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Postzygotic isolation varies by ploidy level within a polyploid complex.

Brittany L Sutherland1, Laura F Galloway1

  • 1Department of Biology, University of Virginia, Charlottesville, VA, 22904-4328, USA.

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Summary
This summary is machine-generated.

Whole genome duplication drives speciation, but reproductive isolation isn't always complete. This study shows weaker isolation between higher polyploid cytotypes, allowing gene flow and potentially slowing divergence.

Keywords:
cytotypehexaploidpolyploid complexpolyploidypostzygoticreproductive isolationtetraploid

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Area of Science:

  • Plant evolutionary biology
  • Genetics and genomics
  • Speciation research

Background:

  • Whole genome duplication (WGD) is a key driver of angiosperm speciation.
  • Rapid, strong interploid reproductive isolation is thought to result from WGD.
  • Recent studies suggest incomplete reproductive isolation, particularly in higher-order polyploids.

Purpose of the Study:

  • To investigate postzygotic reproductive isolation among three cytotypes within a polyploid complex.
  • To assess the role of interploid gene flow in polyploid speciation.
  • To compare reproductive isolation levels between diploid-tetraploid and tetraploid-hexaploid crosses.

Main Methods:

  • Reciprocal crosses were performed between diploid, tetraploid, and hexaploid populations of the Campanula rotundifolia complex.
  • Fruit set, seed number, germination proportion, and pollen viability were measured.
  • Postzygotic isolation was calculated using fitness components; offspring were cytotyped via flow cytometry.

Main Results:

  • Postzygotic isolation was significantly lower in tetraploid-hexaploid crosses compared to diploid-tetraploid crosses.
  • Higher germination rates were observed in tetraploid-hexaploid crosses.
  • Tetraploid-hexaploid crosses yielded pentaploids, while diploid-tetraploid crosses produced triploids and tetraploids.

Conclusions:

  • Incomplete postzygotic isolation exists among higher-order polyploids.
  • Gene flow between polyploid cytotypes is facilitated by weaker isolation.
  • This ongoing interploid gene flow may impede divergence and speciation in polyploid complexes.