Colorchallenge: Yellow Wednesday with a spectacular dahlia
This marvellous dahlia is from my neighbour's garden. Dahlias are octoploids, which means that they have eight sets of homologous chromosomes--a fourfold increase over most plants. Their genome is not only markedly larger, but also disposed for more diversity due to mobile genetic components called transposons, which move and so modify many possible alleles.
A wild note within the history of the dahlia is that, in 1846, the Caledonia Horticultural Society in Edinburgh offered £2000 to the first person that successfully grew a blue dahlia. To this day, the feat has not been accomplished. Although dahlias produce anthocyanin (a necessary compound for natural pigments in the blue family), they are short a hydroxyl group to produce anthocyanin delphindin--a "true" blue. Consequently, dahlias are only found (thus far!) in purples, mauves, and violets.
Fortunately for me, it's not Blue Wednesday!
Happy Yellow Wednesday everyone!
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