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锶对植物光合作用影响尚未见系统研究报道。通过叶绿素荧光诱导动力学和光合气体交换参数详细研究了不同浓度的锶(1、5、10和20mmol.L-1SrCl2)对油菜(Brassica napus)叶片光合作用的影响。荧光诱导动力学分析结果表明,光系统II(PSII)的潜在活性(Fv/Fo)、实际光化学效率(Y(II))、表观光合电子传递速率(ETR)和光化学淬灭(qP)在低浓度(1和5mmol.L-1)锶处理时显著上升,在高浓度(10和20mmol.L-1)锶处理时显著下降;初始荧光强度(Fo)和非光化学淬灭(NPQ)在低浓度锶处理时变化不明显,但在高浓度下显著上升。光合气体交换参数分析结果表明,叶片的净光合速率(Pn)、蒸腾速率(Tr)在低浓度锶处理时显著上升,而在高浓度锶处理时显著下降;气孔导度(Gs)随锶处理浓度的增加一直呈显著下降趋势;胞间CO2浓度(Ci)在低浓度锶处理时轻微下降,高浓度锶处理时显著增加。此外,叶绿素含量在低浓度锶处理时显著增加,在高浓度处理时则显著下降。这些结果均表明,低浓度锶处理可以改善油菜叶片的光合功能,增加叶片光合效率;而高浓度锶则会妨碍叶片光合功能,导致光合效率显著下降。
The impact of strontium on photosynthesis of plants has not been reported systematically. Effects of different concentrations of strontium (1, 5, 10 and 20 mmol.L-1SrCl2) on photosynthesis of Brassica napus leaves were studied in detail by chlorophyll fluorescence induction kinetics and photosynthetic gas exchange parameters. Fluorescence-induced kinetic analysis showed that the potential activity (Fv / Fo), the actual photochemical efficiency (Y (II)), the apparent photosynthetic electron transport rate (ETR) and the photochemical quenching (qP) of photosystem II The concentrations of strontium (1, 5mmol.L-1) and low concentrations of strontium (1 and 5mmol.L-1) significantly increased when treated with high concentrations of strontium (10 and 20mmol.L-1), while the initial fluorescence intensity (Fo) and non-photochemical quenching Low concentrations of strontium treatment did not change significantly, but significantly increased at high concentrations. The analysis of photosynthetic gas exchange parameters showed that the net photosynthetic rate (Pn) and transpiration rate (Tr) of leaves increased significantly at low concentration of strontium and decreased significantly at high concentration of strontium. Stomatal conductance (Gs) The concentration of Ci decreased slightly at low concentration of strontium and increased significantly at high concentration of strontium. In addition, chlorophyll content increased significantly at low concentrations of strontium and decreased significantly at high concentrations. These results indicate that the treatment with low concentration of strontium can improve the photosynthetic function of rape leaves and increase the photosynthetic efficiency of leaves, while the high concentration of strontium interferes with the photosynthetic function of leaves, resulting in a significant decrease in photosynthetic efficiency.