Antagonistic Activity of Fungal Strains against Fusarium Crown Rot

被引:13
作者
Zhao, Xingli [1 ]
Hou, Dianyun [1 ]
Xu, Jiaqi [1 ]
Wang, Kaixuan [1 ]
Hu, Zhenjie [2 ]
机构
[1] Henan Univ Sci & Technol, Coll Agr, Luoyang 471000, Peoples R China
[2] Henan Univ Sci & Technol, Coll Hort & Plant Protect, Luoyang 471000, Peoples R China
来源
PLANTS-BASEL | 2022年 / 11卷 / 03期
关键词
antagonistic activity; identification; Fusarium crown rot; biocontrol gene; ANTIMICROBIAL ACTIVITY; TALAROMYCES-TRACHYSPERMUS; ANTIFUNGAL ACTIVITY; ENDOPHYTIC FUNGI; MEDICINAL-PLANTS; DIVERSITY; WHEAT; PSEUDOGRAMINEARUM; PKS; ACTINOBACTERIA;
D O I
10.3390/plants11030255
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
The crown rot of wheat is a destructive soil-borne pathogen that severely reduces the yield and quality of wheat. This study aimed to screen and identify the antagonistic strains against Fusarium pseudograminearum (Fp), which is the dominant pathogen associated with the crown rot of wheat in China, and evaluate their biosynthetic potential. The antagonistic strains were screened via a dual-culture antagonism assay, and then identified by combining the morphological characteristics and internal transcribed spacer gene sequencing. The polyketide synthases (PKS-I and PKS-II) and non-ribosomal peptide synthetase (NRPS) genes in the antagonistic strains were detected via specific amplification of chromosomal DNA. Eleven out of 157 fungal strains, including six strains with matrix competition and five strains with antibiosis, were obtained. The eleven antagonistic strains belonged to the following four genera: Alternaria, Botryosphaeria, Phoma and Talaromyces. The inhibition rate of six strains with matrix competition was greater than 50%, with B. dothidea S2-22 demonstrating the highest at 80.3%. The width of the inhibition zone of T. trachyspermus R-17 among the five strains with antibiosis was the widest at 11 mm. Among the eleven antagonistic strains, three strains of A. alternata and the strain P. moricola only contained the PKS-II gene, the strain A. tenuissima contained PKS-I and PKS-II genes, three strains of B. dothidea contained PKS-II and NRPS genes, while three strains of T. trachyspermus did not contain any genes. These results demonstrated potential strains for the biocontrol of the crown rot of wheat. In particular, T. trachyspermus R-17 can be investigated further as a promising agent, and the active substances secreted by antagonistic strains may be synthesized by other pathways.
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页数:11
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