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首页> 外文期刊>Food microbiology >Biofilm production by Aureobasidium pullulans improves biocontrol against sour rot in citrus
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Biofilm production by Aureobasidium pullulans improves biocontrol against sour rot in citrus

机译：金黄色葡萄球菌产生的生物膜改善了对柑橘酸腐的生物防治

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摘要

The biocontrol efficiency of Aureobasidium pullulans strain ACBL-77 against Geotrichum citri-aurantii, causal agent of sour rot in citrus, and their interactions were evaluated. For this, were evaluated the incorporation of nutrients in optimizing the antagonistic activity of the yeast, the competition for nutrients between microorganisms, the effect of nutrients on yeast cell and biofilm production and their correlation in the biocontrol of disease, the survival of yeast in citrus fruits and the interaction between microorganisms using scanning electron microscopy. Micronutrients (boric acid, cobalt chloride and ammonium molybdate) favoured the antagonistic action of A. pullulans. Ammonium sulfate 1% and sucrose 0.5% favoured the yeast during the competition between the microorganisms. The addition of ammonium sulfate (1%) in the yeast culture stimulated biofilm production and increased the antagonistic activity against the disease, as also allowed the better survival of yeast in wounded sites of citrus fruit. The yeast was found to be able to form biofilms on citrus, deforming the pathogen hyphae. These results showed the importance of the addition of nutrients in A. pullulans based-formulations when aiming for their use on a commercial scale. This is the first report of a positive correlation between the increase in the quantity of biofilm produced by A. pullulans, with increased antagonistic activity.
机译：评价了Aureobasidium pullulans菌株ACBL-77对柑桔土质（酸中的腐烂病原体）的生防效果，并评估了它们之间的相互作用。为此，评估了营养物的掺入以优化酵母的拮抗活性，微生物之间的营养物竞争，营养物对酵母细胞和生物膜产生的影响以及它们在疾病的生物防治中的相关性，酵母在柑橘中的存活。水果和微生物之间的相互作用使用扫描电子显微镜。微量营养素（硼酸，氯化钴和钼酸铵）有利于支链淀粉的拮抗作用。在微生物之间的竞争中，硫酸铵1％和蔗糖0.5％有利于酵母。在酵母培养物中添加硫酸铵（1％）刺激了生物膜的产生并增强了对这种疾病的拮抗活性，还使酵母在柑橘类水果的受伤部位具有更好的生存能力。发现该酵母能够在柑橘上形成生物膜，从而使病原菌的菌丝变形。这些结果表明，当将其以商业规模使用时，在以支链淀粉为基础的配方中添加营养非常重要。这是关于由支链淀粉产生的生物膜数量增加与拮抗活性增加之间呈正相关的第一个报道。

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