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首页> 外文期刊>Harmful Algae >A mutualistic interaction between the bacterium Pseudomonas asplenii and the harmful algal species Chattonella marina (Raphidophyceae)
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A mutualistic interaction between the bacterium Pseudomonas asplenii and the harmful algal species Chattonella marina (Raphidophyceae)

机译：细菌假单胞菌和有害藻种滨海沙通氏菌（Raphidophyceae）之间的相互作用

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Several studies on various Chattonella species have reported that bacteria may play an important role in Chattonella bloom initiation, however, no studies have described how these bacteria promote the growth of C. marina. The interaction between C. marina and bacteria was investigated for identification and characterization of potential growth-promoting bacteria. In preliminary tests, the growth promoting effect of Pseudomonas species (25 strains) was investigated and P. asplenii (>= 2.27) was determined as a growth-promoting bacteria for both C. marina strains (CCMP 2049 and 2050). This bacterium exerted optimal growth-promoting effects on C. marina, causing an increase in the initial density of P. asplenii to approximately 1 x 10(7) cells which was used as the initial density in this study. To determine whether the growth-promoting activity was direct or indirect, P. asplenii was incubated in the algal media and then a filtrate of this culture was added to both C. marina strains. The P. asplenii filtrate stimulated the growth of C. marina and maintained the growth-promoting effects after high temperature (121 degrees C for 20 min) and pressure (15 psi) treatment. Thus, P. asplenii is able to promote C. marina growth through the release of a heat-resistant substance, such as inorganic nutrients. A nutrient analysis indicated that this bacterium elevated the phosphate concentration. Interestingly, P. asplenii was unable to survive in phosphate-limited media but could grow in phosphate-limited media incubating C. marina. Moreover, this bacterium could secrete significantly more phosphate in the presence of C. marina (p < 0.0001). These results suggested that P. asplenii and C. marina may have a mutualistic interaction. (C) 2016 Elsevier B.V. All rights reserved.
机译：对各种沙通氏菌物种的一些研究报告说，细菌可能在沙通氏菌开花的起始过程中发挥重要作用，但是，没有研究描述这些细菌如何促进滨海假丝酵母的生长。研究了滨海梭菌和细菌之间的相互作用，以鉴定和表征潜在的促进生长的细菌。在初步测试中，研究了假单胞菌属物种（25个菌株）的生长促进作用，并且确定了假单胞菌（> = 2.27）作为两种滨海梭菌菌株（CCMP 2049和2050）的生长促进细菌。该细菌对滨海假单胞菌发挥了最佳的生长促进作用，导致了麻黄假单胞菌的初始密度增加到大约1 x 10（7）细胞，该细胞在本研究中用作初始密度。为了确定生长促进活性是直接的还是间接的，将阿斯毕尼酵母在藻类培养基中温育，然后将该培养物的滤液加入到两个滨海假丝酵母菌株中。在高温（121摄氏度，持续20分钟）和压力（15磅/平方英寸）处理之后，海藻假单胞菌滤液刺激了滨海假单胞菌的生长并保持了促进生长的作用。因此，Aplenii能够通过释放诸如无机养分等耐热物质来促进滨海假丝酵母的生长。营养成分分析表明该细菌提高了磷酸盐浓度。有趣的是，P。asplenii无法在磷酸盐限制的培养基中存活，但可以在孵化滨海假单胞菌的磷酸盐限制的培养基中生长。此外，在滨海假单胞菌的存在下，该细菌可以分泌更多的磷酸盐（p <0.0001）。这些结果表明，P。asplenii和C. marina可能具有相互的相互作用。 （C）2016 Elsevier B.V.保留所有权利。

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