遮阳对白花前胡叶片光合特性的影响

Effect of Shading on Photosynthetic Characteristics of Peucedanum praerupterumLeaves

为规范白花前胡(Peucedanum praerupterum)种植和提高产量,对不同光强下白花前胡的光合特性进行了研究。结果表明,与遮阳40%和60%相比,对照(CK)和遮阳20%的白花前胡叶片具有更高的最大电子传递速率[分别为247.129和266.866μmol/(m^(2)·s)]和最大净光合速率[分别为25.621和28.167μmol/(m^(2)·s)],且最大净光合速率对应的饱和光强[分别为2130.419和1927.804μmol/(m^(2)·s)]也显著高于遮阳40%和60%处理。不同遮阳处理的白花前胡叶片的光能利用效率和水分利用效率有差异,但光化学猝灭系数和非光化学猝灭系数则无显著差异。这说明白花前胡为典型的阳生植物,光适应性较强,建议选择光强充足的开阔田地栽培白花前胡。

To regulate planting and increase yield of Peucedanum praerupterum,the photosynthetic and fluorescence characteristics were studied under different shading,such as full sunlight(CK)and shading 20%,40%,60%.The results showed that the maximum electron transfer rate was 247.129 and 266.866μmol/(m^(2)·s)under CK and shading 20%,with maximum net photosynthetic rate of 25.621 and 28.167μmol/(m^(2)·s),respectively,which were significantly higher than that of shading 40%and 60%(P<0.05).The saturated light intensity corresponded to the maximum net photosynthetic rate under CK and shading 20%were 2130.419 and 1927.804μmol/(m^(2)·s),respectively,which were significantly higher than thoseunder shading 40%and 60%.The light energy use efficiency and water use efficiency of P.praerupterumleaves haddifferences amongdifferent shading treatments,whilethe photochemical quenching coefficient and non-photochemical quenching coefficient had no significant difference.Therefore,it was suggestedthat P.praerupterumwas a typical heliophytewithstrong adaptability,so that it was beneficial to choose the open field with sufficient light intensity for the cultivation of P.praerupterum.