UV-B对不同烤烟品种质体色素的影响

[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素含量。[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1.5 h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3.0 h的UV-B照射处理7 d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。

Effects of UV-B on the Plastid Pigment Content of the Different Flue-cured Tobacco Cultivars

[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.