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Beneficial efficacy and mode of action of probiotic Bacillus subtilis SWL-19 on the silkworm (Bombyx mori L.)

文献类型： 外文期刊

作者： Li, Guannan 1 ; Xiao, Yi 1 ; Leng, Jia 1 ; Lou, Qinian 2 ; Zhao, Tianfu 1 ;

作者机构： 1.Southwest Univ, Coll Sericulture Text & Biomass, State Key Lab Resource Insects, 2 Tiansheng Rd, Chongqing 400715, Peoples R China

2.Shandong Acad Agr Sci, Shandong Inst Sericulture, Yantai 264002, Shandong, Peoples R China

关键词： Probiotic B. subtilis SWL-19; Antioxidant property; Intestinal immunity; Vitamin B metabolism; Feed additive

期刊名称：SYMBIOSIS （ 影响因子：2.5； 五年影响因子：2.9 ）

ISSN： 0334-5114

年卷期： 2024 年 93 卷 1 期

页码：

收录情况： SCI

摘要： The safety and efficacy of probiotic Bacillus subtilis to raising animals in the livestock and poultry have been widely evaluated. Silkworm (Bombyx mori L.) is a well-known economic rearing insect, and its artificial diet rearing is gaining interest. However, the effects of probiotic B. subtilis as feed additive on silkworms fed with an artificial diet remain unknown. In this study, we adopted multiple biological approaches (enzyme activity assay, quantitative PCR, transcriptome sequencing, and LC-MS) to explore the beneficial effects of B. subtilis SWL-19 on silkworm physiology. Results showed that the body weights of the silkworms significantly increased (P < 0.05) after feeding with SWL-19 strain. B. subtilis SWL-19 evidently enhanced the antioxidant property in the silkworms, and the gene expression levels of antimicrobial peptides (attacin, lysozyme, and cecropins) were affected by the SWL-19 strain. Moreover, the levels of riboflavin, nicotinamide, pyridoxine, and pyridoxal in the hemolymph of the silkworms remarkably increased after SWL-19 strain feeding. The results of transcriptomic analysis indicated that the response of intestinal tissues to B. subtilis SWL-19 focused mainly on the categories of external biotic stimulus, interspecies interaction between organisms, immune system process, and stress response. In conclusion, probiotic B. subtilis SWL-19 substantially enhanced the body weight and antioxidant property of silkworm and simultaneously regulated the intestinal immunity and promoted the metabolism of B vitamins. The present study provides a theoretical reference for the application of probiotic B. subtilis SWL-19 to improve silkworm physiology under artificial diet rearing condition.

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