ABSTRACT: Macroalgae provide important habitats for microorganisms, with surfaces that are rich in nutrients and a microbial niche for isolation of different bacterial groups. In this study, we evaluated the production of enzymes (amylases, lipases, cellulases and agarases) and siderophores by strains isolated from the macroalga Ulva lactuca growing in the Santa Marta region of the Colombian Caribbean Sea. We taxonomically identified a subset of the bacteria and tested 207 bacterial isolates. Of these, 25 (12%) and 121 (58%) produced agarases and siderophores, respectively. Out of the isolated bacteria with amylolytic (97), cellulolytic (118) and lipolytic (26) activity, 31 (32%), 78 (66%) and 4 (15%) strains, respectively, produced a zone of clearance >1.5 cm, indicating substantial activity. Enzymatic activities and siderophore production were statistically different between years of sampling, and principal component analysis showed grouping for samples from the same year. These activities and production were recorded in bacterial strains belonging to the genera Vibrio, Pseudomonas and Bacillus. The results show that marine bacterial cultures isolated from the macroalga U. lactuca are a source of enzymes and siderophores that may have potential for biotechnological and industrial processes.

中文翻译：

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分离自海洋大型藻类Ulva lactuca的附生细菌产生的酶和铁载体

摘要：大型藻类为微生物提供了重要的栖息地，其表面富含营养成分，并具有微生物生态位，可用于分离不同的细菌群。在这项研究中，我们评估了从巨藻Ulva lactuca分离出的菌株产生的酶（淀粉酶，脂肪酶，纤维素酶和琼脂酶）和铁载体的产生。生长在哥伦比亚加勒比海的圣玛尔塔地区。我们在分类学上确定了细菌的一部分，并测试了207个细菌分离株。其中，分别产生25（12％）和121（58％）的琼脂糖酶和铁载体。在分离的具有淀粉分解酶（97），纤维素分解酶（118）和脂肪分解酶（26）活性的细菌中，分别有31（32％），78（66％）和4（15％）菌株产生清除区，其> 1.5厘米，表明活动活跃。采样年之间的酶活性和铁载体的产生在统计学上是不同的，并且主成分分析显示了同一年的样品分组。在属于弧菌，假单胞菌和芽孢杆菌属的细菌菌株中记录了这些活性和产生。。结果表明，从大型藻类U. lactuca分离出来的海洋细菌培养物是酶和铁载体的来源，可能对生物技术和工业生产过程具有潜在作用。