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  • Interspecific variation in extracellular polysaccharide content and colony formation of Microcystis spp. cultured under different light intensities and temperatures

    Author(s)
    Xu, Feng
    Zhu, Wei
    Xiao, Man
    Li, Ming
    Griffith University Author(s)
    Xiao, Man
    Year published
    2016
    Metadata
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    Abstract
    Single cells of five different Microcystis species (M. ichthyoblabe, M. viridis, M. flos-aquae, M. wesenbergii, and M. aeruginosa) were batch-cultured at different temperatures and light intensities: (a) 25 °C and 50 μmol photons m−2 s−1 (control culture); (b) 25 °C and 10 μmol photons m−2 s−1; and (c) 15 °C and 50 μmol photons m−2 s−1. The extracellular polysaccharide content was significantly higher in treatments b and c than in the control treatment. All Microcystis species existed as single cells under the control treatment but formed colonies in treatments b and c. All of the colonies were irregular with indistinct ...
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    Single cells of five different Microcystis species (M. ichthyoblabe, M. viridis, M. flos-aquae, M. wesenbergii, and M. aeruginosa) were batch-cultured at different temperatures and light intensities: (a) 25 °C and 50 μmol photons m−2 s−1 (control culture); (b) 25 °C and 10 μmol photons m−2 s−1; and (c) 15 °C and 50 μmol photons m−2 s−1. The extracellular polysaccharide content was significantly higher in treatments b and c than in the control treatment. All Microcystis species existed as single cells under the control treatment but formed colonies in treatments b and c. All of the colonies were irregular with indistinct margins. M. ichthyoblabe, M. viridis, M. flos-aquae, and M. wesenbergii formed colonies with similar morphologies and their cells were loosely aggregated. In contrast, M. aeruginosa formed denser colonies with no distinct holes. The colony morphologies differed from the classic morphology of M. ichthyoblabe field-grown colonies but resembled that of small colonies found in Lake Taihu (Yangtze Delta Plain, China) during early spring. This indicates that field- and laboratory-grown colonies are governed by similar formation processes. We suggest that in laboratory and field environments, M. ichthyoblabe (or M. flos-aquae) colonies are representative of small colonies formed from single Microcystis cells, whereas the morphology of older colonies evolves to resemble M. wesenbergii and M. aeruginosa colonies.
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    Journal Title
    Journal of Applied Phycology
    DOI
    https://doi.org/10.1007/s10811-015-0707-1
    Note
    This publication has been entered into Griffith Research Online as an Advanced Online Version.
    Subject
    Plant Biology not elsewhere classified
    Plant Biology
    Fisheries Sciences
    Environmental Biotechnology
    Publication URI
    http://hdl.handle.net/10072/101672
    Collection
    • Journal articles

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