Segregation Models for Disomic, Tetrasomic and Intermediate Inheritance in Tetraploids: A General Procedure Applied to Rorippa (Yellow Cress) Microsatellite Data

• DOI: 10.1534/genetics.107.085027
• Publication Date: 2008-08-10T00:34:39Z
• Authors: Marc Stift; Camillo Berenos; Peter Kuperus; Peter H van Tiend...
• Keywords: Inheritance

Abstract Tetraploid inheritance has two extremes: disomic in allotetraploids and tetrasomic autotetraploids. The possibility of mixed, or intermediate, models generally been neglected. These could well apply to newly formed hybrids diploidizing (auto)tetraploids. We present a simple likelihood-based approach that is able incorporate disomic, tetrasomic, intermediate estimates the double-reduction rate. Our model shows microsatellite markers natural tetraploids Rorippa amphibia R. sylvestris confirming their autotetraploid origin. However, F1 was inheritance. Apparently, meiosis, chromosomes paired preferentially with homolog from same parental species, but not strictly so. Detected rates were low. tested general applicability our model, using published segregation data. In cases, an gave better fit data than advocated by authors. existence important implications for linkage mapping population genetics hence breeding programs tetraploids. Methods have developed either may be applicable, particularly systems where hybridization common.