Disturbance of Adult Eclosion by Fenoxycarb, a Juvenile Hormone Mimic, in the Beet Armyworm, Spodoptera exigua

Kim, Yonggyun; Kim, Dongki; Lee, Jungeon

doi:10.1016/s1226-8615(08)60063-1

Cited by 9 publications

(2 citation statements)

References 30 publications

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“…Most lepidopteran species in general use JH I and JH II [58]. Similar result for S. exigua has been obtained in our previous report showing that both JH I and JH II can inhibit metamorphosis of pupae when they are applied to young pupae whereas JH III cannot [59]. In comparison, the hemolymph of S. litura , a close taxonomical species to S. exigua , has only JH II [60].…”

Section: Discussionsupporting

confidence: 76%

Insulin signaling mediates previtellogenic development and enhances juvenile hormone-mediated vitellogenesis in a lepidopteran insect, Maruca vitrata

et al. 2019

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Background Insulin/insulin-like growth peptide signaling (IIS) down-regulates hemolymph sugar level and facilitates larval growth in the soybean pod borer, Maruca vitrata . The objective of this study is to determine whether IIS of M. vitrata can mediate ovarian development of adult females. Results A pair of ovaries consists of 8 ovarioles, each of which is separated into distal germarium and proximal vitellarium in M. vitrata . In the germarium, oocyte development occurred with active mitotic activity which was visible by incorporating bromodeoxyribose uridine. Previtellogenic development and subsequent vitellogenesis began soon after adult emergence. They continued with increase of female age. Oocyte development was facilitated by up-regulation of vitellogenin (Vg) and Vg receptor (VgR) gene expression. Larval diets significantly influenced on ovarian development of M. vitrata because oocyte development varied with pupal size derived from larvae treated with different nutritional diets. Its ovarian development was dependent on endocrine signal(s) from the head because decapitation soon after adult emergence prevented oogenesis and subsequent vitellogenesis along with marked reduction of Vg and VgR expression. Topical application of juvenile hormone (JH) significantly recovered its ovarian development whereas farnesoic acid (a precursor of JH biosynthesis) or 20-hydroxyecdysone treatment did not. JH stimulated vitellogenesis and choriogenesis, but not previtellogenic development. In contrast, insulin injection to decapitated females stimulated oocyte differentiation and vitellogenesis along with increase of Vg and VgR expression. To further analyze the effect of insulin on ovarian development, expression of four IIS components (InR, FOXO, Akt, and TOR) genes was manipulated by RNA interference. Hemocoelic injection of gene-specific double stranded RNAs significantly reduced their target gene mRNA levels and interfered with ovarian development. An addition of insulin to JH treatment against decapitated females enhanced the gonadotropic effect of JH by stimulating oogenesis. Conclusions IIS plays crucial role in mediating previtellogenic development of M. vitrata in response to nutrient signal. It also enhances the gonadotropic effect of JH II on vitellogenesis. Electronic supplementary material The online version of this article (10.1186/s12861-019-0194-8) contains supplementary material, which is available to authorized users.

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Section: Discussionsupporting

confidence: 76%

Insulin signaling mediates previtellogenic development and enhances juvenile hormone-mediated vitellogenesis in a lepidopteran insect, Maruca vitrata

et al. 2019

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“…The same treatment of pupae of Spodoptera exigua with JH I and JH II also resulted in a reduction in the eclosion rate, as well as the appearance of dysmorphic adults [37]. Our results revealed that JH I and JH II were present in extremely low titres in the early pupal…”

Section: Discussionsupporting

confidence: 58%

Interactions between 20-Hydroxyecdysone and Juvenile Hormone I, II, and III during the Developmental Stages of Spodoptera frugiperda

Li,

Liao,

Hou

et al. 2023

Agronomy

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Juvenile hormones (JHs) play a crucial role in the development of the fall armyworm, Spodoptera frugiperda, with varying types and concentrations observed at different stages. However, the interplay between JHs and 20-hydroxyecdysone (20E) in co-ordinating the life cycle of S. frugiperda remains unknown. In this study, by using high-precision UPLC-MS/MS and qRT-PCR, we detected changes in JH and 20E levels and identified important 20E receptor and response genes. Our findings revealed that JH I antagonises JH II, whereas JH II promotes JH III synthesis. High JH I and JH II concentrations in the larval stage strongly affected moulting to the next instar. Furthermore, these hormones inhibit 20E synthesis and reduce its receptor expression, thereby affecting 20E signalling. During pupation, JH II plays a crucial role in stimulating 20E synthesis for larval–pupal transformation. JH I and JH II are essential for eclosion, precisely controlling emergence timing and subsequent reproductive organ maturation. These hormones likely regulate larval development, pupation, and adult reproduction in S. frugiperda. Further studies are warranted to explore the regulatory advantages of JH I and JH II over JH III.

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The current state of knowledge on the neuroactive compounds that affect the development, mating and reproduction of spiders (Araneae) compared to insects

2017

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The neuroendocrine system of insects, including the presence of the main neuroactive compounds, and their role in ontogenesis are probably best understood of all the arthropods. Development, metamorphosis, the maturation of the gonads, vitellogenesis and egg production are regulated by hormones (juvenile hormones, ecdysteroids) and neuropeptides. However, knowledge about their presence and functions in spiders is fragmentary. In this paper, we present a summary of the current data about the juvenile hormones, ecdysteroids and neuropeptides in selected groups of arthropods, with particular emphasis on spiders. This is the first article that takes into account the occurrence, action and role of hormones and neuropeptides in spiders. In addition, the suggestions for possible ways to study these compounds in Araneomorphae spiders are unique and cannot be found in the arachnological literature.

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Disturbance of Adult Eclosion by Fenoxycarb, a Juvenile Hormone Mimic, in the Beet Armyworm, Spodoptera exigua

Cited by 9 publications

References 30 publications

Insulin signaling mediates previtellogenic development and enhances juvenile hormone-mediated vitellogenesis in a lepidopteran insect, Maruca vitrata

Insulin signaling mediates previtellogenic development and enhances juvenile hormone-mediated vitellogenesis in a lepidopteran insect, Maruca vitrata

Interactions between 20-Hydroxyecdysone and Juvenile Hormone I, II, and III during the Developmental Stages of Spodoptera frugiperda

The current state of knowledge on the neuroactive compounds that affect the development, mating and reproduction of spiders (Araneae) compared to insects

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