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Scientia Silvae Sinicae ›› 2025, Vol. 61 ›› Issue (2): 152-162.doi: 10.11707/j.1001-7488.LYKX20240014

• Research papers • Previous Articles     Next Articles

Phylogenesis of Metarhizium Strains and Their Screening for Biocontrol of Monochamus alternatus Adults (Coleoptera: Cerambycidae)

Chenglin Liu1(),Yue Ying1,2,Ruizhen Wang3,Yunpeng Liu1,Qinghua Wang1,Dezhi Kong1,Liangjian Qu1,*()   

  1. 1. Key Laboratory of Forest Protection of National Forestry and Grassland Administration Ecology and Nature Conservation Institute,Chinese Academy of Forestry Beijing 100091
    2. Research Institute of Subtropical Forestry,Chinese Academy of Forestry Hangzhou 311400
    3. Beijing Floriculture Engineering Technology Research Centre China National Botanical Garden (North Garden) Beijing 100093
  • Received:2024-01-07 Online:2025-02-25 Published:2025-03-03
  • Contact: Liangjian Qu E-mail:18821702618@163.com;qulj2001@caf.ac.cn

Abstract:

Objective: The phylogenetic relationship of 80 Metarhizium strains isolated from domestic and abroad and their virulence to Monochamus alternatus adult were investigated in order to screen highly virulent strains for the control of M. alternatus adult. Method: The ITS1/ITS4 and T1/T22 primer pairs were used to amplify the ITS region and β-tubulin gene sequences of 80 Metarhizium strains, respectively. MAFFT was used to align the sequences, and the phylogenetic tree was constructed using the maximum likelihood method and the Bayesian method with IQ-TREE and Mrbayes 3.2.7 software. The virulence of Metarhizium strains was determined using M. alternatus adults in 1-3 days after emergence. Metarhizium strains were cultured on PDA medium, and the spores were collected and prepared into a spore suspension with a concentration of 107·mL?1 using 0.05% Tween 80 solution, and 0.05% Tween 80 solution was used as a blank control. The impregnation method was used to treat M. alternatus adults, and the pathogenicity of the strains was evaluated by using the cumulative corrected mortality rate of M. alternatus adults. Result: Among the 123 strains collected from domestic and international libraries, there are 80 strains of Metarhizium, which are divided into 6 major taxa, including 57 strains belonging to M. anisopliae species complex, 11 strains belonging to M. flavoviride species complex, 6 strains belonging to M. rileyi, 4 strains belonging to M. viride, one strain belonging to M. cylindrosporum, and one strain belonging to M. novozealandicum. The highly virulent strains were mainly found in M. anisopliae species complex and M. flavoviride species complex. M. acridum, M. cylindrosporum, M. novozealandicum, M. rileyi, and M. viride did not show pathogenicity against M. alternatus adults. A total of 14 strains of Metarhizium were highly virulence (LT50< 15 d, 15-day adjusted mortality >80%), which can be used as alternative strains for the control of M. alternatus. Conclusion: Based on the phylogenetic and virulence test results of 80 strains of Metarhizium from domestic and international, strains with high virulence against M. alternatus adult have been screened, among which 14 strains have high application potential. The phylogenetic relationships of Metarhizium are established, and the distribution of highly virulent strains against M. alternatus adult is confirmed.

Key words: Metarhizium, Monochamus alternatus, screening and identification of strains, biocontrol

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