degradation characteristics of tobacco leaves during curing process"

部位
Position		 品种
Cultivar		 类胡萝卜素含量
Carotenoid content (g/100kg)		 降解比例
Degradation proportion (%)		 降解速率
Degradation rate (%/h)
0h 24h 48h 72h 96h 120h 144h 24h 48h 72h 24h 48h 72h
上部
Upper		 湘烟7号 87.4b 67.6a 58.8a 50.5a 46.0b 43.6a 36.2a 22.65b 32.65b 42.15b 0.94b 0.68b 0.59b
云烟87 102.6a 65.4a 54.3b 47.6b 49.2a 42.9a 33.8b 36.22a 47.03a 53.62a 1.51a 0.98a 0.75a
中部
Middle		 湘烟7号 79.5a 59.9a 51.9a 44.4a 40.2a 38.1a 31.3a 24.64b 34.64b 44.14b 1.03b 0.72b 0.61b
云烟87 56.1b 34.7b 28.7b 25.0b 25.8b 22.4b 17.4b 38.08a 48.90a 55.49a 1.59a 1.02a 0.77a
下部
Lower		 湘烟7号 20.1a 14.9a 12.9a 11.0a 9.9a 9.4a 7.7a 25.87b 35.87b 45.37b 1.08b 0.75b 0.63b
云烟87 18.4a 11.1b 9.1b 7.9b 7.7b 7.1b 5.5b 39.40a 50.22a 56.81a 1.64a 1.05a 0.79a
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