文献类型: 外文期刊
作者: Liu, Xin-Ping 1 ; Fu, Kai-Yun 1 ; Lu, Feng-Gong 1 ; Meng, Qing-Wei 1 ; Guo, Wen-Chao 2 ; Li, Guo-Qing 1 ;
作者机构: 1.Nanjing Agr Univ, Coll Plant Protect, Key Lab Integrated Management Crop Dis & Pests, Educ Minist, Nanjing 210095, Jiangsu, Peoples R China
2.Xinjiang Acad Agr Sci, Dept Plant Protect, Urumqi 830091, Peoples R China
关键词: Leptinotarsa decemlineata;FTZ-F1;20-Hydroxyecdysone;Juvenile hormone;Pupation
期刊名称:INSECT BIOCHEMISTRY AND MOLECULAR BIOLOGY ( 影响因子:4.714; 五年影响因子:4.953 )
ISSN:
年卷期:
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收录情况: SCI
摘要: During the final instar larvae of holometabolous insects, a pulse of 20-hydroxyecdysone (20E) and a drop in juvenile hormone (JH) trigger larval-pupal metamorphosis. In this study, two LdFTZ-F1 cDNAs (LdFTZ-F1-1 and LdFTZ-F1-2) were cloned in Leptinotarsa decemlineata. Both LdFTZ-F1-1 and LdFTZ-F1-2 were highly expressed just before or right after each molt, similar to the expression pattern of an ecdysteroidogenesis gene LdSHD. Ingestion of an ecdysteroid agonist halofenozide (Hal) enhanced LdFTZ-F1-1 and LdFTZ-F1-2 expression in the final larval instar. Conversely, a decrease in 20E by feeding a double-stranded RNA (dsRNA) against LdSHD repressed the expression. Moreover, Hal rescued the expression levels in LdSHD-silenced larvae. Thus, 20E peaks seem to induce the transcription of LdFTZ-F1s. Furthermore, ingesting dsLdFTZ-F1 from a common fragment of LdFTZ-F1-1 and LdFTZ-F1-2 successfully knocked down both LdFTZ-F1s, and impaired pupation. Finally, knocking down LdFTZ-F1s significantly repressed the transcription of three ecdysteroidogenesis genes, lowered 20E titer, and reduced the expression of two 20E receptor genes. Silencing LdFTZ-F1s also induced the expression of a JH biosynthesis gene, increased JH titer, but decreased the mRNA level of a JH early-inducible gene. Thus, LdFTZ-F1s are involved in the regulation of pupation by modulating 20E and JH titers and mediating their signaling pathways. (C) 2014 Elsevier Ltd. All rights reserved.
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