Table 2 The changes of pigments content and polyphenols content in tobacco leaves under different curing time.

Upper leaves

0

225.09 ± 4.52^a

109.51 ± 7.19^a

1.50 ± 0.15^d

1.66 ± 0.14^e

12.06 ± 0.51^d

0.20 ± 0.01^c

17.84 ± 0.44^c

2.07 ± 0.52^a

35.34 ± 0.98^d

24

149.18 ± 7.59^b

75.26 ± 8.04^b

1.67 ± 0.17^cd

1.89 ± 0.19^de

15.00 ± 1.12^abc

0.24 ± 0.02^b

18.19 ± 1.49^c

2.46 ± 0.44^a

39.45 ± 2.78^bcd

48

114.77 ± 9.35^c

55.44 ± 7.09^c

1.85 ± 0.19^abcd

2.01 ± 0.17^cde

14.14 ± 2.04^bcd

0.21 ± 0.04^bc

18.95 ± 3.68^bc

2.19 ± 0.29^a

39.35 ± 5.72^bcd

60

117.75 ± 8.91^c

55.30 ± 6.56^c

1.97 ± 0.42^abc

2.20 ± 0.39^abcd

13.98 ± 1.67^bcd

0.19 ± 0.01^c

19.00 ± 1.11b^c

2.15 ± 0.20^a

39.38 ± 3.23^bcd

72

106.61 ± 8.25^cd

50.03 ± 2.86^c

1.80 ± 0.11b^cd

1.99 ± 0.17^de

13.03 ± 1.15^cd

0.21 ± 0.02^bc

18.77 ± 1.84^bc

2.25 ± 0.30^a

37.96 ± 3.27^cd

84

105.63 ± 11.64^cd

51.79 ± 9.34^c

2.05 ± 0.08^ab

2.21 ± 0.10^abcd

14.78 ± 0.78^abc

0.22 ± 0^bc

19.45 ± 1.52^abc

2.22 ± 0.09^a

40.83 ± 1.94^bc

96

89.02 ± 9.35^de

44.92 ± 5.32^c

1.94 ± 0.07^abc

2.11 ± 0.06^bcd

14.78 ± 1.16^abc

0.26 ± 0^a

20.90 ± 0.92^abc

2.36 ± 0.26^a

42.25 ± 2.35^abc

108

88.36 ± 7.04^de

44.50 ± 4.73^c

2.19 ± 0.08^a

2.42 ± 0.07^ab

15.93 ± 0.61^ab

0.28 ± 0.01^a

21.67 ± 2.07^ab

2.24 ± 0.10^a

44.54 ± 2.59^ab

120

77.38 ± 8.63^e

41.01 ± 5.09^c

2.19 ± 0.28^a

2.36 ± 0.28^abc

15.21 ± 1.46^abc

0.27 ± 0.01^a

20.56 ± 0.97^abc

2.21 ± 0.14^a

42.61 ± 1.45^abc

132

78.52 ± 8.08^e

42.68 ± 3.82^c

2.18 ± 0.11^ab

2.48 ± 0.07^a

16.77 ± 0.17^a

0.27 ± 0^a

22.38 ± 0.46^a

2.35 ± 0.18^a

46.24 ± 0.09^a

Middle leaves

0

231.98 ± 15.99^b

112.47 ± 7.59^a

1.42 ± 0.20^d

1.97 ± 0.35^d

10.77 ± 0.96^c

0.19 ± 0.02^c

16.15 ± 0.49^e

1.38 ± 0.08^e

31.89 ± 2.07^d

24

167.43 ± 15.62^a

64.36 ± 7.81^b

1.82 ± 0.05^cd

2.43 ± 0.13^cd

16.16 ± 0.60^b

0.27 ± 0.02^ab

18.17 ± 0.59^de

1.52 ± 0.06^de

40.38 ± 0.75^c

48

110.49 ± 14.43^c

41.28 ± 9.82^c

1.79 ± 0.19^cd

2.47 ± 0.28^cd

16.36 ± 0.23^b

0.30 ± 0.02^a

18.86 ± 1.14^cd

1.60 ± 0.13^de

41.37 ± 0.59^c

60

114.64 ± 11.08^c

45.77 ± 6.95^bc

2.17 ± 0.20^bc

2.64 ± 0.21^bc

16.2 ± 1.05^b

0.24 ± 0^b

18.37 ± 1.47^de

1.67 ± 0.21^cd

41.28 ± 2.40^c

72

114.42 ± 11.76^cd

48.22 ± 5.98^bc

2.16 ± 0.39^bc

2.78 ± 0.38^bc

17.24 ± 0.59^b

0.26 ± 0.03^ab

20.07 ± 1.34^bcd

1.86 ± 0.08^bc

44.36 ± 1.80^c

84

92.35 ± 12.53^cd

38.87 ± 7.49^c

2.56 ± 0.11^ab

3.16 ± 0.14^ab

19.99 ± 1.10^a

0.30 ± 0.01^a

21.15 ± 0.89^abc

1.97 ± 0.03^ab

49.13 ± 1.25^b

96

97.15 ± 10.83^cd

39.98 ± 5.57^c

2.73 ± 0.12^a

3.15 ± 0.18^ab

19.77 ± 0.69^a

0.28 ± 0.02^ab

22.45 ± 2.74^ab

2.09 ± 0.19^ab

50.47 ± 3.59^ab

108

93.17 ± 11.61^cd

41.81 ± 3.43^c

2.52 ± 0.22^ab

2.99 ± 0.21^abc

20.69 ± 0.51^a

0.27 ± 0.03^ab

22.62 ± 2.04^ab

2.16 ± 0.23^a

51.26 ± 2.30^ab

120

93.41 ± 10.15^cd

45.64 ± 4.39^bc

2.92 ± 0.19^a

3.53 ± 0.34^a

22.03 ± 1.78^a

0.30 ± 0.04^a

23.18 ± 1.50^a

2.22 ± 0.16^a

54.19 ± 3.23^a

132

85.77 ± 13.11^d

45.18 ± 3.41^bc

2.90 ± 0.47^a

3.48 ± 0.69^a

21.35 ± 2.57^a

0.29 ± 0.01^a

21.77 ± 0.82^ab

1.97 ± 0.07^ab

51.77 ± 4.27^ab