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Tempo and mode in plant breeding system evolution.

Emma E Goldberg1, Boris Igić

  • 1Department of Biological Sciences, University of Illinois at Chicago, 840 West Taylor Street MC067, Chicago, Illinois 60607, USA. eeg@uic.edu

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|December 5, 2012
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Self-incompatibility is lost primarily through speciation events, not within species. This finding impacts understanding plant trait evolution and phylogenetic analyses.

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Area of Science:

  • Evolutionary Biology
  • Plant Reproductive Biology

Background:

  • Plant breeding systems, specifically transitions between self-incompatibility and self-compatibility, are central to understanding trait evolution and lineage diversification.
  • These transitions can occur within species (anagenetic) or during speciation (cladogenetic).

Purpose of the Study:

  • To quantify the contributions of anagenetic and cladogenetic modes to breeding system evolution in the Solanaceae family.
  • To analyze the tempo of breeding system change, speciation, and extinction.
  • To assess the impact of cladogenetic change on phylogenetic tests of evolutionary irreversibility.

Main Methods:

  • Application of a novel phylogenetic model to the Solanaceae family.
  • Quantification of evolutionary modes (anagenetic vs. cladogenetic) for breeding system transitions.
  • Analysis of shared polymorphism at the self-incompatibility locus.

Main Results:

  • Loss of self-incompatibility predominantly occurs via the cladogenetic mode.
  • Self-compatible species more frequently originate from isolated, newly self-compatible populations.
  • Self-incompatibility is confirmed as an ancestral trait in Solanaceae, not regained.
  • Ignoring cladogenetic change can lead to erroneous conclusions in phylogenetic tests.

Conclusions:

  • Cladogenetic evolution is the primary driver for the loss of self-incompatibility in the Solanaceae.
  • Accurate phylogenetic modeling must account for cladogenetic character evolution to avoid misinterpreting evolutionary patterns.
  • The study highlights the importance of considering speciation events in the evolution of plant reproductive systems.