Genetic interaction between two unlinked loci underlies the loss of self-incompatibility in Arabidopsis lyrata

摘要: As the first step towards evolution of selfing from obligate outcrossing, identifying key mutations underlying loss self-incompatibility is particular interest. However, our current knowledge primarily based on sequence-based comparisons between species and their self-incompatible relatives, which makes it hard to distinguish causal secondary mutations. To by-pass this problem, we inferred genetic basis by intercrossing plants twelve geographically interspersed outcrossing populations North-American Arabidopsis lyrata determining breeding system 1,607 progeny. Self-incompatibility was not restored after crosses different self-compatible populations. Equal frequencies progeny emerged parents with systems. We propose a two-locus model for in specific S-locus haplotypes (S1 S19) are associated through interaction an unlinked modifier.