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Table 3 The contents of chemical substances and polyphenols in tobacco leaves inside and outside the greenhouse at different curing stages

From: Cold stress in the harvest period: effects on tobacco leaf quality and curing characteristics

Treatment

Sampling temperature (°C)

Continuous flue-curing time (h)

Conventional chemical compositions (%)

Polyphenols (mg g− 1)

 

Total sugar

Reducing sugar

Total nitrogen

Nicotine

Potassium oxide

Water soluble chloride

Starch

Protein

Sugar–nicotine ratio

Nitrogen–nicotine ratio

Neochlorogenic acid

Chlorogenic acid

Caffeic acid

Scopoletin

Rutin

Kaempferol

Inside the greenhouse

Fresh tobacco leaves

9.36Ac

5.20Ab

1.81Ac

2.33Aa

1.93Ab

0.12Ab

33.00Aa

8.46Aa

4.35Aa

0.82Aab

1.56Ac

7.25Bc

0.12Aab

0.12Aab

9.69Ab

0.11Ab

38

23.5

30.07Aa

16.00Ba

2.26Aab

3.44Aa

2.75Aab

0.24Aa

4.20Bb

7.10Ab

9.23Ba

0.67Aab

3.31Aab

16.04Ba

0.19Aa

0.09Ab

12.38Aab

0.32Aa

42

16.5

18.79Bbc

11.53Bab

2.63Aa

3.18Aa

3.57Aa

0.14Aab

1.40Ab

7.84Aab

6.04Ba

0.83Aab

2.71Ab

7.44Ac

0.05Ab

0.20Aa

8.42Ab

0.31Aa

48

15

21.65Bab

11.98Bab

2.39Aab

2.80Aa

2.98Aa

0.18Aab

2.44Ab

7.70Aab

7.84Ba

0.85Aab

3.60Aab

12.35Aabc

0.23Aa

0.10Ab

11.52Aab

0.15Ab

54

22.5

20.48Bab

10.18Bab

2.19Abc

3.35Aa

3.44Aa

0.14Aab

1.03Ab

7.26Aab

6.58Ba

0.66Ab

4.01Aa

14.62Aab

0.21Aa

0.16Aab

14.06Aa

0.16Ab

Initially flue-cured tobacco leaves

21.32Aab

12.64Bab

2.32Aab

2.75Aa

3.12Aa

0.19Aab

1.27Ab

7.45Aab

7.63Aa

0.87Aa

3.43Aab

10.42Abc

0.23Aa

0.10Ab

9.59Bb

0.15Ab

Outside the greenhouse

Fresh tobacco leaves

7.60Ab

3.79Ab

1.53Ab

2.12Aa

1.43Aa

0.06Aa

39.94Aa

6.87Ba

3.61Ab

0.73Aa

1.30Ab

14.15Abc

0.21Aab

0.13Aab

11.1Aa

0.10Ab

38

23.5

36.95Aa

25.06Aa

1.44Bb

1.89Ba

2.12Aa

0.14Aa

13.25Ab

5.41Bb

20.74Aa

0.78Aa

2.18Bab

23.20Aa

0.25Aa

0.06Ab

14.18Aa

0.19Ba

42

16.5

36.07Aa

27.56Aa

1.71Bab

2.24Aa

1.70Ba

0.06Aa

8.72Abc

6.08Bab

16.74Aa

0.78Aa

1.29Bb

9.75Ac

0.10Ab

0.18Aa

10.62Aa

0.20Ba

48

15

33.2Aa

23.02Aa

1.99Ba

2.86Aa

1.76Ba

0.07Ba

7.41Abc

6.56Aab

14.07Aa

0.79Aa

3.07Aa

16.73Ab

0.25Aa

0.12Aab

13.28Aa

0.08Ab

54

22.5

36.31Aa

23.23Aa

1.64Bab

2.12Ba

1.73Ba

0.09Aa

5.40Ac

5.67Bab

17.55Aa

0.78Aa

2.82Ba

18.60Aab

0.19Aab

0.06Bb

12.92Aa

0.10Ab

Initially flue-cured tobacco leaves

30.88Aa

24.42Aa

2.00Aa

2.58Aa

2.07Ba

0.06Ba

8.48Abc

6.82Aa

12.11Aab

0.79Aa

2.62Aa

15.69Ab

0.29Aa

0.11Aab

14.37Aa

0.08Ab

  1. Different capital letters indicate that there were significant differences among different treatments at the same sampling temperature point. Different lowercase letters indicate that there were significant differences among different sampling temperature at the same treatments (P < 0.05). The values were the mean of three biological replicates