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Related Concept Videos

Adaptations that Reduce Water Loss01:57

Adaptations that Reduce Water Loss

Though evaporation from plant leaves drives transpiration, it also results in loss of water. Because water is critical for photosynthetic reactions and other cellular processes, evolutionary pressures on plants in different environments have driven the acquisition of adaptations that reduce water loss.
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Regulation of Transpiration by Stomata

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Responses to Drought and Flooding

Water plays a significant role in the life cycle of plants. However, insufficient or excess of water can be detrimental and pose a serious threat to plants.

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Related Experiment Video

Updated: Jun 22, 2026

Preparation of Intact Tissue for Microscopic Analysis of the Endosperm Cell Layer in Developing and Mature Arabidopsis Seeds
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Nitric oxide-induced rapid decrease of abscisic acid concentration is required in breaking seed dormancy in

Yinggao Liu1, Lin Shi1, Nenghui Ye1

  • 1Department of Biology, Hong Kong Baptist University, Hong Kong, China.

The New Phytologist
|June 16, 2009
PubMed
Summary

Nitric oxide (NO) rapidly decreases abscisic acid (ABA) levels, a key step for breaking seed dormancy. This NO-induced ABA reduction is mediated by CYP707A2, essential for seed germination.

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Area of Science:

  • Plant Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Nitric oxide (NO) is implicated in seed dormancy but its precise role remains elusive.
  • Abscisic acid (ABA) is a key hormone regulating seed dormancy and germination.

Purpose of the Study:

  • To elucidate the mechanism by which nitric oxide (NO) breaks seed dormancy in Arabidopsis.
  • To investigate the relationship between NO accumulation and abscisic acid (ABA) levels during seed germination.

Main Methods:

  • Quantitative real-time polymerase chain reaction (QRT-PCR) to analyze gene expression.
  • Western blotting to assess protein levels.
  • Analysis of Arabidopsis mutants (cyp707a1, cyp707a2, cyp707a3).
  • Fluorescent imaging to visualize NO release.

Main Results:

  • Rapid NO accumulation led to a swift decrease in ABA levels, which was crucial for dormancy release.
  • NO-induced ABA reduction correlated with the regulation of CYP707A2 transcription and protein expression.
  • CYP707A2 was identified as a major enzyme in ABA catabolism during early imbibition.
  • NO was rapidly released in the endosperm layer during imbibition, preceding enhanced ABA catabolism.

Conclusions:

  • Nitric oxide (NO) acts by rapidly reducing abscisic acid (ABA) levels through the regulation of CYP707A2.
  • CYP707A2-mediated ABA catabolism is essential for NO-induced seed germination.
  • NO release in the endosperm layer is an early event that triggers the ABA degradation pathway, facilitating seed germination.