Chlorosis caused by two recessively interacting genes reveals a role of RNA helicase in hybrid breakdown in Arabidopsis thaliana

摘要: Hybrids often differ in fitness from their parents. They may be superior, translating into hybrid vigour or heterosis, but they also markedly inferior, because of weakness incompatibility. The underlying genetic causes for the latter can traced back to genes that evolve rapidly sexual host-pathogen conflicts. Hybrid manifest itself only later generations, a phenomenon called breakdown. We have characterized case breakdown among two Arabidopsis thaliana accessions, Shahdara (Sha, Tajikistan) and Lovvik-5 (Lov-5, Northern Sweden). In addition chlorosis, fraction F2 plants defects leaf embryo development, reduced photosynthetic efficiency. chlorosis is due major-effect loci, which one, originating Lov-5, appears encode an RNA helicase (AtRH18). To examine role allele Lovvik area, eight accessions collected 2009, we another 240 15 collections sites, including Lovvik, Sweden 2015. Genotyping revealed collection site separated rest. Crosses between 109 this area Sha 85 cases indicating chlorosis-causing common area. These results suggest alleles not occur at evolving code conserved processes.