For those people who are looking to use Austrian Copper, try (Angéle Pernet). Its tetraploid so no ploidy issues and it repeats. Health wise here where I am, its pretty good, I have never seen it in real trouble. Its Pernetiana colour is transferred to the offspring, but it depends on what you put the pollen on, giving the greatest results of colour intensity.
Warren
Warren, have you been using Angéle Pernet in your species f1 work?
You have that right! One point, though. In order to have bright yellow, the rose also must lack the carotene-cleaving enzyme. That’s why I brought up a few examples of diploids derived from R. foetida. ‘Comtesse du Cayla’ is one. Much of the strong fragrance is presumably derived from the oxidative degradation of carotenes, some of them (we hope) coming from the Foetida grandparent. The novelty of this approach is that these diploid derivatives don’t seem to have the same problem with blackspot. Crossed with the yellow flowered Tea-Noisettes, for example, they might contribute a deeper shade of yellow … and maybe a useful bit of hardiness … in roses that don’t “spot”.
Don I do not use Angéle Pernet on species, its main purpose in my breeding programmes is to enrich and brighten colours in my cultivars.
Warren
diploids derived from R. foetida. ‘Comtesse du Cayla’ is one.
Do you mean Mevrouw Nathalie Nypels?
Yes. I shouldn’t stay up late trying to remember such things.
I have 2 plants of Persian Yellow. The first came from Weeks via Eurodesert in 2011. It is grafted. The plant produces lots of hips, a bit bigger in size than what R. spinosissima gives. The hips don’t look quite right though, almost normal but not quite. I’ve opened dozens of them, and there is never anything inside except a lot of fluff.
The second plant is own root and from High Country Roses. It also produces hips. I just assumed they would be the same as on the other Persian Yellow, although they look a tiny bit plumper. Same basic size. I opened some, and to my surprise they all had seeds. Kept the seeds from 1 hip–it had 6.
The plants themselves don’t have the same growth habit. The grafted one is lower and bushier. The own-root one is much taller and narrower. Not surprisingly, it freely suckers. The flowers do not look the same to me. Plant #1 has fuller flowers of a deeper yellow. The color intensifies in the sun (it doesn’t bloom in the highest heat of summer, so maybe that sun would fade it?). At Eurodesert it was the same–the flowers didn’t fade. Plant #2 has less double flowers which are not as cupped. Flowers fade in the sun.
Melissa
Could your less cupped, lighter yellow, seeded hips, lankier be Harison’s Yellow?
Perhaps, but I have a Harison’s Yellow about 40 feet away, and the flowers and growth habit don’t seem the same to me. On the other hand I also have William’s Double Yellow close to my Harison’s Yellow, and these two are quite similar. Although Willam’s Double Yellow is grafted (on multiflora) and is more vigorous (and strangely enough has repeated multiple times this year). I have to look closely at my pictures of the center of the flowers of HY and WDY to tell them apart.
Hugonis is about 6 feet from Persian Yeloow #2. From the leaves they look related but the flowers, though both yellow, are very different. Xanthina is about 30 feet away. It looks related to my other early yellows, yet still different. Primula and alabukensis are pretty distinctive.
Melissa