Journal
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
Volume 59, Issue 39, Pages 17103-17112Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.iecr.0c00398
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Funding
- Fundamental Research Funds for the Central Universities [YJ201734]
- Innovation and Entrepreneurship Training Program for Undergraduates of Sichuan University [C2019107170]
- National Natural Science Foundation of China [41406177]
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Microalgal starch, a potential feedstock for renewable fuels and chemicals, is usually induced under stress, which hinders the simultaneous enhancement of starch content and yield. This study applied gamma-aminobutyric acid (GABA) to modulate cell metabolism for improving photosynthetic starch production in microalga Tetraselmis subcordiformis under nitrogen limitation (+/- N) and depletion (-N). Under +/- N, 2.5 mM GABA abated nitrogen metabolism but enhanced starch content by 27% with an uncompromised starch yield due to the moderate inhibition of cell growth and elevated photoprotection. Under -N, 10 mM GABA entitled improved stress tolerance and enhanced starch content by 23.4% with a simultaneous 28.6% promotion of starch yield. The maximum starch content and yield under this condition reached 69.0% DW and 1.84 g L-1, respectively, which represented the highest starch levels in this microalga and exceeded most of the starch production performance among the microalgae reported. GABA addition was promising to improve microalgal starch production.
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