不同光质对烤烟质体色素含量及相关酶活性的影响

为明确不同光质条件下，烤烟叶片成熟过程中质体色素代谢的生理响应机制，在大田环境下通过覆盖不同颜色薄膜获得不同光质，研究了不同光质对烤烟生长发育过程中质体色素代谢的影响。结果表明，红、黄光抑制了这一过程中叶绿素的降解，表现在促进了叶绿素a的积累。红光还抑制了类胡萝卜素的降解。与之相比，蓝光相反。黄、红光显著降低了叶绿素酶的活性，蓝光则提高了叶绿素酶的活性。各单色光处理的脂氧合酶活性在成熟末期明显上升，可能延缓叶片的衰老引起质体色素的进一步完全分解，引起烤烟品质的改变。

Effects of Different Lights on Pigments and Related Metabolism Enzyme Activities in Flue-cured Tobacco Leaves

In order to clarify the physiological response mechanism of plastid pigment metabolism in the maturation of flue-cured tobacco leaves under different lights, the effect of different lights on pigment metabolism was investigated on field condition by covering four color films （white, red, yellow, and blue） above tobacco plants. The results showed that the red and yellow light significantly inhibited the degradation of chlorophyll by promoting the accumulation of chlorophyll a. Red light also inhibit the degradation of caroteniods, but the blue light was opposite. At the same time, the red and yellow light reduced the chlorophyllase activity, but the blue light significantly increased it. The activity of LOX in these monochromatic treatments increased significantly in the end of leaf maturity, which could delay the senescence of tobacco leaves and cause a further degrade of pigments. These changes influence tobacco quality.