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The efficacy of different seed priming agents for promoting sorghum germination under salt stress

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  • Xiaofei Chen
  • Ruidong Zhang
  • Yifan Xing
  • Bing Jiang
  • Bang Li
  • Xiaoxue Xu
  • Yufei Zhou

Abstract

Sorghum [Sorghum bicolor (L.) Moench] seed germination is sensitive to salinity, and seed priming is an effective method for alleviating the negative effects of salt stress on seed germination. However, few studies have compared the effects of different priming agents on sorghum germination under salt stress. In this study, we quantified the effects of priming with distilled water (HP), sodium chloride (NaCl), potassium chloride (KCl), calcium chloride (CaCl2), and polyethylene glycol (PEG) on sorghum seed germination under 150 mM NaCl stress. The germination potential, germination rate, germination index, vigor index, root length, shoot length, root fresh weight, shoot fresh weight, root dry weight, and shoot dry weight were significantly reduced by salt stress. Different priming treatments alleviated the germination inhibition caused by salt stress to varying degrees, and 50 mM CaCl2 was the most effective treatment. In addition, the mitigation effect of priming was stronger on root traits than on shoot traits. Mitigation efficacy was closely related to both the type of agent and the concentration of the solution. Principal component analysis showed that all concentrations of CaCl2 had higher scores and were clearly distinguished from other treatments based on their positive effects on all germination traits. The effects of the other agents varied with concentration. The priming treatments were divided into three categories based on their priming efficacy, and the 50, 100, and 150 mM CaCl2 treatments were placed in the first category. The 150 mM KCl, 10% PEG, HP, 150 mM NaCl, 30% PEG, and 50 mM KCl treatments were placed in the second category, and the 100 mM NaCl, 100 mM KCl, 20% PEG, and 50 mM NaCl treatments were least effective and were placed in the third category. Choosing appropriate priming agents and methods for future research and applications can ensure that crop seeds germinate healthily under saline conditions.

Suggested Citation

  • Xiaofei Chen & Ruidong Zhang & Yifan Xing & Bing Jiang & Bang Li & Xiaoxue Xu & Yufei Zhou, 2021. "The efficacy of different seed priming agents for promoting sorghum germination under salt stress," PLOS ONE, Public Library of Science, vol. 16(1), pages 1-14, January.
    • Handle: RePEc:plo:pone00:0245505
    DOI: 10.1371/journal.pone.0245505
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    1. Gordana Tamindžić & Maja Ignjatov & Dragana Miljaković & Janko Červenski & Dragana Milošević & Zorica Nikolić & Sanja Vasiljević, 2023. "Seed Priming Treatments to Improve Heat Stress Tolerance of Garden Pea ( Pisum sativum L.)," Agriculture, MDPI, vol. 13(2), pages 1-15, February.
    2. Kaveney, Brooke & Barrett-Lennard, Edward & Chau Minh, Khoi & Dang Duy, Minh & Nguyen Thi, Kim Phuong & Kristiansen, Paul & Orgill, Susan & Stewart-Koster, Ben & Condon, Jason, 2023. "Inland dry season saline intrusion in the Vietnamese Mekong River Delta is driving the identification and implementation of alternative crops to rice," Agricultural Systems, Elsevier, vol. 207(C).
    3. Nazir Ahmed & Mingyuan Zhu & Qiuxia Li & Xilei Wang & Jiachi Wan & Yushi Zhang, 2021. "Glycine Betaine-Mediated Root Priming Improves Water Stress Tolerance in Wheat ( Triticum aestivum L.)," Agriculture, MDPI, vol. 11(11), pages 1-17, November.
    4. M. Denizhan Ulusan, 2022. "Responses of the germination and phytochemical content of Pinus nigra Arn. subsp. pallasiana (Lamb.) Holmboe. (Anatolian black pine) seeds to salt stress," Journal of Forest Science, Czech Academy of Agricultural Sciences, vol. 68(9), pages 365-375.

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