Difference between revisions of "Plant paleopolyploidy"
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[[Image:WGDsinsequencedgenomes.png|thumb|right|600px|Phylogenetic tree of plant species with sequenced genomes, with ancient whole genome duplications marked. Grass species are the only sequenced representatives of the monocot plant lineage, and all published eudicot genomes come from species in the rosid family.]] | [[Image:WGDsinsequencedgenomes.png|thumb|right|600px|Phylogenetic tree of plant species with sequenced genomes, with ancient whole genome duplications marked. Grass species are the only sequenced representatives of the monocot plant lineage, and all published eudicot genomes come from species in the rosid family.]] | ||
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The plant lineage, and specifically angiosperms, have a genomic history of repeated [[whole genome duplication]] events. This pattern of changing their ploidy level (or number of copies of their genome) is something that happens frequently today, and many domesticated crop plants have been selected with various ploidy levels. While the mechanisms are unknown that permit polyploidy is some lineages such as plants, and not as frequently in others such as mammals <ref name=mammal>There is a case of a tetraploid rodent: Gallardo. 2006. [http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6WG1-4JKYTJP-1&_user=10&_rdoc=1&_fmt=&_orig=search&_sort=d&view=c&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=a18e9e7ecd4f6082c8579d751043661d Molecular cytogenetics and allotetraploidy in the red vizcacha rat, ''Tympanoctomys barrerae'' (Rodentia, Octodontidae)] ''Genomics''. 88:2, 214-221. doi:10.1016/j.ygeno.2006.02.010</ref>. | The plant lineage, and specifically angiosperms, have a genomic history of repeated [[whole genome duplication]] events. This pattern of changing their ploidy level (or number of copies of their genome) is something that happens frequently today, and many domesticated crop plants have been selected with various ploidy levels. While the mechanisms are unknown that permit polyploidy is some lineages such as plants, and not as frequently in others such as mammals <ref name=mammal>There is a case of a tetraploid rodent: Gallardo. 2006. [http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6WG1-4JKYTJP-1&_user=10&_rdoc=1&_fmt=&_orig=search&_sort=d&view=c&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=a18e9e7ecd4f6082c8579d751043661d Molecular cytogenetics and allotetraploidy in the red vizcacha rat, ''Tympanoctomys barrerae'' (Rodentia, Octodontidae)] ''Genomics''. 88:2, 214-221. doi:10.1016/j.ygeno.2006.02.010</ref>. | ||
Revision as of 11:55, 9 November 2011
The plant lineage, and specifically angiosperms, have a genomic history of repeated whole genome duplication events. This pattern of changing their ploidy level (or number of copies of their genome) is something that happens frequently today, and many domesticated crop plants have been selected with various ploidy levels. While the mechanisms are unknown that permit polyploidy is some lineages such as plants, and not as frequently in others such as mammals [1].
Identifying and characterizing plant paleopolyploidies is ongoing research. They are identified through whole genome comparisons using a combination of the data derived from genomic structure (e.g. syntenic dotplots) and evolutionary distances (e.g. synonymous mutation rates). As such, detecting these events and determining which lineages share what subset are continually changing. The images presented here represent our views right now, but are subject to change. Events that were previously undetected or missed can suddenly be seen with an improved build of a genome or the the sequencing of a fortuitously placed outgroup.
As new genomes become available, and previous genomes are updated, we will continue to improve these figures.
- ↑ There is a case of a tetraploid rodent: Gallardo. 2006. Molecular cytogenetics and allotetraploidy in the red vizcacha rat, Tympanoctomys barrerae (Rodentia, Octodontidae) Genomics. 88:2, 214-221. doi:10.1016/j.ygeno.2006.02.010
