Environmental Simulation and Pollution Control State Key Joint Laboratory, State Environmental Protection Key Laboratory of Microorganism Application and Risk Control (SMARC), School of Environment, Tsinghua University, Beijing 100084, PR China.
Key Laboratory of Microorganism Application and Risk Control (MARC) of Shenzhen, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, Guangdong, PR China.
Bioresour Technol. 2018 Jan;247:561-567. doi: 10.1016/j.biortech.2017.09.079. Epub 2017 Sep 14.
Microalgae are potential candidates for the production of valuable products, such as renewable biodiesel, health products and pigments. However, low biomass productivity has restricted their large-scale applications. In this study, the effects of two auxins (one natural type of indole-3-acetic acid (IAA) and the other synthetic type of 2,4-dichlorophenoxyacetic acid (2,4-D)) on the growth and fatty acid methyl esters (FAMEs) production of a freshwater microalgae Scenedesmus sp. LX1 were investigated. Both auxins showed a "low dosage-promotion and high dosage-inhibition" effect on the growth and FAMEs accumulation. The optimum dosage of IAA and 2,4-D were 1mgL and 0.1mgL, respectively. Moreover, the IAA could increase the monounsaturated fatty acid content. The auxins may promote the growth by enhancing the photosynthetic activity through increasing chlorophyll contents. Therefore, auxin significantly enhanced microalgal growth and FAMEs accumulation, and has a potential for application in developing efficient microalgal cultivation.
微藻是生产有价值产品的潜在候选者，例如可再生生物柴油、保健品和色素。然而，低生物质生产力限制了它们的大规模应用。在这项研究中，两种植物生长素（一种天然类型的吲哚-3-乙酸（IAA）和另一种合成类型的 2,4-二氯苯氧乙酸（2,4-D））对淡水微藻 Scenedesmus sp. LX1 的生长和脂肪酸甲酯（FAMEs）生产的影响进行了研究。两种植物生长素对生长和 FAMEs 积累都表现出“低剂量促进和高剂量抑制”的作用。IAA 和 2,4-D 的最佳剂量分别为 1mg/L 和 0.1mg/L。此外，IAA 可以增加单不饱和脂肪酸的含量。植物生长素可能通过增加叶绿素含量来增强光合作用活性，从而促进生长。因此，植物生长素显著提高了微藻的生长和 FAMEs 的积累，在开发高效微藻培养方面具有应用潜力。
