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Iowa State University

Plant Sciences

Ecology, Evolution and Organismal Biology Publications

2008

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Duplicate Gene Expression In Allopolyploid Gossypium Reveals Two Temporally Distinct Phases Of Expression Evolution, Lex E. Flagel, Joshua A. Udall, Dan Nettleton, Jonathan F. Wendel Apr 2008

Duplicate Gene Expression In Allopolyploid Gossypium Reveals Two Temporally Distinct Phases Of Expression Evolution, Lex E. Flagel, Joshua A. Udall, Dan Nettleton, Jonathan F. Wendel

Ecology, Evolution and Organismal Biology Publications

Polyploidy has played a prominent role in shaping the genomic architecture of the angiosperms. Through allopolyploidization, several modern Gossypium (cotton) species contain two divergent, although largely redundant genomes. Owing to this redundancy, these genomes can play host to an array of evolutionary processes that act on duplicate genes. We compared homoeolog (genes duplicated by polyploidy) contributions to the transcriptome of a natural allopolyploid and a synthetic interspecific F1 hybrid, both derived from a merger between diploid species from the Gossypium A-genome and D-genome groups. Relative levels of A- and D-genome contributions to the petal transcriptome were determined for 1,383 ...


The Evolution Of Spinnable Cotton Fiber Entailed Prolonged Development And A Novel Metabolism, Ran Hovav, Joshua A. Udall, Bhupendra Chaudhary, Einat Hovav, Lex Flagel, Guanjing Hu, Jonathan F. Wendel Feb 2008

The Evolution Of Spinnable Cotton Fiber Entailed Prolonged Development And A Novel Metabolism, Ran Hovav, Joshua A. Udall, Bhupendra Chaudhary, Einat Hovav, Lex Flagel, Guanjing Hu, Jonathan F. Wendel

Ecology, Evolution and Organismal Biology Publications

A central question in evolutionary biology concerns the developmental processes by which new phenotypes arise. An exceptional example of evolutionary innovation is the single-celled seed trichome in Gossypium (‘‘cotton fiber’’). We have used fiber development in Gossypium as a system to understand how morphology can rapidly evolve. Fiber has undergone considerable morphological changes between the short, tightly adherent fibers of G. longicalyx and the derived long, spinnable fibers of its closest relative, G. herbaceum, which facilitated cotton domestication. We conducted comparative gene expression profiling across a developmental time-course of fibers from G. longicalyx and G. herbaceum using microarrays with ;22 ...