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Reproductive isolation during domestication.

Hannes Dempewolf1, Kathryn A Hodgins, Sonja E Rummell

  • 1Department of Botany and Biodiversity Research Centre, University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada.

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Reproductive isolation barriers are common between crops and their wild relatives, suggesting they play a key role in domestication. These barriers may be considered a "domestication trait" facilitating crop evolution.

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Area of Science:

  • * Evolutionary Biology
  • * Plant Science
  • * Agricultural Science

Background:

  • * Reproductive isolation is hypothesized to facilitate evolution under domestication.
  • * A systematic comparison of reproductive barrier strength between crops and their progenitors is lacking.
  • * Understanding these barriers is crucial for comprehending the domestication process.

Purpose of the Study:

  • * To systematically survey reproductive barriers between 32 crop species and their progenitors.
  • * To test the hypothesis that reproductive isolation facilitates domestication.
  • * To explore the role of reproductive isolation in the domestication process.

Main Methods:

  • * Conducted a systematic survey of reproductive barriers between 32 economically important crop species and their progenitors.
  • * Focused on well-characterized reproductive isolation mechanisms, excluding factors like flowering time differences.
  • * Assessed the presence and strength of various reproductive barriers.

Main Results:

  • * The majority of surveyed crops exhibit one or more reproductive barriers separating them from their progenitors.
  • * Geographical isolation, a major barrier in natural systems, was absent in the early stages of domestication for most species.
  • * Observed barriers include polyploidy and uniparental reproduction.

Conclusions:

  • * Barriers to reproduction between crops and wild relatives are strongly associated with domestication and likely facilitate it.
  • * Reproductive isolation can be considered a significant, yet overlooked,
  • domestication trait.
  • * Certain reproductive barriers may have been selected for reasons beyond their impact on gene flow, such as polyploidy or uniparental reproduction.