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| 1 | Diversity and functional analysis of Chinese bumblebee gut microbiota reveal the metabolic niche and antibiotic resistance variation of Gilliamella显示文摘Bumblebees play an important role in maintaining the balance of natural and agricultural ecosystems,and the characteristic gut microbiota of bumblebees exhibit significant mutualistic functions.China has the highest diversity of bumblebees;however,gut microbiota of Chinese bumblebees have mostly been investigated through cultureindependent studies.Here,we analyzed the gut communities of bumblebees from Sichuan,Yunnan,and Shaanxi provinces in China through 16S ribosomal RNA amplicon sequencing and bacterial isolation.It revealed that the bumblebees examined in this study harbored two gut enterotypes as previously reported:one is dominated by Gilliamella and Snodgrassella,and the other is distinguished by prevalent environmental species.The gut compositions obviously varied among different individual bees.We then isolated 325 bacterial strains and the comparative genomic analysis of Gillianiella strains revealed that galactose and pectin digestion pathways were conserved in strains from bumblebees,while genes for the utilization of arabinose,mannose,xylose,and rhamnose were mostly lost.Only two strains from the Chinese bumblebees possess the multidrug-resistant gene emrB,which is phylogenetically closely related to that from the symbionts of soil entomopathogenic nematode.In contrast,tetracycline-resistant genes were uniquely present in three strains from the USA.Our results illustrate the prevalence of strain-level variations in the metabolic potentials and the distributions of antibiotic-resistant genes in Chinese bumblebee gut bacteria. | Zi-Jing Zhang Ming-Fei Huang Li-Fei Qiu Rui-Hao Song Zi-Xuan Zhang Yi-Wen Ding Xin Zhou Xue Zhang Hao Zheng | 2021 | Insect Science2021，28，2： | 3 |
| 2 | Microbiota modulates gut immunity and promotes baculovirus infection in Helicoverpa armigera显示文摘Baculoviruses are natural enemies of agricultural and forest insect pests and play an important role in biological pest control.Oral infection by baculovirus in the insect midgut is necessary for establishing systemic infection and eventually killing the insect.Since the insect midgut continuously encounters microbiota,the gut microbiota could affect baculovirus infection.Here,we demonstrated that gut microbiota modulates immune responses and promotes baculovirus infection in the cotton bollworm,Helicoverpa armigera.After oral infection,numerous host immunity-related genes including genes encoding Toll and immune deficiency(IMD)pathway components were upregulated in the midgut.Elimination of the gut microbiota significantly increased the resistance to viral infection in H.armigera.Quantitative real-time reverse transcription polymerase chain reaction and proteomic analysis showed that downregulation of the antiviral factor prophenoloxidase(PPO)could be mediated by microbiota during infection.It implied that midgut microbiota diminishes the expression of PPO to facilitate viral infection in H.armigera.Our findings revealed that the microbiota plays an important role in modulating the resistance of H.armigera to baculovirus infection,providing new insights in applying biopesticide. | Chuanfei Yuan Longsheng Xing Manli Wang Zhihong Hu Zhen Zou | 2021 | Insect Science2021，28，6： | 1 |
| 3 | 昆虫肠道微生物种类及其功能研究进展显示文摘病虫为害是影响农产品产量和品质的重要因素,生物防治技术具有环境安全、农产品质量安全、害虫不产生抗药性等优点,越来越受到人们重视。肠道微生物对天敌昆虫和害虫的繁殖和生长发育有着重要的影响,本文就昆虫肠道微生物的种类、多样性及功能方面的研究进行了总结,为深入理解害虫暴发成灾机制,以及探索高效害虫生物防治技术提供参考。 | 陆秋成 何恒果 蒲德强 | 2023 | 四川农业科技2023，，2： | 0 |
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