Abstract
Hydrogen sulfide (H2S) has proved to be a multifunctional signaling molecule involved in plant development and response to abiotic stresses. In the present study, the effects of H2S donor, sodium hydrosulfide (NaHS) on the germination of wheat (Triticum aestivum L.) grains under cadmium stress was investigated. With the increase in Cd concentration, the germination percentage of wheat grains decreased steadily. NaHS pretreatment alleviated cadmium-induced germination inhibition in a dose-dependent manner, with the optimal concentration of 0.9 mM. Further studies showed that NaHS pretreatment could promote the activities of amylase and esterase, reducing cadmium-induced disturbance of plasma membrane integrity in the radicle tips, and sustain lower levels of superoxide radicals, hydrogen peroxide and malondialdehyde in germinating wheat grains. Besides, NaHS significantly promoted the accumulation of free amino acids in grains exposed to cadmium. Further investigation showed that NaHS pretreatment stimulated the activities of peroxidase, catalase and acorbate peroxidase and inhibited that of lipoxygenase. In addition, a higher level of endogenous H2S in wheat grains was observed in NaHS-pretreated wheat grains. These data indicate that H2S ameliorated cadmium-stress in germinating wheat grains by modulating the antioxidant system.
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Acknowledgments
The authors acknowledge the support from Russell Jones for critical reading of the manuscript. This work was supported by the Natural Science Foundation of China (31271803, 31301820, 31300133), the Scientific Research Foundation for the Returned Overseas Chinese Scholars (SRF for ROCS, MOE), the Natural Science Foundations of Anhui Province (11040606M85), the Anhui Provincial Education Department (2012AJZR0028), and Open Fund of Key Laboratory of Cell Proliferation and Regulation Biology, Ministry of Education.
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The authors declare that they have no conflict of interest and do not have any financial relationship with the organization that sponsored the research in the manuscript.
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Huang, ZQ., Ye, SC., Hu, LY. et al. Hydrogen Sulfide Promotes Wheat Grain Germination Under Cadmium Stress. Proc. Natl. Acad. Sci., India, Sect. B Biol. Sci. 86, 887–895 (2016). https://doi.org/10.1007/s40011-015-0554-5
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DOI: https://doi.org/10.1007/s40011-015-0554-5