biostudies-literatureUnknown13Huang YApple (<i>Malus domestica</i> Borkh.), one of the most economically important fruits widely consumed worldwide, has been suffering from apple ring rot caused by <i>Botryosphaeria dothidea</i>, which dramatically affects its quality and yield. In the present study, we demonstrated that <i>Pseudomonas protegens</i>, isolated from Chinese leek (<i>Allium tuberosum</i>), significantly suppressed the mycelial growth and propagation of <i>B. dothidea</i>, respectively, further displayed a considerably inhibitory effect on the apple ring rot of postharvest fruits. In addition, <i>P. protegens</i> significantly improved the total soluble solid/titrable acidity (TSS/TA) ratio and soluble sugar/titrable acidity (SS/TA) ratio and drastically maintained the fruit firmness. Further analysis manifested Frontiers in microbiology1069517https://www.ebi.ac.uk/biostudies/studies/S-EPMC9771998biostudies-literatureEndophytic bacterium <i>Pseudomonas protegens</i> suppresses mycelial growth of <i>Botryosphaeria dothidea</i> and decreases its pathogenicity to postharvest fruits.PMC9771998Liu JLi JShan XHuang YDuan YfalseEndophytic bacterium <i>Pseudomonas protegens</i> suppresses mycelial growth of <i>Botryosphaeria dothidea</i> and decreases its pathogenicity to postharvest fruits.Apple (<i>Malus domestica</i> Borkh.), one of the most economically important fruits widely consumed worldwide, has been suffering from apple ring rot caused by <i>Botryosphaeria dothidea</i>, which dramatically affects its quality and yield. In the present study, we demonstrated that <i>Pseudomonas protegens</i>, isolated from Chinese leek (<i>Allium tuberosum</i>), significantly suppressed the mycelial growth and propagation of <i>B. dothidea</i>, respectively, further displayed a considerably inhibitory effect on the apple ring rot of postharvest fruits. In addition, <i>P. protegens</i> significantly improved the total soluble solid/titrable acidity (TSS/TA) ratio and soluble sugar/titrable acidity (SS/TA) ratio and drastically maintained the fruit firmness. Further analysis manifested 2022-01-01T00:00:00Z20222025-04-04T19:47:36.02Z2025-02-19T03:00:16.184ZS-EPMC97719983656908510.3389/fmicb.2022.1069517