Abstract
A hydroponic experiment was carried out to investigate the effects of sulfur (S) supply and hydrogen peroxide (H2O2) pretreatment on the growth and physiological responses by rice under cadmium (Cd) stress. Seedlings were grown with normal S level (3.4 mmol·L−1 sulfate), S deficiency (0 mmol·L−1 sulfate) for 6 days, or H2O2 (100 μmol·L−1) pretreatments for 1 day and subsequently exposed to 1.0 μmol·L−1 Cd for 7 days. In the S-deficient rice, both shoot and root Cd contents were increased 8.9 and 24.3 % respectively. In addition, cysteine (Cys), glutathione (GSH) and phytochelation (PC2–4) levels were increased significantly, while opposite effects were observed in the S-deficient rice. H2O2 pretreatment induced stronger Cd resistance in rice, as the amounts of thiols and the activity of glutathione S-transferase (GST) were all increased and the seedling growth was not inhibited by Cd stress. In conclusion, the results in this study demonstrated the adequate S supply and H2O2 pretreatment were important in Cd detoxification in rice through maintenance of cellular thiol levels and GST activity.
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Abbreviations
- ACN:
-
Acetonitrile
- Cd:
-
Cadmium
- DTPA:
-
Diethylenetriamine-pentaacetic acid
- GSH:
-
Reduced glutathione
- GST:
-
Glutathione S-transferase
- HEPES:
-
4-(2-Hydroxyethyl)-piperazine-1-propane sulfonic acid
- mBBr:
-
Monobromobimane
- MSA:
-
Methanesulfonic acid
- PCS:
-
Phytochelatin synthase
- PCs:
-
Phytochelatins
- ROS:
-
Reactive oxygen species
- RP-UPLC:
-
Reverse phase-ultra performance liquid chromatography
- TBA:
-
Thiobarbituric acid
- TBARS:
-
Thiobarbituric acid reactive substances
- TFA:
-
Trifluoroacetic acid
- TCEP:
-
Tris(β-chloroethyl)phosphate
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Acknowledgments
Financial support from the Natural Science Foundation of China (30700479) and Research Fund for the Doctoral Program of Higher Education of China (20090097110035, 20110097110004) and Research Fund of State Key Laboratory of Soil and Sustainable Agriculture, Nanjing Institute of Soil Science, Chinese Academy of Science (Y052010019) are gratefully acknowledged.
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Wu, Z., Zhang, C., Yan, J. et al. Effects of sulfur supply and hydrogen peroxide pretreatment on the responses by rice under cadmium stress. Plant Growth Regul 77, 299–306 (2015). https://doi.org/10.1007/s10725-015-0064-8
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DOI: https://doi.org/10.1007/s10725-015-0064-8