Abstract
Cotton has been developed as a particularly useful model system for examining the responses of the genome to polyploidy. Recent studies have provided novel insights and perspectives on genome-wide consequences of polyploidy, as well as the responses of individual genes and effects on gene expression. Comparative BAC sequencing has revealed evidence of genome downsizing in G. hirsutum. Expression studies have shown extensive organ-specific gene silencing and expression changes upon allopolyploidy that continue over evolutionary time. Expression patterns can be partitioned between homoeologous genes such that only one copy is expressed in some organs and only the other copy is expressed in other organs. Abiotic stress can have major effects on the expression of homoeologous genes. Larger scale approaches are starting to be employed that discriminate expression of thousands of homoeologs in a single experiment. An improved understanding of the genomic responses to polyploidy will likely have implications and applications for cotton crop improvement.
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Acknowledgments
We thank a reviewer for helpful comments on the manuscript. Research on cotton genome and gene expression evolution in the Wendel lab has been funded by the NSF Plant Genome and the USDA NRI programs, whose support we gratefully acknowledge.
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Adams, K.L., Flagel, L., Wendel, J.F. (2009). Responses of the Cotton Genome to Polyploidy. In: Paterson, A.H. (eds) Genetics and Genomics of Cotton. Plant Genetics and Genomics: Crops and Models, vol 3. Springer, New York, NY. https://doi.org/10.1007/978-0-387-70810-2_17
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DOI: https://doi.org/10.1007/978-0-387-70810-2_17
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