Anybody care to take a crack at, or comment in layperson terms what this means?
I assume R fedteschenkoana is not answered (explained) in septet theory as being a parent by this question.
From HMF comments by “the- big bear“ under R bifera and fedschenkona
“I have to say I’m a little confused about Fedtschenkoana being the pollen parent of the Damasks.
While I am in no way any kind of genetics expert, and indeed I am only just now starting to grasp some of the very basics, I do feel that in this instance things do not add up for me, no matter what way around I think of this - and this is why.
According to Hurst’s septet theory (which I don’t believe has been debunked, but please correct me if I’m wrong) and all the scientific (including genetic studies) discussions that I have found by all manner of people far more qualified than me, R. Moshata is described as an A septet diploid, R. Gallica as an A and C septet tetraploid, and R. Fedtschenkoana as a B and D septet tetraploid. These designations would fit with all the characteristics and traits of the three roses in question, so no problems there.
Now as I understand this, the initial cross between Moschata X Gallica would result in a triploid hybrid (fertile or otherwise, but that is not really relevant here). So far so reasonable. But- if this hybrid was then pollinated by Fedtschenkoana, surely the result would be something along the lines of an irregular A, B, C, D septet tetraploid - somewhat like the original seedling from Pernet Ducher’s cross that subsequently led to Soleil d’Or. (Or even something like an A, A, B, C, D, pentaploid?) Yet nowhere have I seen this fact discussed, let alone explained.
Am I missing something, or does that not add up with the finding of all 4 of the oldest of the Damasks as A and C septet tetraploids? Where did the B and D go?!
Any thoughts? Much obliged in advance.
I’ve pinned this comment on the Fedtschenkoana page as well.“