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Post by raymondo on Aug 4, 2015 6:32:59 GMT -5
If I cross a flint and dent corn, is the result just one (or the other)? In other words, is it a simple dominant/recessive relationship? Ditto for flint/flour and dent/flour. I ask because I'd like to develop a locally adapted flint and a locally adapted flour corn. The range available is pretty limited so I thought for the sake of diversity I could add some dents.
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Post by Joseph Lofthouse on Aug 4, 2015 12:21:46 GMT -5
I reviewed my photo archives... The dent trait doesn't stick around for me when grown in mixed populations... I think that I would have to purposefully select for it to keep it around. The pericarp is maternal only and so it's thickness and strength is highly influenced by the genetics of the mother, which might be different than those of the embryo. I found a few examples where individual kernels dented when the rest of the cob didn't, but they were rare exceptions (1 kernel per cob). Hmm. Doing some ball-park statistics, I suppose that might mean that there are 3 to 4 genes influencing denting. The quick disappearance of the denting trait in my corn populations suggests that they are recessive genes.
The flint/flour distinction seems to me like it's driven by a single gene with flour being dominant.
Dents have flour type kernels.
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Post by DarJones on Aug 4, 2015 16:32:52 GMT -5
Floury is dominant over flint, flint is dominant over dent. The relationship is complicated by multiple floury genes. Crossing dent X flint tends to produce significant heterosis. Floury X either of the others is less pronounced for heterosis. This indicates that floury would sit roughly in between dent and flint on a phylogeny tree. I crossed Cherokee Squaw (southern dent) X PI 648432 which is MO17 introgressed with high methionine. www.ars-grin.gov/cgi-bin/npgs/acc/display.pl?1729927 The result has been exceptionally high heterosis with ears and production comparable to modern hybrids.
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