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<p>The restoration of degraded saline areas with native species is crucial because of their adaptability and role in providing ecosystem services. Understanding germination characteristics under salt and drought stress is essential, especially with anticipated stress increases due to climate change. The present study investigated the species-specific variation in seed germination responses under light-dark cycles and osmotic stress induced by NaCl and polyethylene glycol (PEG). The results revealed distinct patterns across species. For example, <i>Haloxylon salicornicum</i> exhibited reduced germination under light-dark cycles and full darkness, with notable sensitivity to NaCl and PEG, positive photoblastism, and osmotic stress-induced modulation of the mean germination time (MGT) and germination synchrony (SYN). Other species presented differential responses to light‒dark cycles and salinity, with evidence of neutral to negative photoblastism and moderate osmotic stress sensitivity. Therefore, <i>Zygophyllum qatarensis</i> showed moderate germination under light and darkness, emphasizing osmotic stress sensitivity, particularly in darkness. Regression analyses highlighted correlations between germination conditions and seed morphological traits, emphasizing species-specific adaptations to environmental cues. Overall, this study underscores the intricate interplay between environmental factors and seed germination strategies across diverse plant species.</p>

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Effects of salt and osmotic stresses on seed germination in coastal species: implications for coastal restoration

  • 期刊论文

  • 发表日期：

    2025年11月12日

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  • Arvind Bhatt,
  • Samuel Giovanny García-Castaño,
  • Andrés José Betin Ruiz,
  • Marcelo F. Pompelli

摘要

The restoration of degraded saline areas with native species is crucial because of their adaptability and role in providing ecosystem services. Understanding germination characteristics under salt and drought stress is essential, especially with anticipated stress increases due to climate change. The present study investigated the species-specific variation in seed germination responses under light-dark cycles and osmotic stress induced by NaCl and polyethylene glycol (PEG). The results revealed distinct patterns across species. For example, Haloxylon salicornicum exhibited reduced germination under light-dark cycles and full darkness, with notable sensitivity to NaCl and PEG, positive photoblastism, and osmotic stress-induced modulation of the mean germination time (MGT) and germination synchrony (SYN). Other species presented differential responses to light‒dark cycles and salinity, with evidence of neutral to negative photoblastism and moderate osmotic stress sensitivity. Therefore, Zygophyllum qatarensis showed moderate germination under light and darkness, emphasizing osmotic stress sensitivity, particularly in darkness. Regression analyses highlighted correlations between germination conditions and seed morphological traits, emphasizing species-specific adaptations to environmental cues. Overall, this study underscores the intricate interplay between environmental factors and seed germination strategies across diverse plant species.