The interspecific cross was carried out using modern roses as female parents,while some wild species of Rosa from China,including R. primula,R. xanthina f. spontanea,R. brunonii,R. laxa and so on,as male parents. 20 compatible cross combinations were selected. The stigma receptivity and pollen vitalities of some parents were tested. Combined with precious hybridization studies,the influences of parent's sterility,genetic relationship,ploidy level and environment on inter-specific cross compability were analyzed. The results showed that parents' fertility was not the decisive factor in seed harvest;R. laxa was more compatible than other wild roses when crossed with modern roses. It was probably compatible when one parent of compatible cross was replaced by genetically close species or cultivars. Triploid and tetraploid were generated when hybridization was taken between tetraploid and diploid. Most hybrid seeds of Rosa canina inermis × R. primula and R. canina inermis × R. xanthina f. spontanea were tetraploid. According to the results,a new method of using diploid wild roses was proposed. This study further improved the system of cross-breeding.
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