Submitted to: International Symposium on Woody Ornamentals of the Temperate Zone
Publication Type: Proceedings
Publication Acceptance Date: 8/2/2016
Publication Date: N/A
Interpretive Summary: N/A
Technical Abstract: Hydrangea macrophylla was in cultivation in Japan and China long before it was introduced to England and France in the late 19th to early 20th century. Modern breeding work began in Europe in the early 1900’s, resulting in the development of over 300 cultivars prior to the beginning of the second World War. Only limited germplasm was available during that time and for forty years H. macrophylla cultivars were “bred one to another, and in that time almost every possible combination of the available genes has been given birth”. USDA-USDA-ARS research efforts from the last decade include modern breeding methods such as wide hybridization, mutagenesis, ploidy manipulation, marker development, and genomics research in order to significantly expand the genetic pool and breeding options for new, improved cultivars. Here we describe the latest results to establish a transcriptome reference, genotype mapping populations and germplasm collections for association studies, and generate a whole genome reference sequence. Previous SSR data for Hydrangea macrophylla genotypes ‘Bailmer’ and ‘Vetichii’ have been updated to include SNP markers. Cultivar collections and F1 pseudo testcross mapping population are being analyzed for potential associations that should accelerate breeding using marker assisted strategies.