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The ecdysis triggering hormone system is essential for reproductive success in Mythimna separata (Walker). | LitMetric

The ecdysis triggering hormone system is essential for reproductive success in Mythimna separata (Walker).

Insect Mol Biol

State Key Laboratory of Crop Stress Biology in Arid Areas, College of Plant Protection, Northwest A&F University, Yangling, Shaanxi, People's Republic of China.

Published: April 2023

AI Article Synopsis

  • Ecdysis triggering hormone (ETH) helps insects like moths molt and may also play a role in reproduction, but we need to learn more about it.
  • Researchers studied a type of moth called Mythimna separata to see how ETH affects egg-laying in females compared to males.
  • They found that ETH is important for female moths to mature and lay eggs, and by interfering with this hormone, they could potentially control pest populations in the future.

Article Abstract

Ecdysis triggering hormone (ETH) was originally discovered as a key hormone that regulates insect moulting via binding to its receptor, ETH receptor (ETHR). However, the precise role of ETH in moth reproduction remains to be explored in detail. ETH function was verified in vivo using Mythimna separata (Walker), an important cereal crop pest. RT-qPCR analysis revealed that transcriptional expression profiles of MsepETH showed evident sexual dimorphism in the adult stage. MsepETH expression increased in the females on day 3 and persisted thereafter till day 7, consistent with female ovarian maturation, and was merely detectable in males. Meanwhile, MsepETH expression levels were significantly higher in the trachea than in other tissues. MsepETHR-A and MsepETHR-B were expressed in both sexes and were significantly higher in the antennae than in other tissues. MsepETH and MsepETHR knockdown in females by RNA interference significantly reduced the expression of MsepETH, MsepETHR-A, MsepETHR-B, MsepJHAMT, and MsepVG, which delayed egg-laying and significantly reduced egg production. RNAi 20-hydroxyecdysone (20E) receptor (EcR) decreased MsepETH expression whereas injecting 20E restored egg production that had been disrupted by MsepETH interference. Meanwhile, RNAi juvenile hormone (JH) methoprene tolerant protein (Met) also decreased MsepETH expression and smearing JH analog methoprene (Meth) restored egg production. In conclusion, the reproduction roles of ETH, JH, and 20E were investigated in M. separata. These findings will lay the foundation for future research to develop an antagonist that reduces female reproduction and control strategies for pest insects.

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Source
http://dx.doi.org/10.1111/imb.12825DOI Listing

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