Effects of Shading and Light Restoration on Photosynthetic Characteristics of Tomato Leaves during Flowering and Fruit Period

doi:10.3969/j.issn.1000-6362.2019.02.007

Abstract

Abstract: In order to reveal the changes of photosynthetic parameters of tomato leaves under different shading days and the recovery ability of leaf photosynthetic parameters after light restoration, the shading and light restoration experiment on potatoes with solar greenhouse was conducted, taking the infinite-growth-typed tomato “Power Corolla (Lycopersicon esculentum?Mill) ” as material, putting tomatoes in greenhouse during the flowering and fruiting period, and 5 different shading days treatments were designed: T1 (3 days shading), T2 (6 days shading), T3 (9 days shading), T4 (12 days shading) and T5 (15 days shading). The natural light in the greenhouse was used as the control (CK). The results showed that shading decreased the light saturation point and increased the light compensation point of tomato leaves comparing with CK. Net photosynthetic rate of tomato leaf after shading 15 days decreased by 49.0%, and intercellular carbon dioxide concentration increased by 68.3%. With shading days growing, stomatal conductance and transpiration rate decreased quickly after a short increasing, which decreased by 32.9% and 1.60% respectively after shading 15 days. The content of chlorophyll a, chlorophyll b and carotenoids increased by 125.2%, 182.6% and 115.4% respectively when the shading days growing, and the change of chlorophyll b content was significant (P<0.05). Among the fluorescence parameters in tomato leaves, F0 increased with shading days growing, and increased by 30.87% after shading 15 days, while ΦPSⅡ, qP and ETR decreased with the shading days growing, and they decreased by 32.4%, 29.8% and 36.7% respectively after shading 15 days. Nonetheless, the response of Fv/Fm to shading environment was not significant. The shading days had different effects on the recovery ability of different leaf parameters, shading more than 12 days made leaf net photosynthetic rate and intercellular carbon dioxide concentration unable to restore to original state. The chlorophyll content in leaves could not be recovered when shading more than 9 days, the recovery capability of chlorophyll a and carotenoids was better than that of the chlorophyll b. When shading period was less than 9 days, the photosynthetic parameters and chlorophyll content of tomato leaves could be restored to the initial state after the recovery process.

Key words: Tomato, Shading, Light restoration, Photosynthetic parameters, Chlorophyll

ZHU Yu-qing, XUE Xiao-ping. Effects of Shading and Light Restoration on Photosynthetic Characteristics of Tomato Leaves during Flowering and Fruit Period[J]. Chinese Journal of Agrometeorology, 2019, 40(02): 126-134.

References

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