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Title: | The pH strongly influences the uranium-induced effects on the photosynthetic apparatus of Arabidopsis thaliana plants | Authors: | SAENEN, Eline HOREMANS, Nele VANHOUDT, Nathalie Varidenhove, Hildegarde BIERMANS, Geert Van Hees, May Wannijn, Jean VANGRONSVELD, Jaco CUYPERS, Ann |
Issue Date: | 2014 | Source: | PLANT PHYSIOLOGY AND BIOCHEMISTRY, 82, p. 254-261 | Abstract: | To study the impact of environmental uranium (U) contamination, effects should be analysed at different environmentally relevant pH levels as the speciation of U, and hence its toxicity, is strongly dependent on the pH. As photosynthesis is a major energy producing process in plants intimately connected to plant growth and known to be susceptible to metal stress, the effects of different U concentrations on photosynthesis in 18-day-old Arabidopsis thaliana (Columbia ecotype) are investigated at two contrasting pH levels, 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. The lower U concentrations in the shoots at pH 4.5 are accompanied by a more reduced leaf growth as compared to pH 7.5. In addition, 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 transport 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 oxidative 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. (C) 2014 Published by Elsevier Masson SAS. | Notes: | Saenen, E (reprint author), CEN SCK, Belgian Nucl Res Ctr, Biosphere Impact Studies, Boeretang 2000, B-2400 Mol, Belgium.eline.saenen@sckcen.be | Keywords: | arabidopsis thaliana; photosynthesis; pH; uranium | Document URI: | http://hdl.handle.net/1942/17206 | ISSN: | 0981-9428 | e-ISSN: | 1873-2690 | DOI: | 10.1016/j.plaphy.2014.06.012 | ISI #: | 000340698800029 | Rights: | © 2014 Published by Elsevier Masson SAS. | Category: | A1 | Type: | Journal Contribution | Validations: | ecoom 2015 |
Appears in Collections: | Research publications |
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