Preliminary Study On Cross Breeding Of Shrub Rose

The project was carried out using Rosa primula, Rosa xanthina f. spontanea as main male parents with some cross combinations using Rosa laxa, Rosa sp, Rosa brunonii,’Xueshan Jiaoxia’,’Tianshan zhi guang’ and’Old Blush’as male parents, while morden roses mainly shrub rose as female parents to obtain new cultivars of shrub rose with strong resistance.Beijing botanical garden introduced105shrub rose species in recent years. Their ornamental characteristics and parentages were documented and the wild fertility of50species were observed.The optimum culture medium formula for germination of Rosa primula pollen was20%sucrose+100mg/L H3BO3, and for R. xanthina f. spontanea pollen was10%sucrose+50mg/L H3BO3。With61cross combinations, the total number of pollinated flowers being1963,542mature hybrid seeds were obtained. Only1seedlings were obtained from hybrid seeds in2010while9seedlings were obtained in2011. The hybridizations with affinity are:’Eyeopener’×Rosa primula,’Berk Shire’×Rosa xanthina f. spontanea,’Sally Holmes’×Rosa xanthina f. spontanea,’Laura Ford’×Rosa xanthina f. spontanea,’Twenty-fifth’×Rosa primula,’Partidge’×Rosa xanthina f. spontanea,’Partidge’X Rosa primula,’Partidge’X’Old Blush’,’Partidge’X Rosa laxa,’Partidge’×Rosa multiflora f. inermis,’Cambridgeshire’×Rosa xanthina f. spontanea,’Robin Redbreast’×Rosa primula,’Summer Sunrise’X Rosa primula,’Tess of The Durbervilles’X Rosa primula,’Petal Pushers’X Rosa primula,’Anna Zinkeisen’×Rosa xanthina f. spontanea,’Anna Zinkeisen’×Rosa laxa,’Care2000’X Rosa primula,’Bonica’×Rosa xanthina f. spontanea,’Robin Redbreast’×Rosa primula,’Palmengarten franfurt’×Rosa laxa,’Palmengarten franfurt’×Old Blush’The heterozygosity of seedling in2010was observed in morphology and ploidy level investigation. The ploidy levels of cultivars of shrub rose investigated in this research contained2,3,4,5,6.