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Isolation and identification of two Beauveria bassiana strains from silkworm, Bombyx mori

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Abstract

Silkworm diseases caused by fungi infection occur frequently in sericulture and brought huge economic loss to sericulture. However, on the other hand, some fungi such as Beauveria bassiana, as an important entomological fungus, play an important role in biological control of insect pests. Here, two fungal pathogens causing yellow muscardine were isolated from the silkworm and named as SZY1 and SZY2. These two strains showed almost the same conidial morphology which were smooth, near-spherical, spherical, or ovoid and 2.7 ± 0.6 µm × 2.5 ± 0.9 µm in size, and the hyphal growth rate was also similar. However, the conidia production of SZY2 was almost twice as many as that of SZY1. The complete ribosomal RNA gene was sequenced and analyzed. As a result, the gene sequences of internal transcript space 1 (ITS1)-5.8S rRNA-internal transcript space 2 (ITS2) of SZY1 and SZY2 were identical in sequence and size, and for 18S rRNA, 28S rRNA, and intergenic spacer (IGS), the gene identity of SZY1 to SZY2 was 99%, 99%, and 98%, respectively. Results of phylogenetic analysis based on either ITS1-5.8S rRNA-ITS2 or 18S rRNA showed that both SZY1 and SZY2 were closely related to Beauveria bassiana. These results revealed that the pathogens of yellow muscardine SZY1 and SZY2 were identified as two different strains of Beauveria bassiana, which could provide diagnostic evidence for silkworm muscardine and was helpful for the research and development of novel Bombyx batryticatus and fungal biological insecticide.

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Funding

This work was supported by the earmarked fund for the China Agriculture Research System (CARS-18) and Natural Science Foundation of Jiangsu Province (Grant Number: BK20190244).

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  1. Yiling Zhang and Xu Yang contributed equally to this study.

Authors and Affiliations

  1. College of Biotechnology, Jiangsu University of Science and Technology, Zhenjiang, 212100, China

    Yiling Zhang, Xu Yang, Jiao Zhang, Mingzhen Ma, Ping He, Yu Li, Qiang Wang, Xudong Tang & Zhongyuan Shen

  2. The Sericultural Research Institute, Chinese Academy of Agricultural Sciences, Zhenjiang, 212100, China

    Yiling Zhang, Qiang Wang, Xudong Tang & Zhongyuan Shen

  3. Key Laboratory of Genetic Improvement of Silkworm and Mulberry of Agricultural Ministry, Zhenjiang, 212100, China

    Yiling Zhang, Qiang Wang, Xudong Tang & Zhongyuan Shen

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  1. Yiling Zhang
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Zhang, Y., Yang, X., Zhang, J. et al. Isolation and identification of two Beauveria bassiana strains from silkworm, Bombyx mori. Folia Microbiol 67, 891–898 (2022). https://doi.org/10.1007/s12223-022-00986-1

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