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Cellulolytic Potential of Lysinibacillus fusiformis Strain WGI4 Isolated From White Grub Beetle Phyllophaga sp. (Coleoptera: Scarabaeidae) Larvae Gut

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Abstract

Thirteen cellulolytic bacteria were isolated, screened and characterized from the larval guts of grub beetle Phyllophaga sp. To delimit the growth of non-cellulolytic bacteria, the isolated bacteria were grown directly on selective medium containing Carboxymethyl cellulose (CMC) as sole carbon source. The potent cellulase producing isolate was further subjected to morphological, biochemical and molecular characterization. A gram positive, rod shaped motile isolate WGI4 showed maximum endonuclease (or CMCase) activity of 0.93 IU/ml and exonuclease (or FPase) activity of 1.8 IU/ml at temperature 37 °C and alkaline pH between 24 and 48 h of incubation. Based on 16S rRNA gene analysis the strain was found to be most closely related to Lysinibacillus sphaericus, L. cavernae, L. macroides (99.01%, 99.01%, 98.87% similarity, respectively) and identified as Lysinibacillus fusiformis. Further, the larvae gut was subjected to scanning electron microscopic study which revealed presence of abundant rod shaped bacteria firmly attached to the gut wall. To the best of our knowledge this is the first report of SEM study of white grub beetle Phyllophaga sp. larvae gut and isolation of a novel bacterial strain.

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Data Availability

(Data Transparency) Data used in this study are available from the author. The 16 S rRNA partial sequence of Lysinibacillus fusiformis strain WGI4 have been submitted at NCBI bearing accession number MZ_355626.1.

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Acknowledgements

The authors are grateful to Microbial Type Culture Collection and Gene Bank (MTCC), CSIR Institute of Microbial Technology, Chandigarh, India for timely identification of the bacterial isolate WGI4, and to the Botanical Survey of India, Eastern Regional Centre, Shillong, Meghalaya, India for providing Scanning Electron Microscope (SEM) facility.

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This research received no external funding.

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DP and AB: conceptualization, supervision, review and editing. SB: investigation and formal analysis, experiments, and analysis of results, writing original draft.

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Correspondence to Sumita Biswas.

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Biswas, S., Paul, D. & Bhattacharjee, A. Cellulolytic Potential of Lysinibacillus fusiformis Strain WGI4 Isolated From White Grub Beetle Phyllophaga sp. (Coleoptera: Scarabaeidae) Larvae Gut. Proc Zool Soc 77, 116–125 (2024). https://doi.org/10.1007/s12595-024-00514-8

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  • DOI: https://doi.org/10.1007/s12595-024-00514-8

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