UV-B对不同烤烟品种质体色素的影响

摘要

[ Objective ] The aim was to study the effects of UV-B on the plastid pigment content of the different flue - cured tobacco cultivars, and discuss the influencing mechanism to quality of flue - cured tobacco. [ Method] Three varieties of Honghuadajinyuan, K326 and Yunyan 87 were radiated on 5 different UV-B radiation intensities. The fresh leaves of tobacco were collected after 7, 14, 21 and 28 days of treatment to detect chlorophyll and carotenoid content. [ Result] The results show that effects of the ultraviolet on plastid pigment content of different flue - cured tobacco varieties depend on UV-B intensity and irradiation time. And the differences among different varieties were very large. 30% less ultraviolet radiation treatment for 28 days leads to the plastid pigment content of middle leaf of K326 and Yunyan 87 increasing, and no change for Honghuadajinyuan. For more 1.5 h UV-B irradiation of treatment, plastid pigment content of all 3 varieties reduces after 28 days. And for more 3.0 h ultraviolet irradiation of treatment for 7 days, plastid pigment content of Honghuadajinyuan and K326 increased, chlorophyll content of Yunyan 87 decreased, carotenoid content increased. [Conclusion] This study provides important theory basis for the effects of UV-B on plastid pigment of different flue - cured tobacco varieties, improving the quality of tobacco and rational deploy of tobacco varieties.%[目的]研究不同UV-B强度对烤烟质体色素含量的影响,探讨UV-B对烤烟品质的影响机理.[方法]采用5个不同的UV-B辐射强度,对3个品种红花大金元、K326和云烟87,旺长期烟株进行辐射处理,分别采集处理7、14、21和28 d后的新鲜叶片测定叶绿素和类胡萝卜紊含量.[结果] UV-B对不同烤烟品种质体色素含量的影响随UV-B强度和照射时间而变化,且不同品种之间的差异较大.减弱30％ UV-B处理28 d后,导致K326和云烟87中部叶质体色素含量升高,但对红花大金元的影响则不显著.而增加1.5h的UV-B照射,28 d后3个品种的质体色素含量均降低.而增强3.0h的UV-B照射处理7d后,红花大金元和K326质体色素含量升高,云烟87的叶绿素含量降低,类胡萝卜素含量升高.[结论]该研究可以为提高烟叶品质和品种的合理布局提供重要的理论依据.