Insights into the effect on silkworm (Bombyx mori) cocooning and its potential mechanisms following non-lethal dose tebuconazole exposure

被引:19
作者
Li, Shuying [1 ]
Jiang, Hongbing [1 ]
Qiao, Kun [1 ]
Gui, Wenjun [1 ]
Zhu, Guonian [1 ]
机构
[1] Zhejiang Univ, Inst Pesticide & Environm Toxicol, Hangzhou 310058, Zhejiang, Peoples R China
基金
中国博士后科学基金; 中国国家自然科学基金;
关键词
Bombyx mori; Tebuconazole; Chronic toxicity; Ecdysteroid; Juvenile hormone; Gene expression; ACETYLCHOLINESTERASE GENES; JUVENILE-HORMONES; INSECT; GLAND; BIOSYNTHESIS; FORMULATION; FABRICATION; PATHWAY; FIBROIN; MIDGUT;
D O I
10.1016/j.chemosphere.2019.06.105
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Silkworm (Bombyx mori) is one of the most important economic insects in the world, while pesticides impact its economic benefits. Tebuconazole is a fungicide that has been frequently detected in agriculture systems at concentrations that affect endocrine function in organisms. In the present study, silkworm larvae at different instar stages were exposed to tebuconazole, respectively. Cocoon weight, cocoon shell weight and cocoon shell rate were significantly decreased by 6.8%, 11.8% and 4.4% respectively, after exposure to 0.40 mg/L tebuconazole at 2nd-3rd instar stage. Vacuolization was found in the exposure silkworm under histopathological study at all stages exposures, indicating potential damage to silk gland. Downregulation of genes transcription (Fibh, Fibl, P25, Ser2, Ser3) involved with protein synthesis in the silk gland were further observed, and the results showed significant decreasing in mRNA expression among the tebuconazole treatments. Ecdysteroid levels in silkworm were changed with pronounced decreases after exposed to tebuconazole. In contrast, exposure to tebuconazole significantly increased juvenile hormone 1 concentrations and the maximum increasing fold of juvenile hormone 1 was up to 3.73 which was observed at stage I exposure. In addition, co-exposure to 2 and 10 mg/L forskolin able to mitigate tebuconazole-induced downregulate of mRNA expression of Sgf1 in the present study, indicating the potential mechanism of tebuconazole-induced chronic toxicity in silkworm may relative to PI3K/AKT/TORCI/Sgfl pathway. (C) 2019 Elsevier Ltd. All rights reserved.
引用
收藏
页码:338 / 345
页数:8
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