Abstract
The main aim of the present study was to determine the effects of a seaweed-based biostimulant’s supplementation on the growth of Chlorella variabilis. A liquid extract from Kappaphycus alvarezii (K-sap) was prepared and supplemented in the growth medium from 0.2 to 5% concentrations. The supplementation of K-sap increased the growth and photosynthetic performance of C. variabilis. Addition of 0.4% K-sap increased the biomass production by about 59% compared to the control culture. The highest lipid and neutral lipid productivities were observed in 0.6% K-sap-supplemented culture, which were around 50 and 100% higher than that of the control culture, respectively. Addition of 1% K-sap increased the carbohydrate accumulation in the cells by about 50%. These results suggest that the supplementation of a seaweed-based biostimulant effectively enhances the growth and biofuel potential of microalgae.





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Acknowledgements
CSIR-CSMCRI Registration Number: 132/2018. The authors acknowledge M/s Aquagri for providing the K-sap prepared using the technology granted by CSIR-CSMCRI. HS acknowledges Maulana Azad National Institute of Technology, Bhopal, and CSIR-Central Salt and Marine Chemicals Research Institute, Bhavnagar, for the opportunity to conduct his dissertation. Analytical support from AESD&CIF, CSIR-CSMCRI is gratefully acknowledged.
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KC and RS acknowledge their funding support with the CSIR-SRF and DST-INSPIRE award and AcSIR for their Ph.D. enrolment.
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Sati, H., Chokshi, K., Soundarya, R. et al. Seaweed-based biostimulant improves photosynthesis and effectively enhances growth and biofuel potential of a green microalga Chlorella variabilis. Aquacult Int 29, 963–975 (2021). https://doi.org/10.1007/s10499-021-00667-9
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DOI: https://doi.org/10.1007/s10499-021-00667-9


