【摘要】 为探究光质与钾浓度交互对紫叶生菜生长、品质的影响，进而筛选紫叶生菜最适光质与钾浓度交互模式。试验以‘紫罗马’紫叶生菜为试验材料，以白色荧光灯（L1）为对照，另设3种LED光质处理；同时基于Hoagland营养液配方，设置6个钾浓度处理，共24个处理。光质处理30 d后采收并测定紫叶生菜生物量、营养及品质相关指标。结果表明，不同光质与钾浓度交互模式对紫叶生菜生长、营养与品质存在一定影响。（1）生长方面，不同光质与60、90、120、150μg·mL^-1钾浓度交互时，对地上部鲜质量（产量）与根系总长提升效果较优者均为红光。不同钾浓度与红光、蓝光、红蓝复合光交互时，对产量、叶面积、根系总长提升效果较佳者为150μg·mL^-1钾浓度。而不同光质与钾浓度交互模式下，红光与150μg·mL^-1钾浓度交互对产量提升效果最佳，较同钾浓度的白光处理提高59.52%;蓝光与150μg·mL^-1钾浓度交互对株高、叶面积及根系生长存在促进作用，综合效益最佳。较同钾浓度的白光处理，蓝光与150μg·mL^-1钾浓度交互模式株高、叶面积、地下部鲜质量与根体积分别提高27.94%、49.06%、78.74%、169.35%。（2）营养与品质方面，不同光质与60、90、120μg·mL^-1钾浓度交互时，提高可溶性蛋白与可溶性糖含量效果较佳者为红光；与150、180μg·mL^-1钾浓度交互，各光质均可提高维生素C含量并降低硝酸盐含量。而不同钾浓度与白光、蓝光、红蓝复合光交互时，提高可溶性糖与维生素C含量效果较佳者均为150μg·mL^-1钾浓度。而不同光质与钾浓度交互模式下，蓝光与150μg·mL^-1钾浓度交互对品质指标综合提升效果最佳。较同钾浓度的白光处理，蓝光与150μg·mL^-1钾浓度交互模式的可溶性糖、可溶性蛋白与维生素C含量分别提高158.53%、14.07%、8.05%;而对光合色素与花青素提升效果最佳的分别为红蓝光与120μg·mL^-1钾浓度交互、蓝光与180μg·mL^-1钾浓度交互。综上所述，不同光质与钾浓度交互模式对紫叶生菜生长与品质影响不同，结合隶属函数进行综合指标评定，得出蓝光与150μg·mL^-1钾浓度交互为紫叶生菜最佳管理模式。而为进一步提高紫叶生菜产量，可选择红光与150μg·mL^-1钾浓度交互；进一步提高花青素含量，可选择蓝光与180μg·mL^-1钾浓度交互进行生产。更多还原

【Abstract】 Light quality and potassium ion concentration play an important role in plant growth and development. In order to explore the effect of the interaction between light quality and potassium concentration on the growth and quality of purple lettuce, the optimal interaction mode of light quality and potassium concentration was determined. The experiment used ‘violet romana’ purple leaf lettuce as the test material, white fluorescent lamp（L1） as the control, three LED light quality treatments were set up. Based on the Hoagland nutrient solution formula, six potassium concentration treatments were also set up, with a total of 24 treatments. After light quality treatment, 30 days after harvesting, the biomass and nutrition and quality indexes of purple leaf lettuce were determined. The results showed that different modes of interaction between light quality and potassium concentration had a certain effect on the growth, nutrition and quality of purple lettuce.（1） In terms of growth, when different light qualities interacted with 60,90,120,150 μg·mL^-1 potassium concentrations, the ones with better effect on the fresh mass（yield） of the aboveground and the total length of the root system were all red light. When different potassium concentrations interacted with red, blue and red-blue composite light, a potassium concentration of 150 μg·mL^-1 was most effective for increasing yield, leaf area and total root length. In the interaction mode of different light quality and potassium concentration, the interaction between red light and 150 μg·mL^-1 potassium concentration had the best effect on yield improvement, which was 59.52% higher than that of white light treatment with the same potassium concentration. The interaction between blue light and 150 μg·mL^-1 potassium concentration promoted plant height, leaf area and root growth, and the comprehensive benefits were the best. Compared with the white light treatment with the same potassium concentration, the plant height, leaf area, underground fresh mass and root volume of blue light and 150 μg·mL^-1 potassium concentration increased by 27.94%,49.06%,78.74% and 169.35%,respectively.（2） In terms of nutrition and quality, when different light qualities interact with 60,90,120 μg·mL^-1 potassium concentration, the better effect of increasing soluble protein and soluble sugar content was red light; interacting with potassium concentrations of 150 and 180 μg·mL^-1,each light quality could increase vitamin C content and reduce nitrate content. When different potassium concentrations interacted with white light, blue light, red and blue composite light, the potassium concentration of 150 μg·mL^-1 was 150 μg·mL^-1 was most effective for increasing soluble sugar and vitamin C content. In the interaction mode of different light quality and potassium concentration, the interaction between blue light and 150 μg·mL^-1 potassium concentration had the best effect on improving overall quality indexes. Compared with the white light treatment with potassium concentration, the contents of soluble sugar, soluble protein and vitamin C in the interaction mode of blue light and 150 μg·mL^-1 potassium concentration increased by 158.53%,14.07% and 8.05%,respectively. The best enhancement effects on photosynthetic pigments and anthocyanins were red and blue light interacting with 120 μg·mL^-1 potassium concentration and blue light interacting with 180 μg·mL^-1 potassium concentration. In summary, the interaction mode of different light quality and potassium concentration on the growth and quality of purple lettuce is different, and the comprehensive index evaluation combined with the membership function shows that the interaction between blue light and 150 μg·mL^-1 potassium concentration is the best management mode of purple lettuce. In order to further increase the yield of purple leaf lettuce, red light can be selected to interact with 150 μg·mL^-1 potassium concentration. To further increase anthocyanin content, blue light can be combine with a potassium concentration of 180 μg·mL^-1.更多还原