【摘要】 在300MHz低强度微波电磁场作用下,菠菜和烟草叶片光合细胞叶绿素荧光动力学过程和光合色素呈现不同的变化.菠菜的荧光动力学参量F0和FVI/FV减小,FV/F0、ΔFV/T和FV/Fm升高;烟草的荧光动力学参量F0升高,FVI/FV没有明显变化,FV/F0、ΔFV/T和FV/Fm降低.在微波作用下,菠菜和烟草叶片的光合色素系统的变化也有差异,菠菜和烟草的叶绿素含量均降低,但菠菜的类胡萝卜素含量明显升高.这些结果表明,低强度微波电磁场使烟草叶片光合机构受到抑制,光合色素系统受到破坏,因而光合作用下降;菠菜则通过光合细胞的光合机构中PSⅡ活性中心异质性的转变和光合色素中类胡萝卜素含量的升高来适应微波辐射的环境,使光合作用维持在较高水平.更多还原

【Abstract】 Under the action of low level microwave electromagnetic field of 300MHz,the changes of chlorophyll fluorescence dynamics process and photosynthetic pigment in leaf of spinach and tobaccoare are different.When the fluorescence dynamics parameters F₀ and F VI /F_V of spinach decrease,ΔF_V/T and F_V/F_m increase. The fluorescence dynamics parameter F₀ of tobacco increases,while ΔF_V/T and F_V/F_m decrease. There is a difference between photosynthetic pigment of spinach and tobacco. The content of chlorophyll in leaf of spinach and tobacco decrease,but the content of carotenoid in leaf of spinach increase. These results show that low level microwave electromagnetic field leads to the decrease of potential active of reaction center PSⅡand the photochemical efficiency of PSⅡ in leaf of tobacco.Spinach can keep the photosynthesis in leaf through the change of heterogeneity of PSⅡand the increases of carotenoid.更多还原