Studies On Parental Selection Of Tree Peonies And Early Identification Of Several Hybrids

Tree peonies, belonged to Paeonia Paeoniaceae, are Chinese famous traditional flowers. The resources of tree peonies in China are rich, and all of the wild tree peonies are native to this country. A variety of cultivar groups have been developed and the breeding of new cultivars has received more attention. But most of the wild species have not been used in the hybridization. Based on the wide collections from all over the world, in this study, we did a great deal of crosses. The main results are as followed:1. Paeonia qiui and P. ostii are both good parents' materials. The advanced generation hybrids are also good materials when they are used as male parents in distant hybridization. In this study,4180 seedlings were harvested from distant hybridization between Sect.Moutan and Sect. Paeon. This offsprings inherited more characteristics from the male parents and they may be the real hybrids.The best crosses are P. qiui×P. rockii 'Hong Lian'?P. ostii×P. suffruticosa 'Yu Lv'?P. ostii×P. rockii 'Zi Jin Cheng'?P. lactiflora 'MW'×'Southern Aurora'?'MW'×'Adelphi'??-1×'Southern Aurora'??-11×'Southern Aurora'.2. Twenty-six hybrids from 3 cross-combinations '?-6'×'Southern Aurora'?'MW' ×'Medora'?'?-1'×'Southern Aurora'were selected to detected by SSR markers. The results showed clearly they are all real hybrids. These hybrids gain more genetic information of their male parents than their female parents, indicating that novel germplasm resources were generated by interspecific crosses. The research shows intersectional hybrids have unique breeding values. In addition, SSR marker technology is practicable and effective for identification of hybrids derived from interspecific crosses.