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<p>Jasmonic acid (JA) and its precursor 12-oxo-phytodienoic acid (OPDA) play a role in the regulation of seed dormancy and germination. Here, we investigated the crosstalk of JA and OPDA in sunflower embryo tissues -embryonic axes and cotyledons- during early imbibition of seeds of dormant and non-dormant inbred lines (B123 and B91, respectively). The analysis of OPDA and JA contents revealed higher levels of these phytohormones in embryonic axes than in cotyledons. During early imbibition, the increase in JA in B91 embryonic axes correlated with a decrease in OPDA in this tissue and a decrease in JA in cotyledons. In addition, the release of seed dormancy of B123 seeds after a dry storage treatment led to an increase in the contents of OPDA and JA in embryonic axes during early imbibition, compared to B123 dormant seeds (0 days post-harvest). These findings suggest that OPDA and JA participate in regulating germination and dormancy release in B123 sunflower seeds during early imbibition. Particularly, a noticeable increase of JA and OPDA in embryonic axes during early imbibition and to reach a certain threshold to trigger germination in sunflower seeds.</p>

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12-Oxo-Phytodienoic Acid and Jasmonic Acid Play an Embryo Tissue-Specific Role in the Germination and Dormancy Release of Sunflower Seeds

  • 期刊论文

  • 发表日期：

    2026年1月6日

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  • Ana Vigliocco,
  • Zoé Del Bel,
  • Juan Alcoba,
  • Andrea Andrade,
  • Sergio Alemano

摘要

Jasmonic acid (JA) and its precursor 12-oxo-phytodienoic acid (OPDA) play a role in the regulation of seed dormancy and germination. Here, we investigated the crosstalk of JA and OPDA in sunflower embryo tissues -embryonic axes and cotyledons- during early imbibition of seeds of dormant and non-dormant inbred lines (B123 and B91, respectively). The analysis of OPDA and JA contents revealed higher levels of these phytohormones in embryonic axes than in cotyledons. During early imbibition, the increase in JA in B91 embryonic axes correlated with a decrease in OPDA in this tissue and a decrease in JA in cotyledons. In addition, the release of seed dormancy of B123 seeds after a dry storage treatment led to an increase in the contents of OPDA and JA in embryonic axes during early imbibition, compared to B123 dormant seeds (0 days post-harvest). These findings suggest that OPDA and JA participate in regulating germination and dormancy release in B123 sunflower seeds during early imbibition. Particularly, a noticeable increase of JA and OPDA in embryonic axes during early imbibition and to reach a certain threshold to trigger germination in sunflower seeds.