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Scientia Silvae Sinicae ›› 2023, Vol. 59 ›› Issue (4): 117-131.doi: 10.11707/j.1001-7488.LYKX20210919

• Research papers • Previous Articles     Next Articles

Differences in Bacterial Diversity and Key Cellulose-Degrading Bacteria in the Intestinal Tract of Anoplophora glabripennis (Coleoptera: Cerambycidae)Larvae Feeding on Fraxinus pennsylvanica and Salix matsudana

Ruofeng Jia1(),Qi Gu1,Yiming Sun1,Pengfei Lu1,*,Shibo Ju2,Haili Qiao2   

  1. 1. Key Laboratory for Silviculture and Conservation of Ministry of Education, Beijing Forestry University Beijing 100083
    2. Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences and Peking Union Medical College Beijing 100193
  • Received:2021-12-23 Online:2023-04-25 Published:2023-07-05
  • Contact: Pengfei Lu E-mail:jrf456789@163.com

Abstract:

Objective: This study aims to explore the adaptive reasons of Anoplophora glabripennis larvae to Fraxinus pennsylvanica, a traditional resistant species, in terms of intestinal bacteria diversity. Method: The A. glabripennis larvae were fed withF. pennsylvanica and Salix matsudana, respectively , and the high-throughput sequencing technology was used to sequence 16S rDNA of the larvae intestinal bacteria, with which the molecular identification and diversity analysis of intestinal bacteria were conducted. Subsequently, through accumulation culture, 31 strains of cellulose-degrading bacteria were screened out from unfed larvae. The cellulose-degrading ability of each strain was determined by the transparent circle diameter (D)/colony diameter (D) as the standard, and the filter paper re-screening test was conducted on the four strains with the strongest cellulose-degrading ability. Result: The results showed that Phylum Firmicutes, Class Bacilli, Order Lactobacillales, Family Streptococcaceae and the genus Lactococcus were predominant in the larvae intestinal tract after being fed with F. pennsylvanica. Whereas Phylum Firmicutes, Class Bacillus, Order Lactobacillales, Family Enterococcaceae and the genus Enterococcuswere predominant in the larvae intestinal tract after being fed with S. matsudana. Phylum Proteobacteria, Class Gammaproteobacteria, Order Enterobacteriales, Family Enterobacteriaceae and the genus Raoultella were predominant in the both feedings. The most significant difference between the two groups was that the relative abundance of Family Streptococcaceae and genus Lactococcusin the larvae feeding on F. pennsylvanica was significantly higher than that in the larvae feeding on S. matsudana , while the relative abundance of Family Enterococcaceae and genus Enterococcus was significantly lower than that in the larvae feeding onS. matsudana. In the intestinal bacterial community of larvae feeding directly on the branch of F. pennsylvanica, there were abundant species of cellulose-degrading bacteria, belonging to 4 phyla, 5 classes, 5 orders, 7 families, 7 genera and 15 species. At the genus level,Microbacterium, Cellulomonas and Pseudomonas were predominant. Among them, two strains ofPseudomonassp. and two strains of C. flavigena had the strongest cellulose-degrading ability. The filter paper was decomposed significantly in the re-screening test, which further verified that the strains had strong cellulose-degrading ability. Conclusion: Family Streptococcaceae and genus Lactococcus are the predominant bacteria in the intestinal tract of A. glabripennis larvae feeding onF. pennsylvanica, which may play an important role but do not degrade cellulose directly. Genera Microbacterium and Cellulomonas in Phylum Actinobacteria and genus Pseudomonas in Phylum Proteobacteria are not the predominant group of bacteria, but they have strong cellulose degradation ability and may play a role in cellulose degradation. These bacteria co-exist in the intestinal tract of A. glabripennis and are involved in its adaptation process to the F. pennsylvanica.

Key words: 16S rDNA, Anoplophora glabripennis, Fraxinus pennsylvanica, Salix matsudana, intestinal bacteria, cellulose-degrading bacteria

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