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<p>Seeds with the same genetic information from the different parts of the maize ear vary in seed vigor. However, little is known regarding the associated mechanisms. In the present study, we explored the mechanism of maize ear position effects on seed vigor on hormone level and epigenetic modification. The dimethylated histone H3 Lys9 (H3K9me2) level in the seeds at middle sections of the ear was lower at 24 h of imbibition, and decreased more significantly than that of top seeds. Treatments with fluoridone (Flu), an inhibitor of abscisic acid (ABA) synthesis, on seeds at 10 days or 14 days after pollination changed expression level of ABA synthesis- and catabolism-related genes, and ultimately increased the gibberellic acid 4 (GA<sub>4</sub>)/ABA ratio of seeds and influenced seed vigor. 37.5 μmol/L Flu and 75 μmol/L Flu treatments both significantly increased the level of H3K9me2 in seeds by improved expression of H3K9 methyltransferase genes, <i>GRMZM2G300955</i> and <i>GRMZM2G165011</i>. This indicated that H3K9me2 plays an important role in seed vigor regulating. The present study contributes to understanding of the mechanisms underlying GA<sub>4</sub>/ABA ratio and H3K9me2 cooperatively regulating maize seed vigor.</p>

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GA4/ABA Ratio and H3K9me2 Cooperatively Regulate Maize Seed Vigor

  • 期刊论文

  • 发表日期：

    2025年1月24日

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  • Wensi Yang,
  • Longpeng Tian,
  • Yanhong Chen,
  • Jieran Li,
  • Xiyan Liu,
  • Chunqing Zhang,
  • Yan Li

摘要

Seeds with the same genetic information from the different parts of the maize ear vary in seed vigor. However, little is known regarding the associated mechanisms. In the present study, we explored the mechanism of maize ear position effects on seed vigor on hormone level and epigenetic modification. The dimethylated histone H3 Lys9 (H3K9me2) level in the seeds at middle sections of the ear was lower at 24 h of imbibition, and decreased more significantly than that of top seeds. Treatments with fluoridone (Flu), an inhibitor of abscisic acid (ABA) synthesis, on seeds at 10 days or 14 days after pollination changed expression level of ABA synthesis- and catabolism-related genes, and ultimately increased the gibberellic acid 4 (GA4)/ABA ratio of seeds and influenced seed vigor. 37.5 μmol/L Flu and 75 μmol/L Flu treatments both significantly increased the level of H3K9me2 in seeds by improved expression of H3K9 methyltransferase genes, GRMZM2G300955 and GRMZM2G165011. This indicated that H3K9me2 plays an important role in seed vigor regulating. The present study contributes to understanding of the mechanisms underlying GA4/ABA ratio and H3K9me2 cooperatively regulating maize seed vigor.