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Area of Science:

  • Plant reproductive biology
  • Environmental stress physiology

Background:

  • Pollen is highly sensitive to temperature, affecting plant reproduction.
  • Pollen temperature limits (PTLs) are critical but poorly understood.
  • Drivers of PTL variability across species are largely unknown.

Purpose of the Study:

  • To analyze pollen temperature limits (PTLs) across 191 species.
  • To correlate PTLs with vegetative tissue thermotolerance.
  • To assess variability in PTLs based on phylogeny, climate, and plant traits.

Main Methods:

  • Examined pollen temperature limits (Tmin, Topt, Tmax) across 191 diverse species.
  • Correlated PTLs with leaf and stem thermotolerance.
  • Utilized phylogenetic analysis and climate data to identify PTL drivers.

Main Results:

  • PTLs varied widely (9.0–42.4°C); vegetative tissues were more tolerant than pollen.
  • Weak correlation between PTLs and leaf temperature tolerance; pollen heat tolerance was independent.
  • Climate significantly influenced pollen cold tolerance; herbaceous plants showed higher heat tolerance.

Conclusions:

  • Pollen temperature tolerance is influenced by climate and plant functional traits.
  • Phylogenetic relatedness shows conserved PTLs at the family level.
  • Findings offer insights into plant reproductive resilience under climate change.