LED红光／蓝光对栅藻LX1生长及产油特性的影响

Effect of LED＇ s Red/Blue Production of Scenedesmus sp. Light on the Growth Characteristic and Lipid LX1

基于藻细胞叶绿素主要吸收可见光中的红光及蓝光用于光合作用，研究了LED红光／蓝光对栅藻LX1生长及产油特性的影响．在I400lx的同等光照强度下，以红光、蓝光和红蓝光为光源时，栅藻LXI的比生长速率分别比白光高出15．8％、13．2％和18．4％，藻细胞密度和种群生物量增长速率也明显大于白光；其中，以红蓝光为光源，栅藻LX1生长最快，培养至第4．5d时，栅藻LX1的藻细胞密度和种群生物量增长速率最高可分别达到白光的2．7倍和3倍．表明LED红光／蓝光的光能效率更高，对栅藻LX1的生长具有明显促进作用．以白光、红光、蓝光、红蓝光为光源时，培养17d栅藻LX1的油脂总产量分别为0．27、0．34、0．31和0．28g·L^-1；油脂含量分别为43．3％、39．5％、36．3％和30．1％．可见，以LED红光／蓝光为光源，栅藻LX1生长得到促进的同时单位藻细胞油脂含量略有下降，但油脂总产量仍相对较高．

Based on the theory that algal chlorophyll mainly absorbs red and blue light in the visual light, the effect of LED＇ s red/blue light on the growth characteristic and lipid production of Scenedesmus sp. LX1 was studied. Under the same light intensity about 1 400 lx, the specific growth rate of Scenedesmus sp. LX1 with LED （light emitting diode） ＇ s red, blue and red-blue light are higher than that with normal white light by 15.8%, 13.2% and 18.4%, respectively. The algal density and population growth rate are also obviously higher than the ones with white light; among the three kinds of LED red/blue light, Scenedesmus sp. LX1 grows the fastest with red-blue light. On day 4. 5 of cultivation, the algal density and population growth rate with LED＇ s red-blue light is as highest as 2.7 and 3 times as that with white light, indicating the higher utilization efficiency of LED＇ s red/blue light and the enhancing effect on Scenedesmus sp. LX1 ＇ s growth. With white light, LED＇ s red, blue and red-blue light, the total lipid productivity of Scenedesmus sp. LX1 after 17 d of cultivation is 0.27 g · L^-1 , 0. 34 g · L^-1 , 0. 31 g · L^-1and 0.28 g · L^-1 , respectively; and the lipid content （dry weight） is 43.3% , 39.5% , 36.3% and 30.1% , respectively. Thus, with LED＇ s red/blue light, the lipid content of Scenedesmus sp. LX1 is a little lower while the growth is enhanced; however, the total lipid productivity is still relatively higher than that with white light.