Differences in Color Value and SPAD of Tobacco Leaves with Different Ripeness and Their Effects on Quality of Cured Tobacco Leaves

doi:10.11923/j.issn.2095-4050.cjas2024-0110

Abstract

Abstract:

In order to explore the differences in color value, SPAD value and quality of cured tobacco leaves with different maturity levels, the color parameters, SPAD values, conventional chemical composition and sensory quality in different sections of the tobacco leaves of three ripening levels were studied using the middle and upper tobacco leaves of ‘Yunyan 87’ as materials. The results showed that with the increase of the harvesting maturity of the middle and upper tobacco leaves, the L^*, a^* and b^* values of tobacco leaves gradually increased, the SPAD values gradually decreased, and the uniformity of leaf color deteriorated. The color value and SPAD value of different sections of the same tobacco leaf were different, and the color value of the section near the tip of the leaf was larger and the SPAD value was smaller. The color value of the lower section (C area) of the middle tobacco leaves and the upper section (D area) of the upper tobacco leaves was similar to the overall mean value of the leaves, and the SPAD value of the upper section (D area) of the middle and upper tobacco leaves was similar to the overall mean value of the leaves. From the perspective of the quality of cured tobacco leaves, with the improvement of maturity, the quality of tobacco leaves first increased and then decreased; the middle tobacco leaves were roasted when the yellow-green area of the leaf surface was about 60% and the main vein became white about 1/2, while the upper tobacco leaves were roasted when the yellow-green area of the leaf surface was about 80% and the main vein became white about 2/3, the comprehensive quality of the cured tobacco leaves was relatively good. In addition, the color parameters L^*, a^* and b^* of tobacco leaves were negatively correlated with SPAD values, and the color parameters and SPAD values were significantly or extremely significantly correlated with some conventional chemical composition indexes of tobacco leaves.

Key words: maturity, color values, SPAD, tobacco quality, correlation analysis

TANG Min, HUANG Jian, LU Weipeng, ZHANG Hong, WANG Zhushi, MA Zhanfeng, YANG Xikun, XIAO Fei. Differences in Color Value and SPAD of Tobacco Leaves with Different Ripeness and Their Effects on Quality of Cured Tobacco Leaves[J]. Journal of Agriculture, 2025, 15(8): 69-76.

Figures/Tables 9

References 27

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处理	部位	成熟特征
TC1	中部叶	叶面黄绿色面积5成左右，主脉变白1/3左右
TC2		叶面黄绿色面积6成左右，主脉变白1/2左右
TC3		叶面黄绿色面积7成左右，主脉变白2/3左右
TB1	上部叶	叶面黄绿色面积7成左右，主脉变白1/2左右
TB2		叶面黄绿色面积8成左右，主脉变白2/3左右
TB3		叶面黄绿色面积9成左右，主脉基本全白

处理	部位	成熟特征
TC1	中部叶	叶面黄绿色面积5成左右，主脉变白1/3左右
TC2		叶面黄绿色面积6成左右，主脉变白1/2左右
TC3		叶面黄绿色面积7成左右，主脉变白2/3左右
TB1	上部叶	叶面黄绿色面积7成左右，主脉变白1/2左右
TB2		叶面黄绿色面积8成左右，主脉变白2/3左右
TB3		叶面黄绿色面积9成左右，主脉基本全白

颜色参数	处理	A区段	B区段	C区段	D区段	E区段	F区段	叶面均值	区段间最大差值
L*	TC1	36.97c	36.26c	37.49c	37.15c	36.66c	37.50c	37.01c	1.24
	TC2	39.82b	39.43b	43.36b	46.56b	46.42b	43.07b	43.11b	7.13
	TC3	46.52a	49.40a	52.94a	54.78a	53.47a	51.87a	51.50a	8.26
a*	TC1	-12.27b	-11.83a	-11.86b	-10.89b	-10.87b	-11.67b	-11.57b	1.40
	TC2	-12.23b	-11.68a	-11.37a	-10.83b	-10.59b	-11.65b	-11.39b	1.64
	TC3	-11.78a	-11.39a	-11.33a	-10.05a	-9.63a	-10.08a	-10.71a	2.15
b*	TC1	22.58c	23.07c	23.15c	23.77c	23.18c	23.67c	23.24c	1.19
	TC2	27.87b	28.23b	31.23b	34.80b	34.73b	33.17b	31.65b	6.93
	TC3	36.55a	39.30a	42.45a	44.25a	44.50a	42.65a	41.62a	7.95

颜色参数	处理	A区段	B区段	C区段	D区段	E区段	F区段	叶面均值	区段间最大差值
L*	TC1	36.97c	36.26c	37.49c	37.15c	36.66c	37.50c	37.01c	1.24
	TC2	39.82b	39.43b	43.36b	46.56b	46.42b	43.07b	43.11b	7.13
	TC3	46.52a	49.40a	52.94a	54.78a	53.47a	51.87a	51.50a	8.26
a*	TC1	-12.27b	-11.83a	-11.86b	-10.89b	-10.87b	-11.67b	-11.57b	1.40
	TC2	-12.23b	-11.68a	-11.37a	-10.83b	-10.59b	-11.65b	-11.39b	1.64
	TC3	-11.78a	-11.39a	-11.33a	-10.05a	-9.63a	-10.08a	-10.71a	2.15
b*	TC1	22.58c	23.07c	23.15c	23.77c	23.18c	23.67c	23.24c	1.19
	TC2	27.87b	28.23b	31.23b	34.80b	34.73b	33.17b	31.65b	6.93
	TC3	36.55a	39.30a	42.45a	44.25a	44.50a	42.65a	41.62a	7.95

颜色参数	处理	A区段	B区段	C区段	D区段	E区段	F区段	叶面均值	区段间最大差值
L*	TB1	39.72b	39.50c	39.78c	42.46c	43.70b	42.58c	41.29c	4.20
	TB2	42.78b	44.01b	45.33b	45.02b	47.39b	46.35b	45.15b	4.61
	TB3	48.67a	48.41a	51.97a	52.21a	53.74a	56.23a	51.87a	7.82
a*	TB1	-12.38b	-11.93b	-11.57c	-11.58c	-10.66c	-11.08c	-11.53c	1.72
	TB2	-11.83b	-11.48b	-10.38b	-10.05b	-10.20b	-10.42b	-10.73b	1.78
	TB3	-8.95a	-9.48a	-9.33a	-8.84a	-8.97a	-7.43a	-8.83a	2.05
b*	TB1	30.17c	29.94c	30.57c	30.98c	32.29b	32.55c	31.08c	2.61
	TB2	35.92b	35.49b	37.53b	36.68b	37.31b	38.22b	36.86b	2.73
	TB3	43.87a	42.38a	46.73a	46.53a	46.77a	50.02a	46.05a	7.64