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Does fire-induced bud mortality reduce phenotypic variability?

Jaime Saiz-Blanco1, Natashi Pilon2, Juli G Pausas1

  • 1Centro de investigaciones sobre Desertificación (CIDE, CSIC-UV-GV). Ctra. CV-315, Km 10.7, Moncada, E-46113 Valencia, Spain.

Annals of Botany
|June 2, 2026
PubMed
Summary
This summary is machine-generated.

Frequent fires reduce plant variability in aerial resprouters by removing poorly protected buds. This contrasts with basal resprouters, showing fire

Keywords:
Aerial resproutingPalicourea rigidabud mortalityleaf phenotypepostfire resproutingstem diametersubindividual variability

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Area of Science:

  • Plant ecology
  • Fire ecology
  • Evolutionary biology

Background:

  • Fire impacts resprouting plants, requiring biomass rebuilding under altered conditions.
  • Aerial resprouters rely on stem buds, potentially filtered by fire for protection.
  • Basal resprouters use protected belowground buds, possibly increasing variability post-fire.

Purpose of the Study:

  • Investigate if frequent low-severity fires act as a phenotypic filter in aerial resprouters.
  • Assess the impact of fire on bud protection and leaf trait variability.
  • Determine how fire history influences phenotypic variation in Palicourea rigida.

Main Methods:

  • Studied Palicourea rigida in the Brazilian Cerrado across populations with different fire histories.
  • Quantified bud mortality, bud protection (stem diameter, height), and leaf traits (area, mass, SLA).
  • Assessed fire-driven changes in phenotypic variability at subindividual and population levels.

Main Results:

  • Bud mortality depended on stem diameter in high fire frequency populations, and bud height in fire-excluded populations.
  • Frequent fires reduced variability in stem diameter and leaf traits at both population and subindividual scales.
  • Frequently burned populations exhibited more conservative leaf traits compared to fire-excluded ones.

Conclusions:

  • Frequent low-severity fires reduce subindividual phenotypic variability in aerial resprouters by selecting for protected buds.
  • Fire's effect on plant variability differs between aerial and basal resprouters, depending on the resprouting strategy and fire regime.
  • Integrating subindividual variability into fire ecology offers insights into disturbance impacts on plant resilience and traits.