ISSN: 0973-7510

E-ISSN: 2581-690X

Research Article | Open Access
Benzhong Fu , Lei Yu, Bokai Wang and Cao Zheng
Hubei Key Laboratory of Quality Control of Characteristic Fruits and Vegetables, College of Life Science and Technology, Hubei Engineering University, Hubei Xiaogan 432000, China.
J Pure Appl Microbiol. 2021;15(3):1384-1392 | Article Number: 6979
https://doi.org/10.22207/JPAM.15.3.30 | © The Author(s). 2021
Received: 11/04/2021 | Accepted: 24/06/2021 | Published: 24/07/2021
Abstract

Walnut blight caused by Xanthomonas arboricola pv. juglandis (Xaj) is the most important bacterial disease in walnut production worldwide. To seek biocontrol agents against Xaj, we screened 152 endophytic bacteria isolated from 87 plants. Through dual-culture method screening, we obtained four antagonistic bacteria, ATE17, BME17, CIE17, and OFE17 which were isolated from Amaranthus tricolor, Bambusa multiplex, Canna indica, and Osmanthus fragrans plants respectively. The inhibition ratios of ATE18, BME17, CIE18, and OFE17 against Xaj on plates were 1.5, 1.6, 1.3, and 1.6, respectively. These indicated they have good biocontrol potential for walnut bacterial blight. Subsequently, the four endophytic bacteria were identified by morphology, Gram staining, Microbial Identification System (fatty acid methyl ester analysis), as well as 16S rDNA and gyrB sequencing. It turns out that all four strains were identified as Bacillus sp. Furthermore, the two strains BME17 and OFE17 can suppress multiple plant fungal pathogens and bacterial pathogens on plates.

Keywords

Antagonism, Bacillus sp., Bambusa multiplex, Biocontrol agent, Endophytic bacteria, Osmanthus fragrans

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