Advances in Rose Breeding and Genetics in North America
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2015, International Society for Horticultural Science. All rights reserved. Rose breeding and genetics work in North America is very active and shifting its emphasis towards the development of a sustainable rose that combines its beauty with good adaptability for garden use. Although there are more than 100 rose breeders in North America, only a few release and register and/or patent their creations. Their work is leading to more releases of better adapted shrub and floribunda type roses for landscape use. Nevertheless, a vast majority of the current cultivars are susceptible to foliage diseases. All three of the publically funded programs focus on the development of landscape roses resistant to black spot and tolerant to cold or heat stress. The ongoing research encompasses a wide range of topics such as rose genetics, cytogenetics, species relationships, rose taxonomy, rose viruses, and ploidy manipulation. The most critical issue facing rose breeders is how to efficiently develop excellent host plant resistance to disease, especially black spot but also others such as rust, powdery mildew, cercospora and rose rosette virus. The major emphasis at the University of Minnesota and Texas A&M University has been to understand the host-pathogen relationship between the rose and the black spot fungus and identifying molecular markers for the resistance genes to accelerate their introgression into superior horticultural phenotypes.
