Effects of shading time on the growth and photosynthetic physiological characteristics of cigar wrapper leaves

doi:10.16178/j.issn.0528-9017.20250172

Abstract

Abstract:

This study aims to clarify the impact of shading time on the growth and development, photosynthetic physiological characteristics of and cigar wrapper leaves and physical characteristics of cured cigar leaves. Using the cigar variety Chuxue 80 (CX-80) as the material, four treatments were established: no shading (T1), shading throughout the whole growth period (T2), shading from the 20 days after transplanting (T3), shading from the 40 days after transplanting (T4). The effects of shading time on the plant height, leaf morphology, photosynthetic characteristics, physical properties of cured leaves and vein thickness of CX-80 were analyzed. The results showed that shading throughout the whole growth period (T2) significantly increased the plant height and maximum leaf length but reduced the stem circumference. Shading before the twentieth days after transplanting significantly reduced the net photosynthetic rate (P_n), stomatal conductance (G_s), and transpiration rate (T_r), as well as lower relative leaf temperature and thinner leaves. Chlorophyll fluorescence parameter analysis showed that, with the increase of shading time, the initial fluorescence (F_o) increases, the maximum fluorescence (F_m), the actual photochemical efficiency Y(Ⅱ), photochemical quenching coefficient (q_P) and non-photochemical quenching coefficient (q_N) gradually decreased. Leaf environmental scanning electron microscope results showed that, with the increase of shading time, the number of leaf stomata decreased and the stomata area and circumference gradually increased. After curing and fermentation, the stalk rate, leaf vein diameter and main and branch vein diameter gradually decreased. In conclusion, shading time affects the growth and development of cigar leaves, photosynthetic physiological characteristics and the physical characteristics of cured tobacco leaves, with potential to modify the growing environment and improve the availability of cigar wrapper leaves through different shading cultivation measure. So, shading from 20 days after transplanting can be recommended for application in Enshi cigar planting area.

Key words: cigar leaves, shading time, growth and development, photosynthesis, stomata development, physical characteristics

CLC Number:

S572

SONG Hao, ZHANG Wenhan, WANG Yanyan, QIAO Baoming, DU Fu, ZHAO Zeyu, FAN Wenpeng, WANG Haoli, SHAN Yujing, TIAN Lijun, LI Ziwei, LIU Liping, YANG Yongxia. Effects of shading time on the growth and photosynthetic physiological characteristics of cigar wrapper leaves[J]. Journal of Zhejiang Agricultural Sciences, 2025, 66(6): 1369-1376.

Figures/Tables 10

Fig.1 Agro nomic traits of cigar under different shading time

Fig.2 Leaf thickness of cigar under different shading time

Fig.3 Development of cigar leaf stomata under different shading time

Fig.4 SPAD value of cigar leaves under different shading time

Fig.5 Photosynthetic parameters of cigar leaves under different shading time

Fig.6 The chlorophyll fluorescence parameters of cigar leaves under different shading time

Fig.7 Thermal imaging pictures of cigar under different shading time

Fig.8 Leaf temperature of cigar under different shading time

Table 1 Physical properties of cigar leaves under different shading time

处理	拉力强度/ N	含梗率/ %	平衡含水率/ %	叶片厚度/ μm
T1	1.33 b	29.77 a	20.76 a	56.01 a
T2	1.44 a	28.58 b	19.67 c	46.15 c
T3	1.42 ab	28.78 b	19.80 bc	48.45 c
T4	1.37 ab	29.61 a b	20.05 b	52.04 b

Fig.9 Diameter of main and branch veins after curing in different shading time

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