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Lufenuron indirectly downregulates Vitellogenin in the boll weevil females reducing egg viability

2020; Wiley; Volume: 46; Issue: 1 Linguagem: Inglês

10.1111/phen.12337

1365-3032

Glaucilane dos Santos Cruz, Valéria Wanderley Teixeira, José Dijair Antonino, Gabriel Gazzoni Araújo Gonçalves, Hilton Nobre da Costa, Murilo David Ferreira, Clovis Lapa Neto, Luiz Carlos Alves, Fábio André Brayner dos Santos, Álvaro Aguiar Coelho Teixeira,

Insect-Plant Interactions and Control

Abstract Lufenuron, a molecule that belongs to the chitin synthesis inhibitors group of insect growth regulators, has a still unclear mode of action, but probably it affects chitin synthesis at a post‐transcriptional level. In this work, we report the effects of lufenuron on nutrition and reproduction in adult females of Anthonomus grandis , the main neotropical cotton pest and tried to link the effects on peritrophic matrix (PM) with egg viability. After Lufenuron treatment A. grandis females presented weight loss and less accumulation of protein and lipids probably due to PM breakdown. Also, treated females produce the same quantity of eggs as the control, although eggs from lufenuron‐treated females were less viable. After morphological and histochemical analysis, we have noticed that oocytes from lufenuron‐treated females contained less protein. Finally, lufenuron‐treated females produced at least nine times less vitellogenin (AgraVg) RNA than control females. We specifically showed that lufenuron treatment caused PM disruption and it has probably led to vitellogenin (AgraVg) downregulation in females culminating in egg unviability. The effect of lufenuron on PM leads to insect malnutrition, and this malnutrition downregulates vitellogenin among other genes. This is the first work that describes and tries to correlate the lufenuron effects on adult females.