Three anthocyanin polymorphisms inMimulus guttatusDC. have been described and analysed genetically. These involved leaf blotches, calyx dots, and general deposition of anthocyanin. In the case of leaf blotches two plants with sharply contrasting leaf blotches were analysed and it was shown that the blotch phenotype in each is due to the same gene, probably the dominant gene identified in a previous study, here calledL. (The difference between the plants must be ascribed to other complex genetic modifiers.) The presence or absence of calyx dots was shown to be due to a pair of alleles,C(presence) andc(absence). The presence or absence of general anthocyanin deposition in the stems petioles and calyces is controlled by the allelesA(presence) anda(absence). Whereas the expression ofLis less in warm conditions, the expression ofAis enhanced by exposure to the sun.
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