Light-emitting diodes (LEDs) have been developed as light sources for indoor algae cultivation. In this study, we determined the effects of blue and red light ratios on weight gain, pigment content, antioxidant activity, and phytoene desaturase (PDS) gene expression in Caulerpa lentillifera. Caulerpa lentillifera was grown under six LED light treatments: white (W), red (R, 660 nm, 100%), blue (B, 447 nm, 100%), 1B1R (50% blue + 50% red), 1B2R (33.3% blue + 66.7% red), and 1B5R (16.7% blue + 83.3% red). Our results showed that red light improved the weight gain percentage of C. lentillifera, whereas red light with a low proportion of blue light (1B5R, 16.7%; blue + 83.3% red) led to a significantly higher weight gain percentage and photosynthetic pigment (Chl a + Chl b) content than the other LED light treatments. Increasing the proportion of blue light negatively affected weight gain and the photosynthetic pigment contents. However, blue LED light induced significantly higher transcription of the PDS gene, which coincided with increased β-carotene accumulation and antioxidant activity in C. lentillifera. These results indicated that the ratio of blue to red light is important for the indoor cultivation of C. lentillifera, and 100 μmol photons m⁻² s⁻¹ of 1B5R LED light with a 12/12 h light-dark photoperiod resulted in good growth and development.

已经开发出发光二极管（LED）作为用于室内藻类栽培的光源。在这项研究中，我们确定了蓝光和红光比率对长白刺菜中增重，色素含量，抗氧化活性和八氢番茄红素去饱和酶（PDS）基因表达的影响。菜豆（Caulerpa lentillifera）在六种LED光处理下生长：白色（W），红色（R，660 nm，100％），蓝色（B，447 nm，100％），1B1R（50％蓝色+ 50％红色），1B2R（ 33.3％蓝色+ 66.7％红色）和1B5R（16.7％蓝色+ 83.3％红色）。我们的结果表明，红光改善了扁豆梭菌的增重百分比，而具有较低比例的蓝光的红光（1B5R，16.7％；蓝色+ 83.3％的红色）导致重量增加百分比和光合色素（Chl a  + Chl b）含量明显高于其他LED光处理。蓝光比例的增加会对重量增加和光合色素含量产生负面影响。然而，蓝光LED诱导了PDS基因的显着更高的转录，这与增加的C. lentillifera中的β-胡萝卜素积累和抗氧化活性相吻合。这些结果表明，蓝光与红光的比率对于扁豆梭菌和100μmol光子m ^-2的室内培养非常重要。 s ^-1的12B / 12 h暗光周期的1B5R LED灯导致良好的生长和发育。