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• W4387629849 endingPage "105368" @default.
• W4387629849 startingPage "105368" @default.
• W4387629849 abstract "Rice sheath blight, caused by Rhizoctonia solani, is a major disease of rice that significantly affects rice production. To find sustainable and effective methods to control this disease, biocontrol strains have emerged as a promising solution. In this study, a total of 28 strains were screened from the rhizosphere of rice plants in order to identify strains that are effective against rice sheath blight. Among these strains, strain S17-377 showed remarkable antifungal activity, resulting in a 10 mm diameter inhibitory band against R. solani. Furthermore, it exhibited a wide range of antimicrobial properties in vitro. Through genetic analysis using the 16S rDNA and recA genes, strain S17-377 was identified as Burkholderia pyrrocinia. Importantly, it was found to be non-pathogenic to onions and did not possess the virulence genes BCESM and cblA. Therefore, this strain is safe for both people and plants. The strain S17-377 showed an efficacy of 64.81% and 55.78% in controlling rice sheath blight in pot experiments and field trials, respectively. Strain S17-377 displayed persistent colonization ability in rice plants for up to 30 days after inoculation. It also induced the expression of several rice plant genes, including NH1, PR1a, PR10, PAL/ZB8, LOX, and AOS2, as well as enzymes such as POD, PPO, and PAL. Additionally, S17-377 produced proteases, chitinases, non-volatile metabolites, and biofilms. In terms of disease control, the aseptic fermentation solution of S17-377, when diluted with PDA medium at ratios of 1:20, 1:10, and 1:5, exhibited inhibition rates of 77.14%, 86.92%, and 98.26%, respectively, against R. solani. S17-377 also had noticeable effects on the expansion and collapse of fungal mycelium. Moreover, the bacterial culture filtrates(BCF) of S17-377 demonstrated high thermal stability with an inhibition rate of 96.16%, even after being subjected to a temperature of 121 °C for 30 min. The BCF of strain S17-377 exhibited significant inhibition of R. solani, with inhibition rates of 95.23%, 94.43%, and 75.11% for the n-butanol, crude protein, and crude lipopeptide extracts, respectively. Further analysis of the n-butanol extract using liquid chromatography-mass spectrometry (LC-MS) identified eight compounds with potent antibacterial activity. These findings highlight the potential of strain S17-377 as a biocontrol agent for the management of rice sheath blight." @default.
• W4387629849 created "2023-10-14" @default.
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• W4387629849 date "2023-12-01" @default.
• W4387629849 modified "2023-10-15" @default.
• W4387629849 title "Biocontrol efficacy of Burkholderia pyrrocinia S17-377 in controlling rice sheath blight" @default.
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• W4387629849 doi "https://doi.org/10.1016/j.biocontrol.2023.105368" @default.
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