Journal
JOURNAL OF APPLIED PHYCOLOGY
Volume 32, Issue 6, Pages 3787-3797Publisher
SPRINGER
DOI: 10.1007/s10811-020-02247-5
Keywords
Chlorophyta; Phytohormones; Biochemical stimulants; Ankistrodesmus falcatus; Lipid; Carbohydrates; Pigments
Funding
- Science and Engineering Research Board, DST, Government of India [SERB-EMR/2016/001016]
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Exogenous supplementation of phytohormones to promote the selective enrichment of biomolecules without hampering biomass production is regarded as a promising approach to improve the techno-economic feasibility of biofuels and other value-added products derived from microalgae. The present work outlines the influence of natural auxin, indole-3-acetic acid (IAA) and two synthetic analogues, 1-naphthalene acetic acid (NAA), and 2,4-dichlorophenoxyacetic acetic acid (2,4-D) on the growth pattern and biochemical productivity of the green algaAnkistrodesmus falcatusCMSACR1001. A maximum biomass production of 431 mg L(-1)with a concomitant increase in the protein and carbohydrate content (20.2% and 49.6% DCW respectively) was achieved under supplementation of 10 mu M IAA. Biomass productivity at 1 mu M concentration was found to be comparable for both IAA and NAA (32.8 mg L-1 day(-1)and 32.4 mg L-1 day(-1)). At higher supplemented concentrations 2,4-D induced a 30-40% increase in carotenoid production and exhibited an increased lipid content of 41-47% DCW as compared with control (34.2% DCW). The current study also reports a substantial increase in the neutral lipid proportion as much as 73.9% and 79% under supplementation of NAA and 2,4-D respectively at 100 mu M. The results indicate that the auxin and its analogues under the study could increase the biomass production and favourably modulate the biochemical composition ofA. falcatus.
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