Widespread paleopolyploidy in model plant species inferred from age distributions of duplicate genes.

Two ancient rounds of polyploidy in rice genome.

An ancient genome duplication (PPP1) that predates divergence of the cereals has recently been recognized. We report here another potentially older large-scale duplication (PPP2) event that predates monocot-dicot divergence in the genome of rice (Oryza sativa L.), as inferred from the age distribution of pairs of duplicate genes based on recent genome data for rice. Our results suggest that pal...

Multiple paleopolyploidizations during the evolution of the Compositae reveal parallel patterns of duplicate gene retention after millions of years.

Of the approximately 250,000 species of flowering plants, nearly one in ten are members of the Compositae (Asteraceae), a diverse family found in almost every habitat on all continents except Antarctica. With an origin in the mid Eocene, the Compositae is also a relatively young family with remarkable diversifications during the last 40 My. Previous cytologic and systematic investigations sugge...

Two genomes are better than one: widespread paleopolyploidy in plants and evolutionary effects.

Whole genome duplication in coast redwood (Sequoia sempervirens) and its implications for explaining the rarity of polyploidy in conifers.

Polyploidy is common and an important evolutionary factor in most land plant lineages, but it is rare in gymnosperms. Coast redwood (Sequoia sempervirens) is one of just two polyploid conifer species and the only hexaploid. Evidence from fossil guard cell size suggests that polyploidy in Sequoia dates to the Eocene. Numerous hypotheses about the mechanism of polyploidy and parental genome donor...

The consequences of gene and genome duplication in plants.

www.sciencedirect.com The plant community has long suspected that at least some plant genomes have an abundance of duplicate genes. In the pre-genomic era, studies of duplicate genes were restricted to a few plant species in which duplication events could be easily recognized. The notion that maize is the product of an ancient polyploidization event was supported, in part, by the analysis of ge...