LED红蓝光对不同品种水培生菜的影响效果对比

Comparison of the Effects on Different Varieties of Hydroponic Lettuce Exerted by LED Red and Blue Light

选取9个不同叶色和叶形的生菜品种,以红蓝光比为7︰1的复合光(RBL)为光源,在植物工厂内对比白光(WL)进行试验,以探究红蓝复合光(RBL)对不同品种生菜(Lactuca sativa L.)的响应差异性及影响效果。结果表明,相比于白光(WL)处理,红蓝光(RBL)促进了绿色散叶生菜品种的株高相对生长速率(P<0.05),但是抑制了其长势过旺;降低了紫色生菜品种后期叶绿素含量;提高了半结球和散叶生菜品种的净光合速率、蒸腾速率和气孔导度(P<0.05);抑制了所有品种生菜PSⅡ的最大光化学效率;提高了散叶生菜品种的ETR值(P<0.05);提高了半结球生菜的可溶性固形物含量和可溶性糖含量(P<0.05);提高了绿色散生生菜品种的维生素C含量、产量和干物率(P<0.05)。总之,红蓝光(RBL)对不同品种生菜生长发育及光合荧光特性的影响差异性主要与叶片离散程度相关,对绿色生菜品种品质和产量的提升效果普遍优于紫色生菜品种。

In this study,nine types of lettuce with different leaf color and leaf shape were selected in this experiment,the light source was set up with compound light whose ratio of red and blue composite light was 7:1,and the contrast experiment was carried out with white light in plant factory.The results showed that compared to the white light(WL)treatment,red and blue(RBL)composite light enhanced the relative growth rate of plant height of green leaf lettuce(P<0.05),but inhibited its overgrowth,and decreased the chlorophyll content of purple lettuce the net photosynthetic large rate,transpiration rate and stomatal conductance of half-enveloped and loose-leaf lettuce varieties were increased(P<0.05).The maximum photochemical efficiency of PSⅡof all varieties of lettuce was inhibited.The ETR value of loose-leaf lettuce varieties was increased(P<0.05);The soluble solid content and soluble sugar content of half-headed lettuce were increased(P<0.05);The content of vitamin C,yield and dry matter rate of green loose-leaf lettuce were increased(P<0.05).In a word,the effect of red and blue composite light on the growth,development and photosynthetic fluorescence characteristics of different lettuce varieties was mainly related to the degree of leaf dispersion,the effect of improving the quality and yield of green lettuce was better than that of purple lettuce.