Eclosion hormone functions in larva-pupa-adult ecdysis in Leptinotarsa decemlineata

文献类型： 外文期刊

第一作者： Shen, Chen-Hui

作者： Shen, Chen-Hui;Jin, Lin;Li, Guo-Qing;Fu, Kai-Yun;Guo, Wen-Chao

作者机构：

关键词： Leptinotarsa decemlineata; Eclosion hormone; Ecdysis; Trachea clearance; Wing expansion

期刊名称：JOURNAL OF ASIA-PACIFIC ENTOMOLOGY （ 影响因子：1.101； 五年影响因子：1.1 ）

ISSN： 1226-8615

年卷期： 2021 年 24 卷 1 期

页码：

收录情况： SCI

摘要： In Drosophila melanogaster, ecdysis-triggering hormone (ETH) and eclosion hormone (EH) mutually enhance the release of each other through a positive feedback loop. Both are involved in the stimulation of ecdysis behavior series and molting-related physiological preparations. However, whether 20-hydroxyecdysone (20E) controls eh expression and whether EH plays a similar role in non-Drosophilid insects remain to be determined. In Leptinotarsa decemlineata, we found that Ldeh mRNA levels were high in the early and/or late stages and low in the intermediate period within each larval instar, indicating that the mRNA peaks positively correlate with 20E pulses. Consistent with the indication, we confirmed that 20E signaling stimulated the transcription of Ldeh. RNA interference (RNAi)-aided knockdown of Ldeh at the final instar stage slightly impaired pupation and significantly affected wing expansion. Around 20% of the Ldeh RNAi larvae remained as prepupae, completely wrapped in the old larval cuticles. These prepupae gradually darkened, dried and withered, and finally died. The remaining (about 80%) Ldeh hypomorphs became pupae and emerged as abnormal adults, bearing smaller and wrinkle elytra and hindwings. The adult tracheae in the Ldeh hypomorphs were full of liquid. In addition, the low pupation rate and high deformed adult proportion cannot be rescued by ingestion of either 20E or juvenile hormone. Thus, EH is critical for ecdysis and trachea clearance in L. decemlineata. The failure of trachea clearance may disenable air-swallowing during larva-pupa-adult transition and thus impacts wing growth and expansion.

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