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Osmopriming-induced salt tolerance during seed germination of alfalfa most likely mediates through H2O2 signaling and upregulation of heme oxygenase

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Abstract

The present study showed that osmopriming or pretreatment with low H2O2 doses (2 mM) for 6 h alleviated salt-reduced seed germination. The NADPH oxidase activity was the main source, and superoxide dismutase (SOD) activity might be a secondary source of H2O2 generation during osmopriming or H2O2 pretreatment. Hematin pretreatment similar to osmopriming improved salt-reduced seed germination that was coincident with the enhancement of heme oxygenase (HO) activity. The semi-quantitative RT-PCR confirmed that osmopriming or H2O2 pretreatment was able to upregulate heme oxygenase HO-1 transcription, while the application of N,N-dimethyl thiourea (DMTU as trap of endogenous H2O2) and diphenyleneiodonium (DPI as inhibitor of NADPHox) not only blocked the upregulation of HO but also reversed the osmopriming-induced salt attenuation. The addition of CO-saturated aqueous rescued the inhibitory effect of DMTU and DPI on seed germination and α-amylase activity during osmopriming or H2O2 pretreatment, but H2O2 could not reverse the inhibitory effect of ZnPPIX (as HO inhibitor) or Hb (as CO scavenger) that indicates that the CO acts downstream of H2O2 in priming-driven salt acclimation. The antioxidant enzymes and proline synthesis were upregulated in roots of seedlings grown from primed seeds, and these responses were reversed by adding DMTU, ZnPPIX, and Hb during osmopriming. These findings for the first time suggest that H2O2 signaling and upregulation of heme oxygenase play a crucial role in priming-driven salt tolerance.

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Acknowledgements

This study was supported by a financial grant of Shahrekord University, Iran. Author thank Dr. Hashemi for his help in the semi-quantitative RT-PCR performance.

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  1. Biology Department, Science Faculty, Shahrekord University, Shahrekord, Iran

    Rayhaneh Amooaghaie & Fatemeh Tabatabaie

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  1. Rayhaneh Amooaghaie
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  2. Fatemeh Tabatabaie
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Correspondence to Rayhaneh Amooaghaie.

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Amooaghaie, R., Tabatabaie, F. Osmopriming-induced salt tolerance during seed germination of alfalfa most likely mediates through H2O2 signaling and upregulation of heme oxygenase. Protoplasma 254, 1791–1803 (2017). https://doi.org/10.1007/s00709-016-1069-5

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  • DOI: https://doi.org/10.1007/s00709-016-1069-5

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