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A model for chloroplast capture.

Anne Tsitrone1, Mark Kirkpatrick, Donald A Levin

  • 1Section of Integrative Biology C0930, University of Texas, Austin, Texas 78712, USA. Haya-Anne.Tsitrone@ensam.inra.fr

Evolution; International Journal of Organic Evolution
|September 25, 2003
PubMed
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Chloroplast capture, the transfer of chloroplasts between plant species, can occur under broader conditions than previously thought. Genetic modeling reveals that advantages in seed production, especially with cytonuclear incompatibilities, promote this phenomenon.

Area of Science:

  • Evolutionary Biology
  • Plant Genetics
  • Molecular Evolution

Background:

  • Inconsistencies between nuclear and cytoplasmic gene trees in plants are often attributed to chloroplast capture.
  • Chloroplast capture involves the introgression of a chloroplast from one species into another.

Purpose of the Study:

  • To genetically model the conditions under which chloroplast capture occurs.
  • To determine if these conditions are more general than previously proposed.

Main Methods:

  • Development and analysis of a genetic model simulating interspecific hybridization and introgression.
  • Evaluation of factors influencing chloroplast capture, including cytoplasmic advantage and genetic incompatibilities.

Main Results:

Related Experiment Videos

  • Chloroplast capture can occur under more general conditions than previously suggested by verbal arguments.
  • Cytoplasm substitution providing seed production advantages is a key driver.
  • Nuclear incompatibilities and partial selfing, especially with strong inbreeding depression, promote capture.

Conclusions:

  • The genetic model provides a more comprehensive understanding of chloroplast capture mechanisms.
  • Empirical predictions are discussed for testing the proposed conditions of chloroplast capture in natural populations.