Differences in growth,pigment composition and photosynthetic rates of two phenotypes Microcystis aeruginosa strains under high and low iron conditions |
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| Institution: | 1. Carbon Materials Research Group, Department of Inorganic Chemistry, Faculty of Sciences, University of Granada, Campus Fuentenueva s/n, 18071 Granada, Spain;2. Department of Inorganic and Organic Chemistry, Faculty of Experimental Sciences, University of Jaén, 23071 Jaén, Spain;1. Department of Hydrobiology, Universidade Federal de São Carlos, Rodovia Washington Luís, Km 235, 13565-905, São Carlos, SP, Brazil;2. Post-Graduate Program in Ecology and Natural Resources (PPGERN), Universidade Federal de São Carlos (UFSCar), Rodovia Washington Luís, Km 235, 13565-905, São Carlos, SP, Brazil;3. Nanomedicine and Nanotoxicology Group, Physics Institute of São Carlos – Universidade de São Paulo (USP), Avenida Trabalhador São-carlense, 400, Parque Arnold Schimidt, 13566-590, São Carlos, SP, Brazil;4. NEEA/CRHEA/SHS, São Carlos School of Engineering, Universidade de São Paulo, Avenida Trabalhador São-Carlense 400, 13560-970, São Carlos, SP, Brazil;5. Department of Botany. Universidade Federal de São Carlos, Rodovia Washington Luís, Km 235, 13565-905, São Carlos, SP, Brazil;1. Institute for Molecular Biosciences, Goethe University Frankfurt, Frankfurt, Germany;2. Frankfurt Institute of Advanced Studies, Frankfurt, Germany;3. Buchman Institute for Molecular Life Sciences, Goethe University Frankfurt, Frankfurt, Germany;1. Environmental Microbiomics Research Center, School of Environmental Science and Engineering, Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Sun Yat-sen University, Guangzhou, 510006, Guangdong, China;2. Department of Biological Sciences, GRIL - EcotoQ - TOXEN, Ecotoxicology of Aquatic Microorganisms Laboratory, Université Du Québec à Montréal, Succursale Centre-Ville, Montreal, Quebec, Canada;3. Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Sun Yat-sen University, Guangzhou, 510006, Guangdong, China;4. School of Life Sciences, Central China Normal University, Wuhan, 430079, Hubei, China;5. South China Sea Institution, Sun Yat-sen University, Zhuhai, 519082, China;6. College of Agronomy, Hunan Agricultural University, Changsha, 410128, Hunan, China |
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| Abstract: | 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. |
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| Keywords: | Growth Pigment composition Photosynthetic rates Phenotype |
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