Abstract
We evaluated the impact of low pH and aluminum (Al) on the leaves and roots of Plantago almogravensis Franco and Plantago algarbiensis Samp., focusing on energy partitioning in photosystem II, H2O2 levels, lipid peroxidation, electrolyte leakage (EL), protein oxidation, total soluble protein content and antioxidant enzyme activities. In both species, Al triggered more changes in oxidative metabolism than low pH alone, particularly in the roots. We found that Al increased the levels of H2O2 in P. algarbiensis roots, but reduced the levels of H2O2 in P. almogravensis leaves and roots. Neither low pH nor Al affected the spatial heterogeneity of chlorophyll fluorescence, the maximum photochemical efficiency of PSII (Fv/Fm), the actual quantum efficiency of PSII (ϕPSII) or the quantum yields of regulated (ϕNPQ) and nonregulated (ϕNO) energy dissipation, and there was no significant change in total soluble protein content and EL. In P. algarbiensis, Al increased the carbonyl content and the activities of superoxide dismutase (SOD) and catalase (CAT) in the roots, and also CAT, ascorbate peroxidase and guaiacol peroxidase activities in the leaves. In P. almogravensis, Al reduced the level of malondialdehyde in the roots as well as SOD activity in the leaves and roots. We found that P. almogravensis plantlets could manage the oxidative stress caused by low pH and Al, whereas the P. algarbiensis antioxidant system was unable to suppress Al toxicity completely, leading to the accumulation of H2O2 and consequential protein oxidation in the roots.
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Abbreviations
- APX:
-
Ascorbate peroxidase
- CAT:
-
Catalase
- EL:
-
Electrolyte leakage
- Fv/Fm :
-
Maximum photochemical efficiency of PSII
- FW:
-
Fresh weight
- GPX:
-
Guaiacol peroxidase
- MDA:
-
Malondialdehyde
- MS:
-
Murashige and Skoog
- NBT:
-
Nitroblue tetrazolium
- PSII:
-
Photosystem II
- PVPP:
-
Polyvinylpolypyrrolidone
- ROS:
-
Reactive oxygen species
- SOD:
-
Superoxide dismutase
- TBA:
-
Thiobarbituric acid
- TCA:
-
Trichloroacetic acid
- ϕNPQ :
-
Quantum yield of regulated energy dissipation
- ϕNO :
-
Quantum yield of nonregulated energy dissipation
- ϕPSII :
-
Actual quantum efficiency of PSII
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Acknowledgments
N. Martins, M.L. Osório and S. Gonçalves acknowledge grants from the Portuguese Science and Technology Foundation (FCT, SFRH/BD/48379/2008, SFRH/BPD/35410/2007 and SFRH/BPD/31534/2006, respectively). This work was supported by the FCT project PTDC/AGR-AAM/102664/2008.
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Martins, N., Osório, M.L., Gonçalves, S. et al. Differences in Al tolerance between Plantago algarbiensis and P. almogravensis reflect their ability to respond to oxidative stress. Biometals 26, 427–437 (2013). https://doi.org/10.1007/s10534-013-9625-3
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DOI: https://doi.org/10.1007/s10534-013-9625-3