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Importance of intracellular Fe pools on growth of marine diatoms by using unialgal cultures and on the Oyashio region phytoplankton community during spring

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Please use this identifier to cite or link to this item:http://hdl.handle.net/2115/49807

Title: Importance of intracellular Fe pools on growth of marine diatoms by using unialgal cultures and on the Oyashio region phytoplankton community during spring
Authors: Sugie, Koji Browse this author
Kuma, Kenshi Browse this author →KAKEN DB
Fujita, Satoshi Browse this author
Ushizaka, Satomi Browse this author
Suzuki, Koji Browse this author
Ikeda, Tsutomu Browse this author →KAKEN DB
Keywords: Fe storage
intracellular Fe
luxury Fe uptake
Centric diatoms
Survival strategy
Issue Date: Apr-2011
Publisher: Springer Verlag
Journal Title: Journal of Oceanography
Volume: 67
Issue: 2
Start Page: 183
End Page: 196
Publisher DOI: 10.1007/s10872-011-0017-4
Abstract: We report on the ability for luxury Fe uptake and the potential for growth utilizing intracellular Fe pools for 4 coastal centric diatom isolates and in situ phytoplankton assemblages, mainly composed of diatoms. Iron uptake of the diatom isolates and natural phytoplankton assemblages in the Oyashio region during spring blooms were prevented by adding hydroxamate siderophore desferrioxamine B (DFB). After the addition of DFB, intracellular Fe in the diatom isolates supported 2.4–4.2 cell divisions with 1.2–2.6 Chl a doublings. The intracellular Fe was primarily used for cell generation rather than Chl a production, leading to a reduction in the Chl a cell quota in the Fe-starved cells with time. The metabolic properties of the Fe-starved cells with their cell morphologies were different among species or genera. An on-deck incubation experiment also exhibited 1.9 cell divisions and 0.81 Chl a doublings of phytoplankton after the addition of DFB, also indicating the preference of cell generation over Chl a production. A decrease in the level of cellular Chl a, a main light-harvesting pigment in Fe-starved diatoms, may become a superior survival strategy to protect the cells from high irradiance that can cause photo-oxidative damages through photosynthesis. Such relatively low-Fe with high-light conditions could often occur in surface waters of the Oyashio region from spring to summer
Type: article (author version)
URI: http://hdl.handle.net/2115/49807
Appears in Collections:環境科学院・地球環境科学研究院 (Graduate School of Environmental Science / Faculty of Environmental Earth Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 杉江 恒二

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