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Diversity and functional characteristics of culturable bacterial endosymbionts from cassava whitefly biotype Asia II-5, Bemisia tabaci

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Abstract

Whitefly Bemisia tabaci, a carrier of cassava mosaic disease (CMD), poses a significant threat to cassava crops. Investigating culturable bacteria and their impact on whiteflies is crucial due to their vital role in whitefly fitness and survival. The whitefly biotype associated with cassava and transmitting CMD in India has been identified as Asia II 5 through partial mitochondrial cytochrome oxidase I gene sequencing. In this study, bacteria associated with adult B. tabaci feeding on cassava were extracted using seven different media. Nutrient Agar (NA), Soyabean Casein Digest Medium (SCDM), Luria Bertani agar (LBA), and Reasoner’s 2A agar (R2A) media resulted in 19, 6, 4, and 4 isolates, respectively, producing a total of 33 distinct bacterial isolates. Species identification through 16SrRNA gene sequencing revealed that all isolates belonged to the Bacillota and Pseudomonadota phyla, encompassing 11 genera: Bacillus, Cytobacillus, Exiguobacterium, Terribacillus, Brevibacillus, Enterococcus, Staphylococcus, Brucella, Novosphingobium, Lysobacter, and Pseudomonas. All bacterial isolates were tested for chitinase, protease, siderophore activity, and antibiotic sensitivity. Nine isolates exhibited chitinase activity, 28 showed protease activity, and 23 displayed siderophore activity. Most isolates were sensitive to antibiotics such as Vancomycin, Streptomycin, Erythromycin, Kanamycin, Doxycycline, Tetracycline, and Ciprofloxacin, while they demonstrated resistance to Bacitracin and Colistin. Understanding the culturable bacteria associated with cassava whitefly and their functional significance could contribute to developing effective cassava whitefly and CMD control in agriculture.

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Acknowledgements

KV acknowledges the Department of Biotechnology, Government of India, New Delhi, India, for the Junior Research Fellowship (DBT-JRF) financial support during the doctoral program under grant DBT/2021-22/TNAU/1691. The Department of Agricultural Entomology, Tamil Nadu Agricultural University, Coimbatore, Tamil Nadu, India, is acknowledged for providing research facilities and funding. All authors accepted the final version of manuscript submitted to the journal.

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KV conducted all the laboratory experiments and manuscript drafting. SJ and MM conceived the hypothesis, designed the experiment, and corrected the manuscript. SM, RV, GK, and AM assisted in laboratory experiments and drafted the manuscript. All authors have seen and approved the manuscript and its contents, and that they are aware of the responsibilities connected to the authorship.

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Correspondence to Jeyarani Subramanian.

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The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper. On behalf of all authors, the corresponding author states that there is no conflict of interest.

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All authors declare that this work did not involve the use of humans or animals, and that they all approved the final manuscript before it was submitted to the journal.

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Kumar, V., Subramanian, J., Marimuthu, M. et al. Diversity and functional characteristics of culturable bacterial endosymbionts from cassava whitefly biotype Asia II-5, Bemisia tabaci. 3 Biotech 14, 100 (2024). https://doi.org/10.1007/s13205-024-03949-0

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