Breeding systems, hybridization and continuing evolution in Avon Gorge Sorbus.

ABSTRACT:

Background and aims

Interspecific hybridization and polyploidy are key processes in plant evolution and are responsible for ongoing genetic diversification in the genus Sorbus (Rosaceae). The Avon Gorge, Bristol, UK, is a world 'hotspot' for Sorbus diversity and home to diploid sexual species and polyploid apomictic species. This research investigated how mating system variation, hybridization and polyploidy interact to generate this biological diversity.

Methods

Mating systems of diploid, triploid and tetraploid Sorbus taxa were analysed using pollen tube growth and seed set assays from controlled pollinations, and parent-offspring genotyping of progeny from open and manual pollinations.

Key results

Diploid Sorbus are outcrossing and self-incompatible (SI). Triploid

SUBMITTER: Ludwig S 

PROVIDER: S-EPMC3605949 | biostudies-literature | 2013 Apr

REPOSITORIES: biostudies-literature