The pH strongly influences the uranium-induced effects on the photosynthetic apparatus of Arabidopsis thaliana plants

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@article{a8060536ca75427a992d95d422e0da62,
title = "The pH strongly influences the uranium-induced effects on the photosynthetic apparatus of Arabidopsis thaliana plants",
abstract = "To study the impact of environmental uranium contamination, effects should be analysed at different environmentally relevant pH levels as the speciation of U is strongly dependent on the pH. As photosynthesis is a major energy producing process in plants, the effects of different U concentrations on photosynthesis in 18-day-old Arabidopsis thaliana are investigated at pH 4.5 and pH 7.5. At pH 4.5, U is highly taken up by the roots but is poorly translocated to the shoots, while at pH 7.5, less U is taken up but the translocation is higher.U does not influence the photosynthetic machinery at pH 7.5, while an optimization of the photosynthesis takes place after U exposure at pH 4.5. As such, more of the absorbed quanta are effectively used for photosynthesis accompanied by a decreased non-photochemical quenching and an increased electron tranposrt rate. Since the enhanced photosynthesis at pH 4.5 is accompanied by a decreased growth, we suggest that the energy produced during photosynthesis is used for defence reactions against U-induced oxidtaive stress rather than for growth. As such, a high discrepancy was observed between the two pH levels, with an optimized photosynthetic apparatus at pH 4.5 and almost no effects at pH 7.5.",
keywords = "Arabidopsis thaliana, Photosynthesis, pH, Uranium",
author = "Eline Saenen and Nele Horemans and Nathalie Vanhoudt and Hildegarde Vandenhove and Geert Biermans and {Van Hees}, May and Jean Wannijn and Jaco Vangronsveld and Ann Cuypers and Hans Vanmarcke",
note = "Score = 10",
year = "2014",
month = "9",
language = "English",
volume = "82",
pages = "254--261",
journal = "Plant Physiology and Biochemistry",
issn = "0981-9428",
publisher = "Elsevier",

}

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TY - JOUR

T1 - The pH strongly influences the uranium-induced effects on the photosynthetic apparatus of Arabidopsis thaliana plants

AU - Saenen, Eline

AU - Horemans, Nele

AU - Vanhoudt, Nathalie

AU - Vandenhove, Hildegarde

AU - Biermans, Geert

AU - Van Hees, May

AU - Wannijn, Jean

AU - Vangronsveld, Jaco

AU - Cuypers, Ann

A2 - Vanmarcke, Hans

N1 - Score = 10

PY - 2014/9

Y1 - 2014/9

N2 - To study the impact of environmental uranium contamination, effects should be analysed at different environmentally relevant pH levels as the speciation of U is strongly dependent on the pH. As photosynthesis is a major energy producing process in plants, the effects of different U concentrations on photosynthesis in 18-day-old Arabidopsis thaliana are investigated at pH 4.5 and pH 7.5. At pH 4.5, U is highly taken up by the roots but is poorly translocated to the shoots, while at pH 7.5, less U is taken up but the translocation is higher.U does not influence the photosynthetic machinery at pH 7.5, while an optimization of the photosynthesis takes place after U exposure at pH 4.5. As such, more of the absorbed quanta are effectively used for photosynthesis accompanied by a decreased non-photochemical quenching and an increased electron tranposrt rate. Since the enhanced photosynthesis at pH 4.5 is accompanied by a decreased growth, we suggest that the energy produced during photosynthesis is used for defence reactions against U-induced oxidtaive stress rather than for growth. As such, a high discrepancy was observed between the two pH levels, with an optimized photosynthetic apparatus at pH 4.5 and almost no effects at pH 7.5.

AB - To study the impact of environmental uranium contamination, effects should be analysed at different environmentally relevant pH levels as the speciation of U is strongly dependent on the pH. As photosynthesis is a major energy producing process in plants, the effects of different U concentrations on photosynthesis in 18-day-old Arabidopsis thaliana are investigated at pH 4.5 and pH 7.5. At pH 4.5, U is highly taken up by the roots but is poorly translocated to the shoots, while at pH 7.5, less U is taken up but the translocation is higher.U does not influence the photosynthetic machinery at pH 7.5, while an optimization of the photosynthesis takes place after U exposure at pH 4.5. As such, more of the absorbed quanta are effectively used for photosynthesis accompanied by a decreased non-photochemical quenching and an increased electron tranposrt rate. Since the enhanced photosynthesis at pH 4.5 is accompanied by a decreased growth, we suggest that the energy produced during photosynthesis is used for defence reactions against U-induced oxidtaive stress rather than for growth. As such, a high discrepancy was observed between the two pH levels, with an optimized photosynthetic apparatus at pH 4.5 and almost no effects at pH 7.5.

KW - Arabidopsis thaliana

KW - Photosynthesis

KW - pH

KW - Uranium

UR - http://ecm.sckcen.be/OTCS/llisapi.dll/open/ezp_137811

UR - http://knowledgecentre.sckcen.be/so2/bibref/12085

M3 - Article

VL - 82

SP - 254

EP - 261

JO - Plant Physiology and Biochemistry

JF - Plant Physiology and Biochemistry

SN - 0981-9428

ER -

ID: 265056