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Related Experiment Videos

Compound pollen cone in a Paleozoic conifer.

G R Hernandez-Castillo1, G W Rothwell, G Mapes

  • 1Department of Biological Sciences, University of Alberta, Edmonton, Alberta, Canada T6G 2E9.

American Journal of Botany
|June 19, 2001
PubMed
Summary

Fossil conifer pollen cones from ancient North America reveal a unique compound structure, challenging previous ideas about conifer evolution. This discovery supports a close relationship between Coniferales and Gnetales.

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Area of Science:

  • Paleobotany
  • Evolutionary Biology
  • Phylogenetics

Background:

  • Pennsylvanian age fossil deposits provide insights into early plant life.
  • Conifer reproductive structures have diverse evolutionary histories.
  • Phylogenetic relationships among seed plants are debated, with conflicting morphological and molecular data.

Purpose of the Study:

  • To describe a novel compound pollen cone from a Pennsylvanian conifer.
  • To investigate the evolutionary implications of this fossil for conifer and gnetophyte relationships.
  • To reconcile conflicting data in seed plant systematics.

Main Methods:

  • Detailed morphological analysis of fossil specimens.
  • Comparison with extant and fossil conifer and gnetophyte reproductive structures.

Related Experiment Videos

  • Integration of fossil evidence with molecular phylogenetic data.

    • Main Results:

    • Identification of numerous vegetative and fertile specimens of a primitive walchian conifer.
    • Description of a unique compound pollen cone with helically arranged bracts and axillary fertile dwarf shoots.
    • Pollen identified as Potonieisporites Bhardwaj, with monosaccate structure.

    Conclusions:

    • The discovered pollen cone represents a compound shoot system, distinct from simple conifer pollen cones.
    • This fossil provides strong support for a close evolutionary relationship between Coniferales and Gnetales.
    • The findings help bridge the gap between morphological and molecular data in seed plant phylogeny.