Scholarlink

<p>Both seed dormancy and germination are important phases in plants’ life cycle, affected by a fragile balance of hormonal signals, environmental conditions, and reactive oxygen species (ROS). Earlier considered as harmful byproducts of metabolism, ROS are now recognized as necessary regulators of seed physiology, acting as both signalling molecules and modulators of oxidative stress. Initially, during seed development, ROS are produced through mitochondrial respiration, photosynthesis, and fatty acid metabolism, whereas in mature dry seeds, non-enzymatic reactions viz., lipid peroxidation and Maillard reactions are main sources. During seed germination, ROS production increases, especially <sub>H2O2</sub>, driven by NADPH oxidase activity, mitochondrial reactivation and various enzyme-catalysed reactions. This controlled ROS production drives vital developmental steps during germination, including cell wall weakening, radicle protrusion, and metabolic reactivation, allowing the seed to break dormancy and initiate germination. Reactive oxygen is also essential in hormonal crosstalk, lowering ABA and increasing GA signalling via oxidative modification of DELLA proteins. Beside this, ROS also affects ethylene production, which endorses endosperm weakening and radicle emergence, while amplifying the activity of transcription factors, cytoskeletal dynamics, and regulating protein degradation important for cellular reprogramming amid germination. The “oxidative window” concept stresses the necessity for maintaining optimal ROS concentration, as both extreme and inadequate ROS can curb seed germination. This review highlights the tangled regulatory pathways controlling ROS production and its hormonal crosstalk during seed dormancy release and germination. By expanding our comprehension of these regulatory pathways, tactics can be developed to increase seed vigour, germination and crop yield under a wide range of environmental conditions. The essential task of ROS as principal mediators in seed physiological processes opens pathway for innovative agricultural techniques that can tackle global issues such as food security and climate resilience.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Oxidative Signalling in Seed Dormancy Release and Germination: The Role of Reactive Oxygen Species

  • 期刊论文

  • 发表日期：

    2026年5月27日

查看全文
  • Mohammad Amir,
  • Rubby Sandhu,
  • Farooq Ahmad Khan,
  • Moinuddin,
  • Belal Ahmad

摘要

Both seed dormancy and germination are important phases in plants’ life cycle, affected by a fragile balance of hormonal signals, environmental conditions, and reactive oxygen species (ROS). Earlier considered as harmful byproducts of metabolism, ROS are now recognized as necessary regulators of seed physiology, acting as both signalling molecules and modulators of oxidative stress. Initially, during seed development, ROS are produced through mitochondrial respiration, photosynthesis, and fatty acid metabolism, whereas in mature dry seeds, non-enzymatic reactions viz., lipid peroxidation and Maillard reactions are main sources. During seed germination, ROS production increases, especially H2O2, driven by NADPH oxidase activity, mitochondrial reactivation and various enzyme-catalysed reactions. This controlled ROS production drives vital developmental steps during germination, including cell wall weakening, radicle protrusion, and metabolic reactivation, allowing the seed to break dormancy and initiate germination. Reactive oxygen is also essential in hormonal crosstalk, lowering ABA and increasing GA signalling via oxidative modification of DELLA proteins. Beside this, ROS also affects ethylene production, which endorses endosperm weakening and radicle emergence, while amplifying the activity of transcription factors, cytoskeletal dynamics, and regulating protein degradation important for cellular reprogramming amid germination. The “oxidative window” concept stresses the necessity for maintaining optimal ROS concentration, as both extreme and inadequate ROS can curb seed germination. This review highlights the tangled regulatory pathways controlling ROS production and its hormonal crosstalk during seed dormancy release and germination. By expanding our comprehension of these regulatory pathways, tactics can be developed to increase seed vigour, germination and crop yield under a wide range of environmental conditions. The essential task of ROS as principal mediators in seed physiological processes opens pathway for innovative agricultural techniques that can tackle global issues such as food security and climate resilience.