RE:Hybidizing-Purple Leaf Base

I have resesched the inheritance of PFB and concluded that it is partially dominant rather then fully dominant. I have collected information from a number of listeres as well as checking my own records.  I have Canadian Streaker which is PFB from two non PBF parents, Cup Race X Laced Cotton. Several other people had PFB seedlings from two parents that didn't show PFB. I also have Limesicle (SDB) that is strongly PFB from two non PFB parents. The records quoted in the World of Iris was not a controlled experiment but a PFB parent X non pfb parent, but no checking to confirm that the green based plant wasn't a carrier of PFB gene. As far as I can tell you get PFB with three or four  PFB genes with occasionally faint PFB with two PFB genes in the right curcumstance. Weather also plays a role in the showing of PFB. Dusky Challenger ( probably two PFB genes)occasionally shows PFB in cool springs but not seen in all climates. Dusky challenger has lots of anthrocyanin as it is a dark purple so sometimes can show this in the foliage whereas a light coloured flower might not.  I have several examples of white flowered plants (and pink) with strong PFB. I suspect that you can cross a strong PFB plant with a non PFB plant and get no PFB in the offspring. For this you need a non-PFB plant that does not carry any PFB genes. I'm currently loking for this and feel fairly certain that I will find it. 
I have run numerous Punnett square hypothesis on PFB and checked ratios of PFB in offspring of crosses with information of my own and that provided by different people. The partial dominant theory seems to be the best fit to the data. I'm collecting more datra of my own. The problem is that so many of my crosses are made with seedlings and I hadn't kept records of PFB  before now with the seedlings.  

-- 
Chuck Chapman, Guelph, Ontario, Canada. Zone 4/5


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