Growth and photosynthetic response of the cyanobacterium Microcystis aeruginosa in relation to photoperiodicity and irradiance |
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Authors: | Wanda Zevenboom Luuc R Mur |
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Institution: | (1) Laboratorium voor Microbiologie, Universiteit van Amsterdam, Nieuwe Achtergracht 127, NL-1018 WS Amsterdam, The Netherlands |
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Abstract: | Growth and photosynthetic characteristics, P
max (maximum light-saturated oxygen production rate) and (photosynthetic affinity), of Microcystis aeruginosa were studied in continuous cultures under a range of photoperiod lengths and growth irradiances.
Microcystis showed a low specific maintenance rate constant and a high growth affinity for light (typical cyanobacterial features), but required a dark period to obtain maximum growth rate. P
max and per unit dry weight increased, as did pigment content, when less light became available. By regulation in and P
max (crucial in light-limiting and high-light conditions, respectively) this buoyant species can flourish in low light, but also in high-light environments which may arise when buoyancy is lost.The two different types of light conditions affected growth, and photosynthesis, in different ways. One needs thus to discriminate between photoperiod- and irradiance-limitation, which restricts the utility of simple algal growth models. It was emphasized that photosynthetic adaptation patterns of light-limited species may resemble short-term nutrient uptake kinetics of nutrient-limited organisms.With prior knowledge of the growth limitation, we were able to assess the growth rate of a natural population of Microcystis from its photosynthetic response and from data of laboratory cultures of a known physiological state. |
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Keywords: | Microcystis aeruginosa Cyanobacterium Continuous cultures Photoperiodicity Growth irradiance Light-limitation Adaptation in photosynthesis Natural population |
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