BigBill said: I woke up early today, couldn't sleep anymore. But as I await my morning coffee, I wanted to look into 2 things that I mentioned yesterday.
#1 is, I have no idea where that pale yellow color comes from in that Pahpiopedilum Quantum Light x Paphiopedilum concolor 'album' hybrid. Not a clue. There are a couple of award images that I found for P. concolor album and they were both white without a single spot. There isn't a hint of yellow anywhere.
I looked at about 25 P. S. Gratrix flowers quality awards as well. I could not find any yellow there either! It is a bit odd. I am beginning to wonder if the genes of this flowers were both carrying a recessive yellow trait and it somehow manifested itself in this hybrid? Very interesting.
I know Paphs have more complicated albinism genes than Cyms, but I am not surprised by the yellow.
Albinism typically means that the plant has an inability to produce certain pigments (in Cyms these are the anthocyanins that produce red, orange, brown, pink and purple). Albinism is a recessive trait, so the only way it manifests is if all copies of the relevant gene have the trait. When that occurs, the normal pigmentation is suppressed
but the plant still carries the genes for it. Consider the alba and regular forms of
Cym. tracyanum:
In 'Woodside', the alba trait blocks the expression of the spots and stripes. However, if you crossed an alba tracyanum to any non-alba Cym, you will see the spots and stripes return in the progeny! That's because the genes for that flower pattern still exist in the alba, they're just not visible due to the alba trait blocking the production of the pigment.
I strongly suspect something similar has happened here. Paph concolor is normally yellow, so the "album" form is presumably an albinistic one that blocks the normal production of the xanthin (yellow) pigment (this idea in itself is intriguing, as it suggests that the base colour in Paph concolor is tied to its ability to produce spots). When crossed with a regular Paph the yellow would be reasserted. The pale colour is the result of the white pigment of Quantum Light diluting it (as the colour alleles would be one white, one yellow).
Note that just because Quantum Light is white does not make it an albino. Both of its parents have a white base colour but exhibit spots, so at best QL would be an albino-carrier (since albinism is recessive) and that's only if one of the parents was an albino or albino carrier.