Abstract
Insect development is disrupted by juvenile hormone (JH) and their mimics in several ways. Many of them have been thoroughly investigated and are already being used to manage pest insects with commercially available agents. This research aims to explore the potentials of juvenile hormone analogue fenoxycarb on morphological, histopathological, and biochemical changes in the ovary of Spodoptera mauritia. Newly emerged female pupae were treated topically with sublethal doses (LD10, LD25) of fenoxycarb to determine their effects on reproduction. The results reveal that this juvenile hormone analogue affects the normal development of the ovary tissue by reducing the number of oocytes and oogonia in the ovaries of S. mauritia. Fenoxycarb treated pupae showed a substantial decrease in the reclaimed adultoids ovaries development and reduction in length of ovarioles, area of basal oocytes and the total number of eggs laid. A microscopic examination exhibited reduced pulsating movements, tumour-like bulbous masses and the germarium region exhibited hypertrophy. Histological investigation of ovaries indicated a degeneration of ovarian follicle cells, deformed oocytes with deteriorated trophocytes, malformed egg chamber, vacuolated ooplasm and defective vitellogenesis in malformed adult female’s ovarioles. The effect of fenoxycarb could be correlated with quantitative depletion of proteins, lipids, and carbohydrates in gonads of the treated groups and there were no significant changes in sodium dodecyl sulphate(SDS)- protein pattern. This study forms baseline data suggesting that fenoxycarb respond considerably for the control of the lepidopteran pest of paddy (S. mauritia) effectively.
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Acknowledgements
We gratefully acknowledge the Department of Zoology, University of Calicut, Kerala, India, for supporting and providing the essential infrastructure facility needed for this study. Individual research funding provided as major research project DST-SERB, New Delhi (SB/FT/LS-402/2012) for the corresponding author is gratefully acknowledged. Thanks are also extended to the special assistance program (SAP) of the Department of Zoology, University of Calicut.
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The first author was funded by the University Grant Commission (UGC), New Delhi, in the form of Maulana Azad National Fellowship for 2015–16 F1-17.1/2015–16/MANF-2015–17-KER-51524 /(SA-III/Website).
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Banu, C.A., Praseeja, C. & Manogem, E. Evaluation of the histopathological and biochemical effects of fenoxycarb in the ovaries of Spodoptera mauritia (Lepidoptera: Noctuidae). Int J Trop Insect Sci 42, 2413–2424 (2022). https://doi.org/10.1007/s42690-022-00769-8
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DOI: https://doi.org/10.1007/s42690-022-00769-8