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首页> 外文期刊>Biochemical Systematics and Ecology >Differences in growth, pigment composition and photosynthetic rates of two phenotypes Microcystis aeruginosa strains under high and low iron conditions
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Differences in growth, pigment composition and photosynthetic rates of two phenotypes Microcystis aeruginosa strains under high and low iron conditions

机译：高铁和低铁条件下两种铜绿微囊藻菌株的生长，色素组成和光合速率的差异

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This paper provided insight into the influence of iron on the growth of Microcystis aeruginosa strains related to different phenotypes of this species. In this research it was intended to compare the growth, pigment composition, photosynthetic efficiency and extracellular polysaccharides production of unicellular and colonial strains of M. aeruginosa. A significantly growth inhibition under iron-limited condition on unicellular M. aeruginosa was noted, whereas the colonial strain could maintain a steady growth along with the culture time. This observation was reconfirmed by the content of chlorophyll a. Compared with unicellular strain; the colonial strain exhibited a higher PSII maximum light energy transformation, photosynthetic oxygen evolution and extracellular polysaccharides (EPS) production in iron-limited condition. Further, in order to gain more information about the accessibility of iron in the two phenotypic Microcystis, we found the two strains could produce hydroxamate-type siderophores, the content of siderophores produced by the colonial strain was more than those in unicellular strain under the iron-limited condition. It was interpreted as an adaptation to the dilute environment. Our results demonstrated that the colonial phenotypes possessed stronger ability to endure iron-limited condition than unicellular strain by higher pigment contents, higher photosynthetic activities, higher EPS production and higher siderophores secretion. It might elucidate that the colonial M. aeruginosa bloom can sustain in eutrophic reservoirs and lakes
机译：本文提供了有关铁对与该物种不同表型有关的铜绿微囊藻菌株生长的影响的见解。在这项研究中，目的是比较铜绿假单胞菌单细胞和菌落菌株的生长，色素组成，光合作用效率和细胞外多糖产量。注意到在铁限制条件下对单细胞铜绿假单胞菌有明显的生长抑制作用，而殖民菌株可以随培养时间保持稳定的生长。叶绿素a的含量再次证实了这一观察结果。与单细胞株相比;在铁限制条件下，该菌落菌株表现出更高的PSII最大光能转化，光合氧气释放和细胞外多糖（EPS）产生。此外，为了获得更多关于铁在两个表型微囊藻中的可及性的信息，我们发现这两个菌株都可以产生异羟肟酸酯型铁载体，由菌落产生的铁载体的含量比铁下单细胞菌株中的含量高。有限的条件。它被解释为对稀薄环境的适应。我们的结果表明，与单细胞菌株相比，较高的色素含量，较高的光合作用活性，较高的EPS产量和较高的铁载体分泌能力使结肠表型具有比单细胞菌株更强的铁限制条件。这可能说明殖民地的铜绿假单胞菌花可以在富营养化的水库和湖泊中维持

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