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. 2021 Jan 11;217(2):iyaa036. doi: 10.1093/genetics/iyaa036

Figure 1.

Figure 1

Petal anthocyanin pigmentation is evolutionarily labile within and between species of Mimulus. (A) Shifts in petal color in Mimulus have primarily been tracked to genomic region pla1. The causal gene in the pla1 genomic region has been identified as the R2R3 MYB gene MaMYB2 in M. aurantiacus (Streisfeld et al. 2013); its ortholog PELAN in M. lewisii (Yuan et al. 2014); and one or more R2R3 MYB genes at the orthologous genomic region in M. guttatus (Lowry et al. 2012), M. cupreus (Cooley et al. 2011), and M. naiandinus (A. Cooley, unpublished data). Genomic region pla2 contains MaMYB1 in M. aurantiacus; its ortholog NEGAN in M. lewisii; and MYB5 in M. guttatus, M. cupreus, M. l. variegatus, and M. naiandinus. The two varieties of M.luteus are the purple-flowered M. l.variegatus (left) and the yellow-flowered M. l. luteus (right). Photo credits: M. aurantiacus courtesy of Matt Streisfeld; M. naiandinus courtesy of Melia Matthews. Divergence times not to scale. (B) Crosses between the two varieties of M. luteus reveal a spotting mechanism underlying the apparently solid purple pigmentation of M. l. variegatus, consistent with Turing-style reaction-diffusion.