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通过模拟UV-B辐射,探索不同紫外辐射强度、辐射方式对烟草幼苗生长发育、光合生理、色素及多酚、糖类、烟碱等代谢产物的影响,以期探讨烤烟品质形成的生态机理。结果表明:UV-B辐射可使烟苗矮化变粗,叶面积缩小,光合效率下降,但可恢复;UV-B处理叶绿素、糖、烟碱含量下降幅度与辐射强度正相关,但微量UV-B有利于成苗叶绿素含量提高;UV-B辐射可使与植物抗逆性有关的多酚含量得到显著提高,与处理时间、强度正相关;适宜强度的UV-B预处理可使烤烟叶绿素、总类胡萝卜素和总糖含量提高。
Through the simulation of UV-B radiation, explore the different UV radiation intensity, radiation on tobacco seedling growth and development, photosynthetic physiology, pigments and polyphenols, sugars, nicotine and other metabolites, in order to explore the ecological mechanism of flue-cured tobacco quality. The results showed that UV-B radiation could make dwarf and thicker tobacco leaves, reduced leaf area and decreased photosynthetic efficiency, but recovered; UV-B treatment decreased the content of chlorophyll, sugar and nicotine positively correlated with the radiation intensity, -B is beneficial to the increase of chlorophyll content in seedling; UV-B radiation can significantly increase the plant polyphenol content related to plant stress resistance, and is positively correlated with the treatment time and intensity; UV-B pretreatment with appropriate intensity can make chlorophyll , Total carotenoids and total sugar content increased.