ACTA AGRICULTURAE BOREALI-SINICA ›› 2020, Vol. 35 ›› Issue (6): 172-179. doi: 10.7668/hbnxb.20191619

Special Issue: Wheat

• Resource and Environment·Plant Protection • Previous Articles     Next Articles

Identification of Antagonistic Endophytic Bacterium YB-144 Strain from Fusarium Head Blight Against and Its Effect on DON

ZHANG Liyong1,2, XIA Mingcong2, XU Wen2, WANG Qi3, ZHANG Jie2, SUN Runhong2, PAN Yamei2, CHEN Ruixue2, WU Kun1, YANG Lirong2   

  1. 1. College of Life Sciences, Henan Agricultural University, Zhengzhou 450002, China;
    2. Institute of Plant Protection Research, Henan Academy of Agricultural Sciences, Biological Pesticides Engineering Research Center of Henan Province, Zhengzhou 450002, China;
    3. College of Plant Protection, China Agricultural University, Beijing 100193, China
  • Received:2020-09-03 Published:2020-12-28

Abstract: In order to study the safe and effective biological control technology to control the growth of Fusarium graminearum and inhibition its of production, 256 strains of endophytic bacteria were isolated from surface sterilized spikes of wheat with scab symptoms by plant endophyte isolation technology. Of them,a strain of antagonistic endophytic bacteria YB-144, which could significantly inhibit the growth of Fusarium graminearum and decrease DON content, was screened through the plate confrontation and co culture experiments.Strain YB-144 was identified as Bacillus velezensis based on morphological characteristics, biochemical characteristics and 16S rDNA gene sequence analysis.The inhibitory band width of the strain YB-144 against Fusarium graminearum PH-1 was 13.6 mm. After 15 h of co-culture, the inhibition rate of spore germination was as high as 81.67%, and the content of DON decreased by 66.6%. The expression levels of DON synthetic genes including Tri5, Tri3 and Tri8 were down-regulated by 5.0, 1.6 and 1.2 times, respectively. In addition, strain YB-144 displayed the antagonist effects against other 9 different plant pathogens, such as Rhizoctoniasolani cerealis and Bipolaris sorokiniana et al. The above results demonstrated that strain YB-144 has good potentials of exploitation and utilization.

Key words: Fusarium head blight, Fusarium graminearum, Bacillus velezensis, DON, Endophytic bacteria

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Cite this article

ZHANG Liyong, XIA Mingcong, XU Wen, WANG Qi, ZHANG Jie, SUN Runhong, PAN Yamei, CHEN Ruixue, WU Kun, YANG Lirong. Identification of Antagonistic Endophytic Bacterium YB-144 Strain from Fusarium Head Blight Against and Its Effect on DON[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2020, 35(6): 172-179. doi: 10.7668/hbnxb.20191619.

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