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对生菜(Lactuca sativa)分别均匀喷洒浓度为70、140、280μg/L的杀虫剂氰戊菊酯,以清水为对照,以意大利全年耐抽薹生菜为试材,结果表明,随着农药浓度的增加,光系统Ⅱ的最大光化学效率、实际光化学效率、光化学淬灭系数和相对电子传递速率均下降,非光化学淬灭系数、非调节性能量耗散的量子产额和调节性能量耗散的量子产额上升,综合影响造成光系统Ⅱ的中心活性区域缩小、光合速率下降。另外生菜叶片自身的光化合保护机制能在一定程度上减轻农药的胁迫作用。与对照相比,光系统Ⅱ的实际光化学效率受农药影响最大,喷洒浓度为280μg/L的杀虫剂会对生菜光合作用过程产生持续性的、不可逆转的影响。
Spraying insecticides fenvalerate at concentrations of 70, 140 and 280μg / L on Lactuca sativa were sprayed evenly on the lettuce (Lactuca sativa) respectively. The results showed that with the concentration of pesticides , The maximum photochemical efficiency, the actual photochemical efficiency, the photochemical quenching coefficient and the relative electron transfer rate of the photosystem II are decreased, and the non-photochemical quenching coefficient, the uncontrolled energy dissipation quantum yield and the accommodative energy dissipation Quantum yield increased, the combined effect of light system Ⅱ led to the central active area narrowed, photosynthetic rate decreased. In addition lettuce leaves their own light chemical protection mechanism to some extent reduce the stress effect of pesticides. Compared with the control, the actual photochemical efficiency of Photosystem Ⅱ was the most affected by pesticides. Insecticide sprayed at a concentration of 280 μg / L had a sustained and irreversible effect on the photosynthetic process of lettuce.