Polyploidy. Part 5: Patterns of Autopolyploidy

switchgrass, Panicum virgatum, famous autopolyploid

Polyploidy is whole genome duplication, uncommon in animals, but common in plant evolution, between living plant species and in individuals within plant species. (See previous blogs link). Although it is actually a continuum, botanists recognize allopolyploidy, when the genomes that duplicated come from two different species and autopolyploidy when a single genome doubles. This post is about autopolyploids.

Polyploidy 4. Distribution of Autopolyploidy

Polyploidy is whole genome duplication, a genetic phenomenon which is widespread in plants and uncommon in animals. The ancestry of most if not all plants includes a doubling of all the chromosomes. In addition, many plant species were formed by crossing between two existing species, with subsequent doubling of the genome which made the hybrid fertile. (See previous blogs Intro to Polyploidy, Crop Plant Polyploidy, Speciation via Polyploidy).

 

Long known and still poorly understood is variation in polyploidy within a species. 

fireweed (Chamerion) has within-species polyploidy