ISHS Acta Horticulturae 424: II International Rose Symposium
THE USE OF AMPHIDIPLOIDY IN THE DEVELOPMENT OF BLACKSPOT RESISTANT ROSE GERMPLASM |
| Authors: | D.H. Byrne, W. Black, Y. Ma, H.B. Pemberton |
| Abstract:
Field evaluations of several hundred rose cultivars, breeding lines, and species demonstrated that most modern roses are susceptible to the fungus blackspot (Diplocarpon rosae (Lib.) Wolf). Nevertheless, there are numerous wild diploid species which are left untouched. These diploid roses offer an excellent source of resistance if their traits can be incorporated into the tetraploid level. One approach to this challenge is to use amphidiploids such as Rosa kordesii. This apparent amphidiploid combines the diploid genomes of R. rugosa and R. wichuriana into a fertile tetraploid which has been used to develop cold hardy and disease resistant rose cultivars. Three amphidiploids that incorporate the genomes of five diploid rose species were crossed with 12 commercial rose cultivars to evaluate their fertility and breeding value for the creation of blackspot resistant rose germplasm. | |
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