Horticulture Research |
The rose genome has been mapped in greater detail than ever, and a new method to determine hybrid plants' parentage developed. A Dutch team, led by Rene Smulders of Wageningen University, planned to cross two roses, 'Morden Centennial' and 'Red New Dawn,' and map the resulting hybrid's genome. However, the crossed population displayed unexpected traits. Using genetic differences at DNA sites known as 'single nucleotide polymorphisms,' the team determined the heritage of this population. They found not only crosses of 'Morden Centennial' and 'Red New Dawn', but also 'Red New Dawn' with an unknown parent, and self-fertilized 'Red New Dawn'. This evidence for self-fertilization in roses presents both challenges and opportunities for breeders. The team generated three genetic maps, the most detailed for the self-fertilized plants, supporting further genomic analysis and cultivar development in roses.