Summary
The results from tetraploid hybrids of R. kordesii showed that flowering attributes can be improved by a suitable combination of modifying factors as was shown previously by investigations with diploid hybrids from R. rugosa. A longer flowering period than 7 weeks indicated always the ability for recurrent bloom in these investigations but a shorter flowering period did not always indicate non-recurrent bloom.
The offspring from the cross of the recurrent R. kordesii with the non-recurrent seedling G12 segregated into non-recurrent and recurrent types in a ratio of 3:1 for a tetrasomic inheritance, assuming a duplex segregation and complete dominance.
The flowering attributes could be improved without loss of a high level of winterhardiness.
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References
McFarland, 1969. Modern roses 7. McFarland Company, Harrisburg, Penn.
Semeniuk P., 1971. Inheritance of recurrent blooming in R. wichuraiana. J. Hered. 62: 203–204.
Svejda Felicitas, 1977. Breeding for improvement of flowering attributes in winterhardy Rosa rugosa hybrids. Euphytica 26: 697–701.
Wulff H. D., 1951. Rosa kordesii, eine neue amphidiploide Rose. Züchter 21 (4/5): 123–132.
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Svejda, F. Breeding for improvement of flowering attributes of winterhardy rosa kordesii Wulff hybrids. Euphytica 26, 703–708 (1977). https://doi.org/10.1007/BF00021695
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DOI: https://doi.org/10.1007/BF00021695