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<p>In the plant life cycle, seed germination is a crucial phase that directly affects the establishment of seedlings and their yield potential. In this study, we demonstrate that the <i>OsPsbS1</i> gene, encoding the rice photosystem II subunit S, has a significant role in seed germination regulation. <i>Ospsbs1</i> mutant seeds demonstrated a greater sensitivity to abscisic acid (ABA) applied externally and exhibited reduced seed vigor. Further analysis revealed that <i>Ospsbs1</i> mutants accumulated higher levels of ABA due to the upregulation of ABA biosynthetic genes. In contrast, these mutants showed lower levels of gibberellins (GAs) throughout seed development and imbibition, as a result of the downregulation of genes associated with the biosynthesis of bioactive GAs. Additionally, hydrogen peroxide levels were markedly elevated in the imbibed seeds of <i>Ospsbs1</i> mutants in comparison to wild type. Transcriptomic analysis of germinating seeds showed that <i>OsPsbS1</i> regulates several biological processes, especially in H<sub>2</sub>O<sub>2</sub> peroxide catabolic process. Overall, the regulation of seed germination by <i>OsPsbS1</i> is largely due to its coordination of phytohormone signaling and H<sub>2</sub>O<sub>2</sub> homeostasis. These findings enhance our insight into the molecular genetic bases for delayed seed germination in rice.</p>

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OsPsbS1 Regulates Rice Seed Germination by Mediating Phytohormone Signaling and H2O2 Homeostasis

  • 期刊论文

  • 发表日期：

    2026年4月28日

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  • Quanxiu Wang,
  • Jiaoyan Gao,
  • Haolin Gao,
  • Zijin Chen,
  • Xiujie Li,
  • Hui Lu,
  • Haiyan Zhu,
  • Yuting Shen,
  • Wei Zhou,
  • Jinhui Zhao,
  • Bo Peng

摘要

In the plant life cycle, seed germination is a crucial phase that directly affects the establishment of seedlings and their yield potential. In this study, we demonstrate that the OsPsbS1 gene, encoding the rice photosystem II subunit S, has a significant role in seed germination regulation. Ospsbs1 mutant seeds demonstrated a greater sensitivity to abscisic acid (ABA) applied externally and exhibited reduced seed vigor. Further analysis revealed that Ospsbs1 mutants accumulated higher levels of ABA due to the upregulation of ABA biosynthetic genes. In contrast, these mutants showed lower levels of gibberellins (GAs) throughout seed development and imbibition, as a result of the downregulation of genes associated with the biosynthesis of bioactive GAs. Additionally, hydrogen peroxide levels were markedly elevated in the imbibed seeds of Ospsbs1 mutants in comparison to wild type. Transcriptomic analysis of germinating seeds showed that OsPsbS1 regulates several biological processes, especially in H2O2 peroxide catabolic process. Overall, the regulation of seed germination by OsPsbS1 is largely due to its coordination of phytohormone signaling and H2O2 homeostasis. These findings enhance our insight into the molecular genetic bases for delayed seed germination in rice.