A meeting place for rose breeders.
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I have found by using certain cultivars or species , certain characteristics can be strongly represented. This is seedling S37 T64 which is 4 generations away from R.spinosissima. As you can see the thorns have prevailed.
Are you finding any regular pattern of segregation? Say, 50/50 or 25/75?
David Austin (1993) reported that when breeding with 'Conrad Ferdinand Meyer' about half of the offspring seemed to have been bred from 'Gloire de Dijon', and the rest from a Rugosa.
Similarly, Griffith Buck (1960) found that his Rosa laxa hybrids, crossed with HTs and Floribundas, gave about equal numbers of Hybrid Laxa types, and ordinary(ish) garden roses.
almost all seedlings bred from this line descending from "Maigold" produce these thorns along with that linseed oil fragrance. Xanthus was the only one to have sweet fruity perfume, mind you the thorns were well represented.
Have you worked in anything thornless to see if that helps?
What doesn't kill them makes them stronger.
Don I don't mind thorns, but I am working on some thornless lines. I did this cross http://www.helpmefind.com/gardening/l.php?l=2.64468 which ended up thornless, a lot of Noisettes are thornless and have good results.
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