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Zhou Y, Lu C, Chen Z, Ye S, Fang X, Zhang Z, Cai S, Zhang F, Liang G. Pathogenicity virulence of Beauveria spp. and biosafety of the BbMQ strain on adult ectoparasitic beetles, Dastarcus helophoroides Fairmaire (Coleoptera: Colydiidae). Front Vet Sci 2023; 10:1077473. [PMID: 37261112 PMCID: PMC10229101 DOI: 10.3389/fvets.2023.1077473] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2022] [Accepted: 03/31/2023] [Indexed: 06/02/2023] Open
Abstract
Introduction Beauveria spp. and Dastarcus helophoroides Fairmaire adults were simultaneously released to attack elder larvae or pupae of Monochamus alternatus in pine forests in China. However, little is known about the pathogenicity virulence and biosafety of Beauveria spp. on beneficial adults of D. helophoroides, and specific Beauveria bassiana (Bb) strains should be selected for synthetic release together with D. helophoroides. Methods A total of 17 strains of Beauveria spp. were collected, isolated, and purified, and then their mortality, cadaver rate, LT50, spore production, spore germination rate, and growth rate of D. helophoroide adults were calculated based on 0-20 days data after spore suspension and powder contact. Results and discussion The lethality rate of BbMQ, BbFD, and BbMH-03 strains to D. helophoroides exceeded 50%, and the cadaver rate reached 70.6%, among which the mortality rate (82.22%), cadaver rate (47.78%), spore production (1.32 × 109 spores/ml), spore germination rate (94.71%), colony dimension (49.15 mm2), and LT50 (10.62 d) of the BbMQ strain were significantly higher than those of other strains (P < 0.01), and the mortality of D. helophoroides adults increased significantly with increased spore suspension concentration, with the highest mortality reaching 92.22%. This strain was identified as Beauveria bassiana by morphological and molecular methods, while the BbWYS strain had a minimum lethality of only 5.56%, which was safer compared to other strains of adult D. helophoroide. Consequently, the biological characteristics and pathogenicity of different Beauveria bassiana strains varied significantly in their effects on D. helophoroide adults, and the safety of different strains should be assessed when they are released or sprayed to control multiple pests in the forest. The BbMQ strain should not be simultaneously sprayed with releasing D. helophoroide adults in the same forest, while the BbWYS strain can be used in concert with D. helophoroide to synergize their effect.
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Affiliation(s)
- Youjun Zhou
- Forestry College, Fujian Agriculture and Forestry University, Fuzhou, Fujian, China
| | - Ciding Lu
- Forestry College, Fujian Agriculture and Forestry University, Fuzhou, Fujian, China
| | - Zhenghao Chen
- Forestry College, Fujian Agriculture and Forestry University, Fuzhou, Fujian, China
| | - Shuting Ye
- Forestry College, Fujian Agriculture and Forestry University, Fuzhou, Fujian, China
| | - Xinyuan Fang
- Forestry College, Fujian Agriculture and Forestry University, Fuzhou, Fujian, China
| | - Zhuhe Zhang
- Forest Pest and Disease Control and Quarantine Station, Forestry Bureau of Fuzhou City, Fuzhou, Fujian, China
| | - Shouping Cai
- Fujian Academy of Forestry, Fuzhou, Fujian, China
| | - Feiping Zhang
- Forestry College, Fujian Agriculture and Forestry University, Fuzhou, Fujian, China
- Provincial Key Laboratory of Integrated Pest Management in Ecological Forests, Fujian Agriculture and Forestry University, Fuzhou, Fujian, China
| | - Guanghong Liang
- Forestry College, Fujian Agriculture and Forestry University, Fuzhou, Fujian, China
- Provincial Key Laboratory of Integrated Pest Management in Ecological Forests, Fujian Agriculture and Forestry University, Fuzhou, Fujian, China
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Guo Y, Lin Q, Chen L, Carballar-Lejarazú R, Zhang A, Shao E, Liang G, Hu X, Wang R, Xu L, Zhang F, Wu S. Characterization of bacterial communities associated with the pinewood nematode insect vector Monochamus alternatus Hope and the host tree Pinus massoniana. BMC Genomics 2020; 21:337. [PMID: 32357836 PMCID: PMC7195709 DOI: 10.1186/s12864-020-6718-6] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2019] [Accepted: 04/05/2020] [Indexed: 01/24/2023] Open
Abstract
Background Monochamus alternatus Hope is one of the insect vectors of pinewood nematode (Bursaphelenchus xylophilus), which causes the destructive pine wilt disease. The microorganisms within the ecosystem, comprising plants, their environment, and insect vectors, form complex networks. This study presents a systematic analysis of the bacterial microbiota in the M. alternatus midgut and its habitat niche. Methods Total DNA was extracted from 20 types of samples (with three replicates each) from M. alternatus and various tissues of healthy and infected P. massoniana (pines). 16S rDNA amplicon sequencing was conducted to determine the composition and diversity of the bacterial microbiota in each sample. Moreover, the relative abundances of bacteria in the midgut of M. alternatus larvae were verified by counting the colony-forming units. Results Pinewood nematode infection increased the microbial diversity in pines. Bradyrhizobium, Burkholderia, Dyella, Mycobacterium, and Mucilaginibacter were the dominant bacterial genera in the soil and infected pines. These results indicate that the bacterial community in infected pines may be associated with the soil microbiota. Interestingly, the abundance of the genus Gryllotalpicola was highest in the bark of infected pines. The genus Cellulomonas was not found in the midgut of M. alternatus, but it peaked in the phloem of infected pines, followed by the phloem of heathy pines. Moreover, the genus Serratia was not only present in the habitat niche, but it was also enriched in the M. alternatus midgut. The colony-forming unit assays showed that the relative abundance of Serratia sp. peaked in the midgut of instar II larvae (81%). Conclusions Overall, the results indicate that the bacterial microbiota in the soil and in infected pines are correlated. The Gryllotalpicola sp. and Cellulomonas sp. are potential microbial markers of pine wilt disease. Additionally, Serratia sp. could be an ideal agent for expressing insecticidal protein in the insect midgut by genetic engineering, which represents a new use of microbes to control M. alternatus.
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Affiliation(s)
- Yajie Guo
- College of Forestry, Fujian Agriculture and Forestry University, Fuzhou, 350000, China.,Key Laboratory of Integrated Pest Management in Ecological Forests, Fujian Province University, Fujian Agriculture and Forestry University, Fuzhou, 350000, China.,State Key Laboratory of Ecological Pest Control for Fujian and Taiwan Crops, Fujian Agriculture and Forestry University, Fuzhou, 350000, China
| | - Qiannan Lin
- College of Forestry, Fujian Agriculture and Forestry University, Fuzhou, 350000, China.,Key Laboratory of Integrated Pest Management in Ecological Forests, Fujian Province University, Fujian Agriculture and Forestry University, Fuzhou, 350000, China
| | - Lyuyi Chen
- Universityof California, Irvine, CA, 92697-4025, USA
| | - Rebeca Carballar-Lejarazú
- Department of Microbiology & Molecular Genetics, University of California, Irvine, CA, 92697-4025, USA
| | - Aishan Zhang
- State Key Laboratory of Ecological Pest Control for Fujian and Taiwan Crops, Fujian Agriculture and Forestry University, Fuzhou, 350000, China
| | - Ensi Shao
- State Key Laboratory of Ecological Pest Control for Fujian and Taiwan Crops, Fujian Agriculture and Forestry University, Fuzhou, 350000, China
| | - Guanghong Liang
- College of Forestry, Fujian Agriculture and Forestry University, Fuzhou, 350000, China.,Key Laboratory of Integrated Pest Management in Ecological Forests, Fujian Province University, Fujian Agriculture and Forestry University, Fuzhou, 350000, China
| | - Xia Hu
- College of Forestry, Fujian Agriculture and Forestry University, Fuzhou, 350000, China.,Key Laboratory of Integrated Pest Management in Ecological Forests, Fujian Province University, Fujian Agriculture and Forestry University, Fuzhou, 350000, China
| | - Rong Wang
- College of Forestry, Fujian Agriculture and Forestry University, Fuzhou, 350000, China.,Key Laboratory of Integrated Pest Management in Ecological Forests, Fujian Province University, Fujian Agriculture and Forestry University, Fuzhou, 350000, China
| | - Lei Xu
- Graduate School of Chinese Academy of Agricultural Sciences, Beijing, 100081, China
| | - Feiping Zhang
- College of Forestry, Fujian Agriculture and Forestry University, Fuzhou, 350000, China. .,Key Laboratory of Integrated Pest Management in Ecological Forests, Fujian Province University, Fujian Agriculture and Forestry University, Fuzhou, 350000, China.
| | - Songqing Wu
- College of Forestry, Fujian Agriculture and Forestry University, Fuzhou, 350000, China. .,Key Laboratory of Integrated Pest Management in Ecological Forests, Fujian Province University, Fujian Agriculture and Forestry University, Fuzhou, 350000, China. .,State Key Laboratory of Ecological Pest Control for Fujian and Taiwan Crops, Fujian Agriculture and Forestry University, Fuzhou, 350000, China.
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