I've also had no luck with Prairie Blue Eyes in any kind of dip-crossing (if pods set they abort) and it seems most of its offspring were produced pre-1980's. If I were more interested in it as a parent cultivar I'd try what I did when Dixie Land Band produced no viable pods ... cross it with the "wrong" ploidy and learn that it really could not be called a dip, at least not the fans in my garden. It was quite fond, however, of tets and made tons of seedlings that are among those growing on my potting bench. Lovey dubby I'll assume those red "dip" cultivars are not of interest to geneticists,
chalyse said:To claify your terminology, by seed conversion, do you mean a natural mutation from one ploidy to another at the seed level (from same-ploidy parents, but mutating to a polidy different from both), or by seed produced from cross-pollination between different ploidys to start with?Tetraploid conversions are now routinely done by using colchicine or an equivalent on the growing point (shoot apical meristem) of fans but originally they were done by soaking seeds in colchicine. A seed conversion is a plant that was made tetraploid by soaking diploid seeds in colchicine. In the registration information for tetraploid plants that have a converted tetraploid as a parent the conversion is listed as "tet cultivar", for example, Arctic Blast (a tet) is from a cross of Arctic Blaze × Tet. Barbara Mitchell. The parent 'Arctic Blaze' is a normal tetraploid while the other parent, tet. 'Barbara Mitchell' was converted from the diploid version. When seed conversions were registered they might be registered as cultivar x (a tet) from a cross of cultivar y x cultivar z. Both cultivar y and cultivar z are normal diploids and their names would not be preceded with the abbreviation tet.
I'm glad you asked about the self-pollinated seedlings - it made me go back and read my notes and I was surprised to find that half of those that produced seedlings from self pollination did not successfully cross their own pollen out to other cultivars. I'll wonder if that might be from unusual pollen formation, the extreme temps they were blooming through, or some other possibility.
chalyse said: For example, I posted in January about having discovered my fans of Dixie Land Band were tet rather than dip as would be expected from its registration. At the time, Maurice thought it could not have been a tet conversion (http://garden.org/thread/view_...). But, after I mentioned it again in this Oddities thread, and he pondered its lineage further (http://garden.org/thread/view_...) he now notes that it might be a tet (http://garden.org/thread/view_...), just as I'd mentioned back in January after tons of seeds came from crossing it with tets.
As for the oddities, and my pictures of both Pitter Patter and its new offspring Spots and Stripes, I am drawn by the long decades (1972 to 2014, forty-two years!) between the time PP was registered, and the time it took for a hybridizer to step outside the box and give some genetically-relevant dabbing a try on it. In one generation it passed on genetics that, according to common wisdom and experts alike, was not ever before to be expected.'Spots and Stripes' (SnS) is from a cross of 'Pitter Patter' x 'Pink Stripes'. Although that is one generation from Pitter Patter it is not the typical cross that might produce a prediction that the spots would not appear in the first generation seedlings. A cross of Pitter Patter to a cultivar with solid petal colour (without any patterning involving loss of pigment) might cause some to consider that the seedlings might not show the spots but that would be on the assumption that the spotting was more or less recessive. If the spotting was considered to be genetic then it could be more or less dominant, more or less recessive or quantitative. The first generation seedlings in a cross to a non-patterned cultivar would not show spots only if the spotting was completely recessive. In a cross to a plant that has patterning involving the loss of pigment, even if that patterning is not spots but is stripes, etc., even a completely recessive spotting might appear in the first generation. Genetically, for example with 'jumping genes', the difference between a stripe and a spot depends only on the time during development at which the event occurred to create the pattern. Timing is likely to be a quantitative trait that varies continuously and so would be neither dominant nor recessive. In other words a cross between a cultivar with spots and one with stripes might produce seedlings with spots only, with stripes only, with both or with neither and possibly combinations of these.