Abstract
Seaweed, a valuable marine resource widely cultivated worldwide, can be vulnerable to stress and microbiome alterations, resulting in the decay of seaweeds and substantial economic losses. To investigate the seaweed-microbiome interaction, our study aimed to isolate marine bacteria and fungi that can cause Ice–Ice disease and evaluate their enzymatic characteristics for potential application in bioethanol production from seaweed biomass. Three red seaweed species (Gracilaria edulis, Kappaphycus alvarezii, and Eucheuma cottonii) were obtained for our study and placed in separate culture tanks. Among the 18 isolated marine microbial species, 12 tested positive for agar and carrageenan activity: six exhibited both activities, three displayed only agar activity, and three only carrageenan activity. DNA sequencing of the positive microbes identified ten bacteria and two yeast species. The 3,5-Dinitrosalicylic acid (DNSA) assay results revealed that the identified bacterial Caldibacillus kokeshiiformis strain FJAT-47861 exhibited the highest carrageenase activity (0.76 units/ml), while the yeast Pichia fermentans strain PM79 demonstrated the highest agarase activity (0.52 units/ml). Notably, Pichia fermentans strain PM79 exhibited the highest overall agarase and carrageenase activity, averaging 0.63 units/ml. The average carrageenase activity of all six positive microbes was 1.5 times higher than their agarase activity. These findings suggest that the 12 isolated microbes hold potential for bioethanol production from macroalgae, as their agarase and carrageenase activity indicates their ability to break down seaweed cell wall carbohydrates, causing ice–ice disease. Moreover, these results provide exciting prospects for harnessing the bioconversion capabilities of these microbes, paving the way for sustainable and efficient bioethanol production from seaweed resources.
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Acknowledgements
We thank the seaweed farmers from Rameshwaram, India and specifically Brahma Kamal Research LLP, India for standardizing the seaweed cultivation in the field and providing seaweed samples for this study.
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The authors gratefully acknowledge the Science and Engineering Research Board (SERB), Department of Science and Technology, Government of India (SRG/2022/002212) for their financial assistance.
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PS conceptualized and ideated this research under the mentorship of AC and GDB, PS performed the formal analysis and experiments. KKJ and AC assisted in the lab investigations. GDB, PKS, and VN arranged the funding and resources. PS wrote the full original manuscript draft, and GDB did the final edit. All authors read and approved the final manuscript.
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Saravanan, P., Chatterjee, A., Kiran, K.J. et al. Exploring Seaweed-Associated Marine Microbes: Growth Impacts and Enzymatic Potential for Sustainable Resource Utilization. Indian J Microbiol (2024). https://doi.org/10.1007/s12088-024-01205-w
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DOI: https://doi.org/10.1007/s12088-024-01205-w