The present study evaluated the effects of five bacterial isolates from the microalga Muriellopsis sp. on the microalgal biomass concentration (g/L), specific growth rate (K), photosynthetic quantum yield (QY), non‐photochemical quenching (NPQ), maximum relative electron transport rates (rETR max) and levels of nutritional components such as carbohydrates, lipids, proteins and carotenoids in Muriellopsis sp. cultivated in seawater under indoor and outdoor conditions. The bacterial strains were Microbacterium sp. Dom 1; Pseudomonas sp. Dom2; Microbacterium sp. Dom 3; Rhizobium sp. Dom 4; and Dietzia sp. Dom 5, as well as the Pseudoalteromonas sp. (SLP1), a bacterium known to promote the growth of microalgae. At the laboratory level, inoculation of the strains SLP1, Dom 1, Dom 3 and Dom 5 resulted in higher specific growth rates and biomass of the microalga. Subsequently, the best results were obtained with a combination of the selected bacterial strains (Dom1, Dom 3, Dom5 and SLP1) under outdoor culture conditions improved the biomass, proteins, carbohydrates and total carotenoids in 22.12%, 48.28%, 19,25% and 48.27%, respectively, compared to cultures without the incorporation of the selected bacteria (control), while no effects were observed on the photosynthetic parameters. Thus, it was demonstrated that positive associations of the selected bacterial strains played an important role in the production of Muriellopsis sp. acclimatized to grow in seawater. This is of crucial importance, especially in desert areas, where solar radiation is high and freshwater is a limited resource.

中文翻译：

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有益细菌对微藻Muriellopsis sp。的生物量，光合参数和细胞组成的影响。适于在海水中生长

本研究评估了来自微藻Muriellopsis sp。的五个细菌分离物的作用。微藻生物质浓度（g / L），比生长率（K），光合量子产率（QY），非光化学猝灭（NPQ），最大相对电子传输率（rETR max）和营养成分（例如碳水化合物）的水平，Muriellopsis sp。中的脂质，蛋白质和类胡萝卜素。在室内和室外条件下在海水中养殖。细菌菌株是Microbacterium sp.。Dom 1；假单胞菌属。Dom2; 微杆菌属。Dom 3; 根瘤菌属。Dom 4; 和Dietzia sp。Dom 5，以及假单胞菌sp。（SLP1），一种已知能促进微藻生长的细菌。在实验室水平上，菌株SLP1，Dom 1，Dom 3和Dom 5的接种导致更高的比生长速率和微藻的生物量。随后，在室外培养条件下，结合所选细菌菌株（Dom1，Dom 3，Dom5和SLP1）获得了最佳结果，将生物量，蛋白质，碳水化合物和总类胡萝卜素的含量分别提高了22.12％，48.28％，19.25％与未掺入所选细菌的培养物（对照）相比，分别为18.2％和48.27％，而对光合作用参数没有影响。因此，证明了所选细菌菌株的正相关在穆氏菌病的产生中起重要作用。sp。适应在海水中生长。这至关重要，特别是在沙漠地区，那里的太阳辐射很高，而淡水是有限的资源。