TABLE 4.

Contents of polyphenols during bulk curing of flue-cured tobacco with different salicylic acid concentrations.

Treatment	Sampling temperature (°C)	Curing time (h)	Neochlorogenic acid (mg/g)	Chlorogenic acid (mg/g)	Caffeic acid (mg/g)	Scopoletin (mg/g)	Rutin (mg/g)	Kaempferol-3-O-rutinoside (mg/g)
Control	Fresh tobacco	–	0.82Ad	8.78Ab	0.13ABc	0.23Aa	7.39Ab	0.08Bb
	38	23.5	1.85Ac	16.59Ba	0.17Abc	0.08Ab	11.35Ba	0.17Aa
	42	16.5	2.08Bbc	13.68Aab	0.18Abc	0.07Ab	12.16Ba	0.08ABb
	48	15	2.95Aa	18.43Aa	0.28Aa	0.11Ab	12.88Aa	0.09Ab
	54	22.5	2.54Aabc	17.61Aa	0.28Aa	0.06ABb	12.71Aa	0.08Ab
	Primary tobacco leaf	–	2.69Aab	18.22Aa	0.25Aab	0.1Ab	12.25Aa	0.06Ab
SA-1	Fresh tobacco	–	1.02Ab	10.05Ac	0.18Ac	0.15Ba	7.64Ac	0.13Ab
	38	23.5	2.46Aa	18.46ABab	0.17Ac	0.09Aab	13.17ABab	0.19Aa
	42	16.5	2.99Aa	10.91Ac	0.17Ac	0.09Aab	10.32Bbc	0.12Abc
	48	15	2.88Aa	21.72Aa	0.28Aa	0.12Aab	14.16Aa	0.08Ac
	54	22.5	3.01Aa	13.7Abc	0.19Bbc	0.12Aab	10.12Abc	0.1Abc
	Primary tobacco leaf	–	2.83Aa	17.25Aab	0.27Aab	0.06Ab	11.97Aab	0.08Ac
SA-2	Fresh tobacco	–	0.68Ac	5.53Ac	0.08Bb	0.18ABa	6.82Ab	0.09ABb
	38	23.5	2.28Ab	22.06Aa	0.22Aa	0.12Aabc	15.42Aa	0.19Aa
	42	16.5	2.95Aab	15.74Ab	0.2Aa	0.14Aab	16.34Aa	0.07Bb
	48	15	2.93Aab	19.38Aab	0.23Aa	0.09Abc	15.29Aa	0.08Ab
	54	22.5	3Aab	17.24Aab	0.27ABa	0.04Bc	13.3Aa	0.06Ab
	Primary tobacco leaf	–	3.11Aa	17.97Aab	0.22Aa	0.1Abc	13.68Aa	0.08Ab

Different capital letters indicate significant between different treatments at the same stage (P < 0.05). Different lowercase letters indicate significant between the same treatments at different curing stages. Values represent the averages of three biological replicates.