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Int. J. Mol. Sci. 2017, 18(12), 2570; https://doi.org/10.3390/ijms18122570

Sulfur-Mediated-Alleviation of Aluminum-Toxicity in Citrus grandis Seedlings

1
Institute of Plant Nutritional Physiology and Molecular Biology, College of Resources and Environment, Fujian Agriculture and Forestry University (FAFU), Fuzhou 350002, China
2
Institute of Materia Medica, Fujian Academy of Medical Sciences, Fuzhou 350002, China
3
Fujian Provincial Key Laboratory of Soil Environmental Health and Regulation, College of Resources and Environment, FAFU, Fuzhou 350002, China
4
The Higher Education Key Laboratory of Fujian Province for Soil Ecosystem Health and Regulation, College of Resources and Environment, FAFU, Fuzhou 350002, China
*
Author to whom correspondence should be addressed.
Received: 28 October 2017 / Revised: 25 November 2017 / Accepted: 26 November 2017 / Published: 3 December 2017
(This article belongs to the Special Issue Metabolomics in the Plant Sciences 2017)
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Abstract

Limited data are available on the sulfur (S)-mediated-alleviation of aluminum (Al)-toxicity in higher plants. Citrus grandis seedlings were irrigated for 18 weeks with 0.5 mM MgSO4 or 0.5 mM MgSO4 + 0.5 mM Na2SO4, and 0 (−Al) or 1 mM AlCl3·6H2O (+Al, Al-toxicity). Under Al-toxicity, S decreased the level of Al in leaves; increased the relative water content (RWC) of roots and leaves, the contents of phosphorus (P), calcium (Ca) and magnesium (Mg) per plant, the dry weights (DW) of roots and shoots, the ratios of root DW/shoot DW, and the Al-induced secretion of citrate from root; and alleviated the Al-induced inhibition of photosynthesis via mitigating the Al-induced decrease of electron transport capacity resulting from the impaired photosynthetic electron transport chain. In addition to decreasing the Al-stimulated H2O2 production, the S-induced upregulation of both S metabolism-related enzymes and antioxidant enzymes also contributed to the S-mediated-alleviation of oxidative damage in Al-treated roots and leaves. Decreased transport of Al from roots to shoots and relatively little accumulation of Al in leaves, and increased leaf and root RWC and P, Ca, and Mg contents per plant might also play a role in the S-mediated-alleviation of Al-toxicity. View Full-Text
Keywords: aluminum-toxicity; antioxidant enzymes; Citrus grandis; photosynthesis; sulfur metabolism aluminum-toxicity; antioxidant enzymes; Citrus grandis; photosynthesis; sulfur metabolism
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Guo, P.; Li, Q.; Qi, Y.-P.; Yang, L.-T.; Ye, X.; Chen, H.-H.; Chen, L.-S. Sulfur-Mediated-Alleviation of Aluminum-Toxicity in Citrus grandis Seedlings. Int. J. Mol. Sci. 2017, 18, 2570.

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