Some results of remote hybridization of garden roses in the south of Russia
Experiments on remote hybridization of garden roses were carried out in the Nikitsky Botanical Gardens National Scientific Center. The most effective in hybridization was the use of R. fedtschenkoana Regel. The natural area of this species covers central Asia, China and Afghanistan. Flowers are often white large (7-8 cm in diameter), not double-flowered, with an unpleasant smell, single or in inflorescences (up to 4). Bushes are up to 6 m high with leathery leaves and large straight thorns. Flowering is short (duration 6-7 days), early, in May, abundant, single. Decorative when covered with fruits. A valuable feature of the species is a complex resistance to fungal diseases. With the aim of obtaining disease-resistant cultivars the crossings of this species as the paternal parent form with the cultivar of floribunda garden group Kordes Sondermeldung were carried out. Among F1 hybrids that are not capable of forming fruits, valuable stable forms with double flowers were collected. To increase the decorative effect of these forms and, in particular, to eliminate the unpleasant smell of flowers, inherited from the paternal form, saturating crossings with Kordes Sondermeldung cultivar were carried out. Among F2 hybrids seven valuable immune early-flowering forms candidates for the cultivars assigned to the garden group semi-climbing and large-flowered climbing roses were selected. One of these forms, Vesennyaya Zarya, received the status of a cultivar. Another saturating hybridization with Kordes Sondermeldung allowed us to obtain valuable immune two forms with the sign of remontant flowering. Thus, it has been established that the species of R. fedtschenkoana is highly promising for the creation of cultivars resistant to fungal diseases under the conditions of the southern coast of the Crimea.
Plugatar, S.A., Klimenko, Z.K., Zykova, V.K. and Plugatar, Yu.V. (2020). Some results of remote hybridization of garden roses in the south of Russia. Acta Hortic. 1288, 109-112
species, hybrid, cultivar, complex stability, remontant flowering, saturating crossing