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The Evolution of Complex Multicellularity in Land Plants.

Hossein Madhani1, Arsham Nejad Kourki2,3

  • 1School of Life Sciences, University of Nevada Las Vegas, Las Vegas, NV 89154, USA.

Genes
|November 27, 2024
PubMed
Summary

Land plants evolved complex multicellularity through major evolutionary transitions, focusing on structural complexity rather than just formation. This study examines plant evolution using a new framework, highlighting key innovations and distinctions from animal evolution.

Keywords:
evolution of complexityevolutionary transitions in individualityland plant evolutionmajor evolutionary transitionsmulticellularitysexual life cycle

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Area of Science:

  • Evolutionary biology
  • Developmental biology
  • Plant science

Background:

  • Complex multicellularity in land plants is a Major Evolutionary Transition (MET).
  • Evolutionary Transitions in Individuality (ETIs) framework explains how independent entities form higher-level units.
  • Existing research on ETIs focuses on early multicellularity stages (formation, maintenance), neglecting the transformation stage.

Purpose of the Study:

  • To explore the transformation stage of multicellularity in land plants using the Transitions in Structural Complexity (TSC) approach.
  • To examine the role of sex, individuality, and units of selection in ETIs of early land plant evolution.
  • To identify parallels and distinctions between land plant and animal multicellularity evolution.

Main Methods:

  • Applied the Transitions in Structural Complexity (TSC) approach to land plant evolution.
  • Analyzed the sexual life cycle of the unicellular common ancestor of land plants.
  • Examined key evolutionary innovations such as shoot, root, vascular systems, and reproductive structures.

Main Results:

  • The TSC approach offers explanatory unification for the evolution of land plant multicellularity.
  • Key innovations like shoot, root, and vascular systems represent significant steps in structural complexity.
  • Differences in multicellularity transitions between plants and animals were highlighted.

Conclusions:

  • The study provides a novel perspective on land plant multicellularity evolution through the TSC framework.
  • Understanding plant ETIs requires considering structural complexity and sexual life cycles.
  • This research deepens our understanding of evolutionary pathways in the plant kingdom.