Dating the origins of polyploidy events Free sex chat in darwin

Legumes are the third largest family of flowering plants, with over 700 genera and more than 19,000 species.

Genomic evidence has shown that a whole-genome duplication (WGD) occurred shortly after the origin of the family, in an ancestor that gave rise to the papilionoids, the clade that comprises 65 % of the genera and 71 % of the species, including nearly all of the economically important crop legumes.

The purpose of the present study is to use six nuclear orthologs, within 54 accessions of 11 polyploid species, 34 accessions of 29 diploid species of section Petota representing their putative progenitors, and two outgroups, to see if phenomena typical of other polyploid groups occur within wild potatoes, to include multiple origins, loss of alleles, or gain of new alleles. moscopanum, the results give much better resolution of species-specific progenitors. These studies have been limited, however, by the use of few accessions per polyploid species and by low taxonomic resolution, providing clade-specific, but not species-specific origins within clades.

RESULTS: Our results increase resolution within clades, giving better ideas of diploid progenitors, and show unexpected complexity of allele sharing within clades. Seven other species, however, show variant patterns of allele distributions suggesting multiple origins and allele loss. The purpose of the present study is to use six nuclear orthologs, within 54 accessions of 11 polyploid species, 34 accessions of 29 diploid species of section representing their putative progenitors, and two outgroups, to see if phenomena typical of other polyploid groups occur within wild potatoes, to include multiple origins, loss of alleles, or gain of new alleles.

More recent polyploidy, as inferred from chromosome counts, occurs in approximately a quarter of all legume genera for which data are available.

In most cases, polyploidy is confined to individual genera, species within genera, or cytotypes within species.

Allopolyploidy was not accompanied by substantial restructuring of the parental genomes, as observed in some other allopolyploid systems.

The major evolutionary events affect the regulatory systems controlling gene expression (including epigenetic regulation), which appear to have been profoundly altered by the merger of different genomes.

These studies have been limited, however, by the use of few accessions per polyploid species and by low taxonomic resolution, providing clade-specific, but not species-specific origins within clades. Two separate studies using the nuclear orthologs GBSSI and nitrate reductase confirmed prior hypotheses of polyploid origins in potato and have shown new origins not proposed before.Postdoc Brian Coyle was part of a team that recently found a way to recycle #5 plastic consumables (tip boxes, etc.) from the molecular lab.Recently, they delivered 450 lbs of plastic to Whole Foods for recycling through Preserve‘s GIMME 5 program!The team made it into a recent issue of the SI Sustainability newsletter.Many major clades of angiosperms have several whole genome duplications (polyploidization events) in their distant past, suggesting that polyploidy drives or at least permits diversification.

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