Rosa kordesii
Rosa kordesii | |
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Rosa kordesii 'L 15', one of several garden roses produced with the same parentage | |
Scientific classification | |
Kingdom: | Plantae |
(unranked): | Angiosperms |
(unranked): | Eudicots |
(unranked): | Rosids |
Order: | Rosales |
Family: | Rosaceae |
Genus: | Rosa |
Species: | R. kordesii |
Binomial name | |
Rosa kordesii H.Wulff | |
Rosa kordesii, or Rosa × kordesii is a type of rose that arose naturally from hybridization followed by chromosome doubling. A hybrid between R. rugosa and R. wichurana was created called Rosa 'Max Graf', but it was diploid and nearly sterile, producing flowers but no fruit. This rose produced a few viable seeds as a result of self-pollination, and the seedlings that resulted were tetraploid instead of diploid, i.e., the chromosomes of both pollen and egg cells had been naturally duplicated. The tetraploid seedlings are amphidiploids.[1] A selection with double deep pink flowers and repeat bloom, also called 'K01 AgCan' was released by W. Kordes' Söhne in 1951.[2]
These tetraploid roses interbreed readily with one another, but not with their diploid ancestors. Under the biological species concept, a new species name Rosa kordesii was created for the tetraploid hybrid roses and their descendants.[3]
Amphidiploid roses can also be created deliberately from diploid-diploid hybrids by using colchicine spray on the growing tips of the plants. That strategy gives few successes, however, because the plant tissue has various chromosome numbers in different cells.[1] Amphidiploid roses including Rosa kordesii have been used to some degree in breeding programs in combination with naturally occurring tetraploid roses.[1]
References
Wikimedia Commons has media related to Rosa Kordesii Group. |
- 1 2 3 Janick, J. (2010), Plant Breeding Reviews, Wiley, ISBN 9780470650127 page 176
- ↑ Rosa kordesii H. Wulff rose Description, Helpmefind.com, retrieved 13 November 2015
- ↑ Wulff, H.D. (1951), "Rosa Kordesii, eine neue amphidiploide Rose", Der Züchter, 21 (4-5): 123–132, doi:10.1007/BF00709566