NDLI: Comparison of two different modes of UV-B irradiation on synthesis of some cellular substances in the cyanobacterium Synechocystis sp. PCC6803

Content Provider	Springer Nature Link
Author	Marxen, Kai Vanselow, Klaus Heinrich Hintze, Ralf Lippemeier, Sebastian Ruser, Andreas Egge, Britta Colijn, Franciscus Hansen, Ulf Peter
Copyright Year	2010
Abstract	Two different modes of UV-B irradiation of the cyanobacterium Synechocystis sp. PCC 6803 are compared: turbidostatic control and additional physiostatic control. Under turbidostatic control, the cells were exposed to different constant UV-B irradiances, whereas under physiostatic control, an electronic control loop modulated UV-B irradiance in such a way that photosynthetic efficiency ϕ $_{PSII}$ was kept constant at a fixed set point. The UV-B-induced stimulation of the synthesis of pigments, α-tocopherol, and the antioxidative potential of methanolic soluble components of Synechocystis showed significant differences depending on the mode of irradiation, even though the overall doses were equal. For example, compared to the initial values, the concentrations of myxoxanthophyll and zeaxanthin increased to 226–244% and 453% upon constant UV-B irradiation in turbidostatic processes, whereas maxima of 600% and 740% were reached in turbidostatic process with additional physiostatic control. The α-tocopherol concentration increased under constant UV-B irradiances, up to a maximum of 150%. Under physiological control, however, maximum increases of 390% over the initial values were measured. Furthermore, a reaction scheme is given explaining the higher yield under physiostatic control.
Starting Page	677
Ending Page	690
Page Count	14
File Format	PDF
ISSN	09218971
Journal	Journal of Applied Phycology
Volume Number	22
Issue Number	6
e-ISSN	15735176
Language	English
Publisher	Springer Netherlands
Publisher Date	2010-02-27
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Physiological control UV-B irradiance Physiostat Turbidostat Carotenoids Phycobilisomes α-Tocopherol Ecology Plant Physiology Freshwater & Marine Ecology Plant Sciences
Content Type	Text
Resource Type	Article
Subject	Plant Science Aquatic Science

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