Ancient polyploidization predating divergence of the cereals

Soltis et al., 2000, with modifications reflecting more recent analyses, including Jansen et al., 2007), depicting putative locations of genome duplication events now inferred for flowering plants relative to major lineages or species with sequenced nuclear genomes or substantial expressed sequence tag data (taken from Soltis et al., 2009). Unravelling angiosperm genome evolution by phylogenetic analysis of chromosomal duplication events.

Polyploidy has long been recognized as a major force in angiosperm evolution.

The most common approach for identifying ancient polyploidy events is based on interpreting Ks plots (e.g., Blanc and Wolfe, 2004; Cui et al., 2006), which display the distribution of pairwise distances between paralogous genes within a single taxon.

Here, we analyzed the fate of duplicated genes following the ancient whole-genome duplication (WGD) in rice.

By using large collections of ESTs, investigators have been able to propose ancient duplication events for various angiosperm lineages, but the data remain taxonomically sparse.

To increase phylogenetic breadth, we propose that over 550 phylogenetically pivotal angiosperm species and a suite of gymnosperm outgroups be included as part of this initiative. Widespread paleopolyploidy in model plant species 4.

Simplified summary tree for angiosperms (following the general topology of D. Studies suggest that the common ancestor of Poaceae, the grass family which includes important crop species such as maize, rice, wheat, and sugar cane, shared a whole genome duplication about The core eudicots also shared a common whole genome triplication (paleo-hexaploidy), which was estimated to have occurred after monocot-eudicot divergence but before the divergence of rosids and asterids. If your browser does not accept cookies, you cannot view this site.Here, I consider the advantages and challenges of polyploidy, and its evolutionary potential.Paleopolyploidy is the result of genome duplications which occurred at least several million years ago (MYA).Polyploids — organisms that have multiple sets of chromosomes — are common in certain plant and animal taxa, and can be surprisingly stable.

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