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Jeans, Genes, and Genomes: Cotton as a Model for Studying Polyploidy

  • Jonathan F. Wendel
  • Lex E. Flagel
  • Keith L. Adams
Chapter

Abstract

We present an overview of the cotton genus (Gossypium) as a model for the study of polyploidy. A synopsis of the origin and evolution of polyploid cotton is provided, offering an organismal framework and phylogenetic perspective that is critical for understanding modes and mechanisms of gene and genome evolution. Sequence data from thousands of genes implicate a mid-Pleistocene (1–2 mya) origin of polyploid cotton, following trans-oceanic dispersal of an Old World, A-genome diploid to the New World and subsequent hybridization with an indigenous D-genome diploid. This chance biological reunion, occurring after 5–10 million years of diploid evolution in isolation, has led to an array of molecular genetic interactions in the newly formed allopolyploid lineage, including nonreciprocal homoeologous recombination and perhaps other forms of interlocus concerted evolution, differential rates of genomic evolution, intergenomic spread of transposable elements, and myriad forms of alterations in duplicate expression relative to that experienced in the ancestral diploids. The latter include developmental, organ-, tissue-, and cell-specific biases in homoeologous gene expression, which can be sensitive to various forms of environmental perturbation and stress. The allopolyploid Gossypium transcriptome is exceptionally dynamic, with homoeolog expression ratios being subject to change even during development of the single-celled cotton fiber. Expression evolution is temporally partitioned into changes accompanying genome merger (hybridization) at the diploid level, polyploidization, and longer term evolution at the allopolyploid level. Evidence indicates that allopolyploidy facilitated colonization of a new ecological niche for the genus and led to an enhanced capacity for developing agronomically superior cotton varieties. The myriad mechanisms that underlie genomic and regulatory evolution are suggested to have contributed to both ecological success and agronomic potential.

Keywords

Cotton Fiber Development Allopolyploid Species Polyploid Formation Synthetic Allopolyploid Natural Allopolyploid 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

Research in the Wendel lab has largely been funded by the NSF Plant Genome Program, with additional support from other NSF programs, the USDA NRI, and Cotton Incorporated. Research in the Adams lab has been supported by the Natural Science and Engineering Research Council of Canada and by the USDA NRI program. We gratefully acknowledge all of these sources of support.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2012

Authors and Affiliations

  • Jonathan F. Wendel
    • 1
  • Lex E. Flagel
    • 2
  • Keith L. Adams
    • 3
  1. 1.Department of Ecology, Evolution, and Organismal BiologyIowa State UniversityAmesUSA
  2. 2.Department of BiologyDuke UniversityDurhamUSA
  3. 3.Department of Botany, and UBC Botanical Garden and Centre for Plant ResearchUniversity of British ColumbiaVancouverCanada

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