(Apr 1980)  Page(s) 205-6.  Includes photo(s).
 
The 2 similar and fertile RSM K1 and RSM K5 seedlings exhibited the rough foliage of R. rugosa to a greater degree than their sterile, probably triploid sisters. Pollen and stomata of the fertile seedlings were of the size found in tetraploid roses; cytological examination at meiosis confirmed a tetraploid count of 28 chromosomes in RSM K1. This strongly suggests they arose from ovules with the 2n complement of R. rugosa.

Since the 2 seedlings are similar except for petal number, only RSM K I is described.
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(Apr 1980)  Page(s) 205-6.  Includes photo(s).
 
The 2 similar and fertile RSM K1 and RSM K5 seedlings exhibited the rough foliage of R. rugosa to a greater degree than their sterile, probably triploid sisters. Pollen and stomata of the fertile seedlings were of the size found in tetraploid roses; cytological examination at meiosis confirmed a tetraploid count of 28 chromosomes in RSM K1. This strongly suggests they arose from ovules with the 2n complement of R. rugosa.

Since the 2 seedlings are similar except for petal number, only RSM K I is described.

Page(s) vol. 14, no. 6, pp. 764-765.  Includes photo(s).
 
Spotless Gold, Spotless Yellow, and Spotless Pink Rose: Blackspot Resistant Breeding Lines
Peter Semeniuk
Spotless Gold, Spotless Yellow, and Spotless Pink are the result of a breeding program begun in 1965 (3) to develop horticulturally suitable rose breeding lines with appreciable levels of resistance. They were selected from an F3 population derived from crosses between a tetraploid form of a blackspot resistant species (Rosa rugosa) and the commercial cultivars 'Goldilocks' and 'Chic'. Selections for disease resistance were made in the greenhouse following repeated inoculations of the F2 and F3 generations. Pollen fertility and seed set were comparatively good in all three cultivars.

Page(s) vol 14, pp. 764-765.  Includes photo(s).
 
Spotless Gold, Spotless Yellow, and Spotless Pink Rose: Blackspot Resistant Breeding Lines
Peter Semeniuk
Spotless Gold, Spotless Yellow, and Spotless Pink are the result of a breeding program begun in 1965 (3) to develop horticulturally suitable rose breeding lines with appreciable levels of resistance. They were selected from an F3 population derived from crosses between a tetraploid form of a blackspot resistant species (Rosa rugosa) and the commercial cultivars 'Goldilocks' and 'Chic'. Selections for disease resistance were made in the greenhouse following repeated inoculations of the F2 and F3 generations. Pollen fertility and seed set were comparatively good in all three cultivars.

Page(s) vol. 14, pp. 764-765.  Includes photo(s).
 
Spotless Gold, Spotless Yellow, and Spotless Pink Rose: Blackspot Resistant Breeding Lines
Peter Semeniuk
Spotless Gold, Spotless Yellow, and Spotless Pink are the result of a breeding program begun in 1965 (3) to develop horticulturally suitable rose breeding lines with appreciable levels of resistance. They were selected from an F3 population derived from crosses between a tetraploid form of a blackspot resistant species (Rosa rugosa) and the commercial cultivars 'Goldilocks' and 'Chic'. Selections for disease resistance were made in the greenhouse following repeated inoculations of the F2 and F3 generations. Pollen fertility and seed set were comparatively good in all three cultivars.