Biocontrol Mechanism of Bacillus subtilis C3 Against Bulb Rot Disease in Fritillaria taipaiensis P.Y.Li

Bulb rot disease has become one of the main diseases that seriously affects the yield and quality of P.Y.Li ( ). In this study, was used as the research object to explore the effect and mechanism of C3 in preventing and curing bulb rot. Through isolation and verification of the pathogenic fungi, we...

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Published inFrontiers in microbiology Vol. 12; p. 756329
Main Authors Ku, Yongli, Yang, Nan, Pu, Peng, Mei, Xueli, Cao, Le, Yang, Xiangna, Cao, Cuiling
Format Journal Article
LanguageEnglish
Published Switzerland Frontiers Media S.A 30.09.2021
Subjects
active ingredients
Bacillus subtilis
biological control
Fritillaria taipaiensis P.Y.Li
Fusarium
Microbiology
Fusarium
biological control
active ingredients
Bacillus subtilis
Fritillaria taipaiensis P.Y.Li
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Summary:Bulb rot disease has become one of the main diseases that seriously affects the yield and quality of P.Y.Li ( ). In this study, was used as the research object to explore the effect and mechanism of C3 in preventing and curing bulb rot. Through isolation and verification of the pathogenic fungi, we determined for the first time that the pathogenic fungus that causes bulb rot in is . The results of the study showed that C3 inhibits the growth of pathogenic fungi, and the inhibition rate is as high as 60%. In the inhibition mechanism, strain C3 inhibits the conidiogenesis of pathogenic fungi and destroys the cell structure of its hyphae, causing protoplast exudation, chromatin concentration, DNA fragmentation, and ultimately cell death. Among the secondary metabolites of C3, antimicrobial proteins and main active components (paeonol, ethyl palmitate, and oxalic acid) inhibited the growth of . The molecular weight of the antibacterial protein with the highest inhibition rate was approximately 50 kD. The results of a field experiment on the Taibai Mountain planting base showed that after the application of strain C3, the incidence of bulb rot in was reduced by 18.44%, and the ratio of bacteria to fungi in the soil increased to 8.21, which verified the control effect of C3 on bulb rot disease. This study provides a theoretical basis for the use of C3 to prevent and control bulb rot in .
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These authors have contributed equally to this work and share first authorship
Edited by: Tofazzal Islam, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Bangladesh
Reviewed by: Manik Prabhu Narsing Rao, Sun Yat-sen University, China; Florin Oancea, National Institute for Research & Development in Chemistry and Petrochemistry (ICECHIM), Romania; Md. Samiul Islam, Huazhong Agricultural University, China; Qiang Li, Institute of Karst Geology, Chinese Academy of Geological Sciences, China
This article was submitted to Microbe and Virus Interactions with Plants, a section of the journal Frontiers in Microbiology
ISSN:1664-302X
1664-302X
DOI:10.3389/fmicb.2021.756329