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Identification and characterization of chitinase-producing bacteria from gut of pleurostict scarab beetle grubs (Coleoptera: Scarabaeidae)

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International Journal of Tropical Insect Science Aims and scope Submit manuscript

Abstract

An investigation was conducted to isolate, identify and molecularly characterize the chitinase-producing bacterial isolates from the guts of four pleurostict scarab beetle larvae [one species belonging to subfamily Rutelinae (Anomala bengalensis) and three species belonging to subfamily Melolonthinae (Brahmina coriacea, Holotrichia setticollis and Holotrichia longipennis)] through 16 S rRNA sequencing. A total of 74 chitinase-producing bacterial strains were isolated from different gut compartments of selected species; of which 20 bacterial isolates recorded a clear halo zone of ≥ 5 mm (diameter) around the bacterial colony indicating chitinase activity. These 20 chitinase-producing bacteria were selected and sequenced for the 16 S rRNA gene. Maximum chitinase-producing bacteria were isolated from the fermentation chamber of all the selected scarab beetle larvae. The chitinase-producing bacterial community was represented by only two phyla i.e., Firmicutes and Actinobacteria. Bacillus was the most dominant group with 17 isolates. In addition to this, the insecticidal properties of chitinase-producing bacterial isolates were evaluated against mustard aphid (Lipaphis erysimi). Maximum per cent mortality was recorded by Bacillus licheniformis strain CHG3FC1 i.e., 30.00 ± 10.00% 72 h after treatment. Thus, the experiment proved that scarab beetle larvae possess great potential to be a source of novel chitinolytic bacteria, that can be exploited for management of phyto-pathogenic fungi, bacteria and insect pests.

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Acknowledgements

Thanks are due to The Director, ICAR-Vivekananda Parvatiya Krishi Anusandhan Sansthan, Almora, Uttarakhand, India for providing the necessary facilities to conduct this research work. The study is financially supported by the All India Network Project on White Grubs and Soil Arthropod Pests.

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N. K., J. S., (A) R. N. S. S. and I. (B) originally formulated the idea and designed the experiment. N. K. and J. P. G. did the experiment and collected the data. A. P. and A. K. S. helped in the analysis and interpretation. N. K. and A. P. drafted the manuscript. All authors contributed critically to the manuscript and gave final approval for publication.

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Correspondence to Amit Umesh Paschapur.

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All the authors (Nutan Karki, Amit Umesh Paschapur, ARNS Subbanna, Johnson Stanley, Ashish Kumar Singh, Ila Bisht, Jai Prakash Gupta) have approved to submit the article to “International Journal of Tropical Insect Science” and we confirm that the article has not been published elsewhere and is not under consideration by any other journal. The authors declare no competing interests.

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Karki, N., Paschapur, A.U., Subbanna, A.R. et al. Identification and characterization of chitinase-producing bacteria from gut of pleurostict scarab beetle grubs (Coleoptera: Scarabaeidae). Int J Trop Insect Sci 43, 1539–1551 (2023). https://doi.org/10.1007/s42690-023-01049-9

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  • DOI: https://doi.org/10.1007/s42690-023-01049-9

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