Abstract

We conducted a series of experiments to test insect embryo capability to survive and increase reproductive investment during early development after short exposure to essential oils. We used Callosobruchus maculatus as a model insect and eucalyptus leaf and flower essential oils. Both essential oils exhibited toxicity against C. maculatus embryos and adults.However, flower essential oil was more toxic. A fetus exposed to essential oils tried to make the best of a bad situation and compensate essential oils harmful effects in the later life stages. Insect progeny production guarantee resulted in a trade-off between reproduction and female longevity. The insect also could alter fitness and reproductive behavior including, mating latency reduction, copulation duration increase, and copulation success rate raise in adulthood. Flower essential oil-exposed embryos were more successful in increasing copulation duration, and leaf essential oil-exposed embryos achieved more copulation success and less mating latency. These consequences persisted until F1 generation that was not directly exposed to essential oil. However, the F2 generation could concur with the harmful effects of essential oils. C. maculatus embryo might use epigenetic mechanisms to guarantee progeny production. Reproductive behavior changes and the trade-off can be evolutionary mechanisms to save species from possible extinction in deleterious situations.

Highlights

  • We conducted a series of experiments to test insect embryo capability to survive and increase reproductive investment during early development after short exposure to essential oils

  • The results demonstrated that eucalyptus, both leaf and flower essential oils were toxic to C. maculatus and exhibited intense insecticidal activity

  • We demonstrated that leaf essential oil-exposed male embryos improved their reproductive behavior in adulthood and achieved more copulation success (70%) and less mating latency (85.9 s) compared to control (55% and 149.3 s) and flower essential oil group (45% and 120.8 s) (Fig. 5)

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Summary

Introduction

We conducted a series of experiments to test insect embryo capability to survive and increase reproductive investment during early development after short exposure to essential oils. We used Callosobruchus maculatus as a model insect and eucalyptus leaf and flower essential oils Both essential oils exhibited toxicity against C. maculatus embryos and adults. Flower essential oil-exposed embryos were more successful in increasing copulation duration, and leaf essential oil-exposed embryos achieved more copulation success and less mating latency. These consequences persisted until F1 generation that was not directly exposed to essential oil. Insects possess other evolutionary features worth studying, such as insect behavioral immunity against different environmental s­ tressors[3] Environmental stressors such as nutrient availability, toxin or pathogen exposure, can severely restrict the reproduction ability of an organism and cause parental attempts to fight against i­t4. Non-lethal consequences, remain under-documented[11]

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