Abstract:
:This study explored the effects of γ-aminobutyric acid (GABA) on the production of biomass and lipids and on the uptake of Cd2+ by microalgae under cadmium (Cd) stress. Compared with the control and Cd stress alone, 2.5 mM GABA increased the maximum lipid content (55.37%) by 49.37% and 9.42%, respectively. GABA application resulted in increased contents of protein and glutathione (GSH) and in upregulated activity of α-amylase but decreased contents of starch, reactive oxygen species (ROS) and Cd2+, with no effect on subsequent biodiesel quality. Additional analysis of GABA further indicated that increased cellular GABA contents could promote lipid synthesis and reduce Cd accumulation by regulating the expression levels of lipogenesis genes, ROS signalling and mineral nutrient uptake under Cd stress. Collectively, these findings show that GABA not only increases lipid production in microalgae but also is involved in the mechanisms by which microalgae respond to Cd stress.
journal_name
Bioresour Technoljournal_title
Bioresource technologyauthors
Zhao Y,Song X,Zhong DB,Yu L,Yu Xdoi
10.1016/j.biortech.2019.122500subject
Has Abstractpub_date
2020-02-01 00:00:00pages
122500eissn
0960-8524issn
1873-2976pii
S0960-8524(19)31730-4journal_volume
297pub_type
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