To gain a more mechanistic understanding of the ABCE model, a biochemical interaction model, called the Quartet Model, has been proposed (Figure 20.29). (...) The MADS-RIN gene is a never of the SEPALLATA gene family, which also includes genes required for floral organ identity and floral meristem determinacy (see Chapter 20, Figure 20.29).
"Plant Physiology and Development" int'l 6e - Taiz, L., Zeiger, E., Møller, I.M., Murphy, A.
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Characteristics and regulatory pathway of the PrupeSEP1 SEPALLATA gene during ripening and softening in peach fruits.
Pubmed: http://dlvr.it/NSGqJX
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Remarkably, by expressing Class E genes in combination with Class A and B genes, it is possible to convert both cotyledons and vegetative leaves into petals (Figure 20.27).
"Plant Physiology and Development" int'l 6e - Taiz, L., Zeiger, E., Møller, I.M., Murphy, A.
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sep quadruple mutants show a conversion of all four floral organ types into leaflike structures, similar to the ap1, ap2, ap3/pi, and ag quadruple mutant (see Figures 20.24 and 20.26).
"Plant Physiology and Development" int'l 6e - Taiz, L., Zeiger, E., Møller, I.M., Murphy, A.
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Because of the sepal-rich phenotype of the triple mutant, the three AGL genes were renamed SEPALLATA1-3 (SEP1-3) and were added to the ABC model as class E genes (Figure 20.26).
"Plant Physiology and Development" int'l 6e - Taiz, L., Zeiger, E., Møller, I.M., Murphy, A.
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