Abstract
The influence of 12 biochemical stimulants, namely 2-phenylacetic acid (PAA; 30 ppm), indole-3 butyric acid (IBA; 10 ppm), 1-naphthaleneacetic acid (NAA; 2.5, 5 and 10 ppm ), gibberellic acid (GA3, 10 ppm), zeatin (ZT; 0.002 ppm), thidiazuron (0.22 ppm), humic acid (20 ppm), kelp extract (250 ppm), methanol (500 ppm), ferric chloride (3.2 ppm ), putrescine (0.09 ppm), spermidine (1.5 ppm) were prescreened for their impact on growth and chlorophyll for the green alga—Chlorella sorokiniana. C. sorokiniana responded best to phytohormones in the auxin family, particularly NAA. Thereafter, two studies were conducted on combinations of phytohormones to compare blends from within the auxin family as well as against other families. These treatments were NAA5 ppm+PAA30 ppm, NAA2.5 ppm+PAA15 ppm, NAA5 ppm+IBA10 ppm, NAA5 ppm+GA310 ppm, NAA5 ppm+ZT1 ppm, and NAA5 ppm+GA310 ppm+ZT1 ppm. Combinations of NAA with other auxins did not have synergistic or antagonistic effects on the growth. However, combinations of compounds from different phytohormone families, such as NAA5 ppm+GA310 ppm+ZT1 ppm, dramatically increased the biomass productivity by 170% over the control followed by the treatments: NAA 5 ppm+GA310 ppm (138%), NAA 5 ppm+ZT1 ppm (136%), and NAA 5 ppm ( 133%). The effect of biochemical stimulants were also measured on metabolites such as chlorophyll, protein, and lipids in C. sorokiniana. Renewed interest in microalgae for biotechnology and biofuel applications may warrant the use of biochemical stimulants for cost reduction in large-scale cultivation through increased biomass productivity.
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We gratefully acknowledge the support of the US Department of Energy and State of Georgia that funded this project as part of the Biorefining and Carbon Cycling research program.
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Hunt, R.W., Chinnasamy, S., Bhatnagar, A. et al. Effect of Biochemical Stimulants on Biomass Productivity and Metabolite Content of the Microalga, Chlorella sorokiniana . Appl Biochem Biotechnol 162, 2400–2414 (2010). https://doi.org/10.1007/s12010-010-9012-2
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DOI: https://doi.org/10.1007/s12010-010-9012-2