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. 2018 Mar 29;208(4):1337–1349. doi: 10.1534/genetics.118.300755

Figure 3.

Figure 3

The ABCE model of floral development is supported by Arabidopsis research. Wild-type Arabidopsis flowers consist of four floral whorls: 1 - sepals (se), 2 - petals (pe), 3 - stamens (st), and 4 - carpels (ca), shown in panel A. Sepals result from the combined activity of A and E genes; petals from B, A, and E genes, stamens from B, C, and E genes, and carpels from C and E genes. A and C genes are mutually repressive. To the right of wild type, four cases of disrupted floral development are shown. (B) In the absence of A-gene activity, only carpels and stamens form. (C) In the absence of B-gene activity, only sepals and carpels form. (D) In the absence of C-gene activity, only numerous sepal and petal structures form. (E) In the absence of E-gene activity, no floral structures form, and the numerous whorls resemble leaves (le), including the presence of leaf hairs (trichomes) decorating the surfaces. Figure modified from Krizek and Fletcher (2005).