Title：
Enhanced growth and lipid production of Chlorella pyrenoidosa by plant growth regulator GA3
Authors：
Corresponding
Author：
Kui Du, Huanping Tao, Xiaobin Wen, Yahong Geng and Yeguang Li*
Pubyear：
2015
Title of
Journal：
Fresenius Environmental Bulletin
Paper
Code：
Volume：
24
Number：
10b
Page：
3414-1319
Others：
Classification：
Source：
Abstract：
To investigate the effects of GA3, a plant growth regulator, on lipid production of Chlorella pyrenoidosa XQ- 20044, five levels of GA3 concentration (0 (as control), 0.1,1, 10 and 20 mg L-1) were tested. The results suggested that GA3 enhanced both microalgal growth and lipid accumulation by stimulating esterase activity and regulating intracellular distribution of carbon. Both the maximum lipid content (292.3 mg g-1) and lipid productivity (17.1 mg L-1 d-1) were achieved at 20 mg L-1 GA3. The main fatty acid components were C16 and C18 which accounted for more than 91.5% of the content of total fatty acids at all GA3 concentrations. Moreover, higher GA3 concentrations (10 and 20 mg L-1) increased unsaturated fatty acid content significantly (1.6 times as high as that of the control). The results provided an effective method to enhance the lipid production of microalgae, and could potentially to overcome the current bottleneck in microalgal biodiesel production.
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