Abstract
Information on the bacterial symbiosis/interactions is lacking in tasar silkworm Antheraea mylitta Drury. The detailed midgut bacterial diversity and their functions were elucidated for the first time in tasar silkworm. Taxonomic annotation of fifth instar larval midgut bacteria of three major ecoraces namely Daba, Modal and Raily was carried out using Illumina Next-Generation Sequencing. The dominant phyla and genus are Proteobacteria and Pseudomonas respectively, irrespective of the ecorace. The bacterial diversity & functions varied among ecoraces due to diet & geography. Predictive functional analysis through PICRUSt, revealed many important functional roles of gut bacteria in digestion, detoxification, amino-acid synthesis, etc. Metabolic pathways related to metabolism of amino acids, carbohydrates, lipids, plant secondary metabolites and membrane transport are the most significant gut bacterial functions. Loss of native gut bacteria following the antibiotics treatment reduced the silkworm fitness. We found significant symbiotic role between silkworm and midgut bacteria mediated through various physiological functions. The information obtained from this study helps to enrich the knowledge and could contribute to engineer the functions for the enhancement of silk yield and quality through probiotics.
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Acknowledgments
Present study was carried out with the funds of Central Silk Board (Code: PIP 4716, CTRTI/PMEC/TECH-60/2016-17/8846). We thank Dr. P.K. Kar, Scientist-D, Baripada, CSB for helping in the procurement of Modal ecorace larvae. We thank Dr. Jaipal Choudhary, Scientist, ICAR-RCER, Ranchi & Dr. Rahul Benerjee, Scientist, ICAR-IASRI, New Delhi for their valuable help in bioinformatics.
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MMB and Alok conceived the project. MMB designed and performed the experiments, analysed the metagenomic data and wrote the manuscript. Prabhu & Manjappa helped in the investigation and methodology. Singh & Sathyanarayana provided the necessary inputs during the experiments. All the authors gave final approval for the manuscript.
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42690_2023_1006_MOESM1_ESM.docx
Supplementary file1 Life cycle of Tasar Silkworm Antheraea mylitta Drury. a: mating, b: Hatching, c-f: II, III, IV and V instar larvae respectively, g: Cocoon with peduncle, h: Adult moth (DOCX 16 KB)
42690_2023_1006_MOESM2_ESM.jpg
Supplementary file2 The phylogenetic tree of A.mylitta larval midgut bacteria. Phylogenetic tree with seed value of 100 and bootstrapping value of 1000. a. Modal, b. Raily, c. Daba (JPG 1063 KB)
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Baig, M.M., Singh, G., Prabhu, D.I.G. et al. Characterization of tasar silkworm Antheraea mylitta drury (Saturniidae: Lepidoptera) midgut bacterial symbionts through metagenomic analysis. Int J Trop Insect Sci 43, 999–1011 (2023). https://doi.org/10.1007/s42690-023-01006-6
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DOI: https://doi.org/10.1007/s42690-023-01006-6