Knockdown of farnesyl pyrophosphate synthetase gene TuFPPS by RNAi extends quiescent period and halts molting of the spider mite, Tetranychus urticae.

IF 1.8 2区 农林科学 Q2 ENTOMOLOGY
Qingyan Li, Qixiang Peng, Zhuo Li, Guy Smagghe, Gang Li
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Abstract

In insects, farnesyl pyrophosphate synthase (FPPS), a pivotal enzyme in the mevalonate pathway, is crucial in the juvenile hormone (JH)/methyl farnesoate (MF) biosynthesis pathway, particularly regulating the molting process. However, its role in the post-embryonic development and molting in Acari remains unclear. This study therefore investigated the function of TuFPPS in the deutonymphal stage of the two-spotted spider mite, Tetranychus urticae, an important pest in agriculture. Real time quantitative PCR (qPCR) revealed a significant increase in TuFPPS expression in the middle of the quiescent period (28 h). RNA interference (RNAi)-mediated knockdown of TuFPPS caused developmental delays, notably extending the quiescent period and delaying the molting process. Ultimately, the treated mites failed to molt and died with 80% mortality at 108 h before molting, while > 90% of the mites in the control successfully molted. To investigate the potential functions of TuFPPS during the quiescent period and molting process in T. urticae, we performed a genome-wide RNA sequencing following RNAi knockdown of TuFPPS. Four genes were identified based on the thresholds of|FC| ≥ 3 and FDR < 0.05, and these are involved in carbohydrate metabolism, fatty acid and lipid metabolism, amino acid metabolism, and ABC transporters. Altogether, our data suggest that TuFPPS plays a critical role in regulating energy transport, intracellular digestion, and energy supply, as seen in ametabolous insects. These findings lay the foundation for further studies of the molecular mechanism of JH/MF in post-embryonic development and molting in mites, and also identify a potential target for pest control, as demonstrated in T. urticae.

用RNAi敲低法尼基焦磷酸盐合成酶基因TuFPPS,延长了荨叶螨的静止期,阻止了其蜕皮。
在昆虫中,法尼酯焦磷酸盐合成酶(FPPS)是甲羟戊酸途径中的关键酶,在幼体激素(JH)/法尼酯甲酯(MF)生物合成途径中起着至关重要的作用,特别是调节着蜕皮过程。然而,其在蜱螨胚胎后发育和蜕皮中的作用尚不清楚。因此,本研究考察了TuFPPS在农业重要害虫荨叶螨(Tetranychus urticae)双斑蛛螨(two-spot spider mite)双羽期的功能。实时荧光定量PCR (Real - time quantitative PCR, qPCR)结果显示,TuFPPS在静息期中期(28h)表达显著增加。RNA干扰(RNAi)介导的TuFPPS基因敲低会导致发育迟缓,尤其是静止期延长和蜕皮过程延迟。最终,处理组螨未脱皮,在脱皮前108 h死亡,死亡率为80%,而对照组螨脱皮成功率为90%。为了研究TuFPPS在T. urticae的静止期和蜕皮过程中的潜在功能,我们在RNAi敲除TuFPPS后进行了全基因组RNA测序。根据|FC|≥3和FDR阈值鉴定出4个基因
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来源期刊
CiteScore
3.90
自引率
9.10%
发文量
81
审稿时长
4-8 weeks
期刊介绍: Experimental and Applied Acarology publishes peer-reviewed original papers describing advances in basic and applied research on mites and ticks. Coverage encompasses all Acari, including those of environmental, agricultural, medical and veterinary importance, and all the ways in which they interact with other organisms (plants, arthropods and other animals). The subject matter draws upon a wide variety of disciplines, including evolutionary biology, ecology, epidemiology, physiology, biochemistry, toxicology, immunology, genetics, molecular biology and pest management sciences.
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