Abstract
Spodoptera litura (Fabricius) is a polyphagous pest causing economic losses to a number of agriculturally important crops. The present study aimed to investigate the changes in bacterial diversity during metamorphosis of insect using culturable techniques. Based on 16S rRNA sequencing, seventeen culturable bacteria were identified from different development stages of S. litura. Firmicutes were found to be the most abundant followed by Proteobacteria and Actinobacteria. The bacterial diversity varied across different developmental stages as indicated by Simpson and Shannon indices. The eggs supported less diverse bacterial flora consisting of Staphylococcus species. Further, different larval instars had a common baseline distribution of bacterial flora, with some bacterial species observed in specific instars only. The bacterial diversity decreased in the late pupal stage. The gut bacterial communities differed in male and female with Proteobacteria being more prominent in the later. Gut bacteria are known to play important role in host nutrition, digestion, detoxification, reproduction, communication etc. Therefore, in order to determine their functional role, S. litura larvae were fed on diet enriched with bacteria. None of the bacterial isolate influenced the fitness in terms of growth and development of S. litura. However, Serratia marcescens, Klebsiella pneumoniae and Pseudomonas paralactis lead to decrease the survival of S. litura. These results indicate that metamorphosis influences the gut bacterial diversity and the association between S. litura and its gut bacteria may be commensal or pathogenic. The study on culturable bacterial flora may pave the way to develop sustainable and environment friendly pest management approaches.
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All data generated or used during the study appeared in the submitted manuscript.
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Financial assistance received from University Grants Commission (UGC), Government of India, New Delhi, is duly acknowledged.
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University Grants Commission (UGC), Government of India, New Delhi (Grant number 484).
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Sanehdeep Kaur* and Harvinder Singh Saini conceived and designed the experiments. Sarita Devi performed the experiments, maintained the insect culture, analyzed the data and prepared the manuscript with the help of Sanehdeep Kaur*, Harvinder Singh Saini, Sunaina Sarkhandia and Rohit Mahajan.
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Devi, S., Sarkhandia, S., Mahajan, R. et al. Culturable bacteria associated with different developmental stages of Spodoptera litura (Fabricius) and their functional role. Int J Trop Insect Sci 42, 2995–3008 (2022). https://doi.org/10.1007/s42690-022-00832-4
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DOI: https://doi.org/10.1007/s42690-022-00832-4