The Effects of LED Illumination Patterns on Yield and Quality of Spirulina platensis under the Same Daily Light Integral ( DLI)
Appropriate lighting modes can promote the growth and accumulation of metabolites in Spirulina. This experiment investigates the effects of different light quality combinations and photoperiods on the growth rate,dry biomass yield and morphological development of Spirulina under the same DLI. The experiment set up five treatment conditions:red light with a photoperiod of 16 h/8 h and 24 h/0 h,red-blue light ( light intensity ratio of 9∶1 ) with photoperiod of 16 h/8 and 24 h/0 h,and alternating red-blue light ( light intensity ratio of 4.5∶1,with red light for 16 h and blue light for 8 h). After six days of Spirulina cultivation,the growth rate,dry biomass yield,morphological development,chlorophyll content,and phycocyanin content of Spirulina in each treatment were measured and analyzed. The results showed that the growth rate and dry biomass yield of Spirulina platensis were the highest under the condition of 16 h∶8 h photoperiod,and the final yield reached 0.81 g,and its phycocyanin content was also the highest at 1.21 mg/g. The addition of blue light is beneficial to the accumulation of photosynthetic pigments in Spirulina,and the contents of chlorophyll a and phycocyanin after the addition of blue light are higher than those in the single red light treatment group. On the other hand,the growth of Spirulina platensis was inhibited by 24 h light irradiation,and the yield was reduced,but the growth of Spirulina platensis was not inhibited by alternating red and blue light irradiation,and the chlorophyll a content reached the highest of 8.83 mg/g,which indicated that it was feasible to replace the dark phase with appropriate blue light irradiation.
万方数据
维普
