Post by meadowview on Nov 21, 2009 14:35:18 GMT
Hi Carl:
We've produced dozens of crosses and run them through adulthood and into second generation and the results are still the same: anthocyanin-free inheritance is a single locus recessive allele. These results have been published in both HortScience and CPN. There is now no question as to this mode of inheritance and it does not change over generations. In fact, we've used this knowledge to be able to predict and isolate progeny for horticultural purposes, the green S. minor and other crosses being examples.
The color of seedlings does tell us presence/absence of anthocyanin and we can quickly make an assessment for the green allele. In the case of our recent cross of veinless S. purpurea with anthocyanin-free S. purpurea the results are clear: all seedlings produce anthocyanin in the F1 generation. Further support for the dominant recessive model of inheritance for the green allele.
The variety of flower and leaf colors you are seeing may be explained by a variety of other genetic inheritance models. See anthro.palomar.edu/mendel/mendel_3.htm. The main point is to examine a single trait and track that through crosses to discover the mode of inheritance. Many traits are involved in the production of flower color and that is why you may be seeing a range of colors. In the case of anthocyanin-free plants we were fortunate that this knockout blocks the later production of anthocyanin and the results were easy to discern.
Just because you have correlation (veinless with anthocyanin-free plants) does not mean you have causation. You could also make a case that there are many sites with anthocyanin-free plants but no veinless plants and hence no relationship.
Best,
Phil
We've produced dozens of crosses and run them through adulthood and into second generation and the results are still the same: anthocyanin-free inheritance is a single locus recessive allele. These results have been published in both HortScience and CPN. There is now no question as to this mode of inheritance and it does not change over generations. In fact, we've used this knowledge to be able to predict and isolate progeny for horticultural purposes, the green S. minor and other crosses being examples.
The color of seedlings does tell us presence/absence of anthocyanin and we can quickly make an assessment for the green allele. In the case of our recent cross of veinless S. purpurea with anthocyanin-free S. purpurea the results are clear: all seedlings produce anthocyanin in the F1 generation. Further support for the dominant recessive model of inheritance for the green allele.
The variety of flower and leaf colors you are seeing may be explained by a variety of other genetic inheritance models. See anthro.palomar.edu/mendel/mendel_3.htm. The main point is to examine a single trait and track that through crosses to discover the mode of inheritance. Many traits are involved in the production of flower color and that is why you may be seeing a range of colors. In the case of anthocyanin-free plants we were fortunate that this knockout blocks the later production of anthocyanin and the results were easy to discern.
Just because you have correlation (veinless with anthocyanin-free plants) does not mean you have causation. You could also make a case that there are many sites with anthocyanin-free plants but no veinless plants and hence no relationship.
Best,
Phil
