关键词: 茶多酚, 光合特性, 多酚, 烤烟

Abstract: In order to explore the application of tea polyphenols in flue-cured tobacco production,different amounts of tea polyphenols [0(CK),25,50,75 mg/ plant] were sprayed (50 mL) on the upper leaves of tobacco at 1 d and 7 d after topping to study the effects on photosynthetic characteristics and polyphenol content of flue-cured tobacco leaves by using Yunyan 206 as the test material.The results showed that,compared with CK,spraying 25—50 mg/ plant of tea polyphenols after topping increased the net photosynthetic rate,transpiration rate,stoma conductance,apparent CO₂ utilization rate and apparent energy utilization rate of flue-cured tobacco leaves.The effect of 25 mg/plant tea polyphenols treatment was the most significant.The SPAD value of tobacco leaves decreased with the increase of the tea polyphenol amount.The amount of tea polyphenols was significantly positively correlated with the content of chlorogenic acid,caffeic acid and rutin in tobacco leaves after topping;however,a series of processes from tobacco topping to tobacco leaf ripening, harvesting and curing weakened the effect of tea polyphenols on the polyphenol content of tobacco leaves. In addition, there was a certain correlation between the photosynthetic characteristics and polyphenol content of tobacco leaves. In general,under the experimental conditions,spraying 50 mg/plant of tea polyphenols after topping had the best effect,which could greatly enhance the photosynthetic assimilation ability of tobacco leaves,and the contents of caffeic acid and rutin in tobacco leaves were the highest after roasting.

Key words: Tea polyphenols, Photosynthetic characteristics, Polyphenols, Flue-cured tobacco