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Fire and seed dormancy: a global meta-analysis.

Zahra Monemizadeh1, Asieh Siahmarguee1, Elias Soltani2

  • 1Department of Agronomy, University of Agricultural Sciences and Natural Resources, Gorgan, Iran.

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|December 27, 2024
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Summary

Seed dormancy (SD) release by fire is more common in fire-prone regions, especially under crown fires. Heat and smoke cues interact synergistically to break SD, with KAR1 being the most effective smoke compound.

Keywords:
Ecosystem responses to firefire regimefire-released seed dormancygerminationheat-shockkarrikinolideseed dormancysmoke

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Area of Science:

  • Ecology
  • Plant Science
  • Fire Ecology

Background:

  • Seed dormancy (SD) is crucial for plant survival in fire-prone ecosystems.
  • Local studies show fire cues like heat and smoke influence SD, but global patterns are unknown.

Purpose of the Study:

  • To conduct a global quantitative analysis of fire-released SD.
  • To test if fire-released SD is more prevalent in fire-prone and crown-fire ecosystems.
  • To identify global patterns in fire cue interactions with SD classes.

Main Methods:

  • A meta-analysis of 246 germination studies (1970-2022) covering 1782 species.
  • Analysis of moderators including fire cues, smoke application, duration, concentration, compounds, fire-proneness, fire regimes, and ecosystem types.

Main Results:

  • Heat primarily releases physical SD, while smoke releases physiological and morphophysiological SD.
  • Heat and smoke act synergistically for SD release; KAR1 is the most effective smoke compound.
  • Fire-released SD is more prevalent in fire-prone regions and crown-fire regimes, common in Mediterranean and temperate dry/warm ecosystems.

Conclusions:

  • Fire regimes significantly shape global SD and germination patterns.
  • Synergistic effects of heat and smoke reveal complex fire cue interactions.
  • Understanding these patterns is vital for conservation and restoration amid climate-driven fire regime shifts.