Genes Exhibiting Type-D and E Functions
The D function genes were discovered in 1995. These genes are MADS-box proteins and they have a function that is distinct from those previously described, although they have a certain homology with C function genes. These genes are called FLORAL BINDING PROTEIN7 (FBP7) and FLORAL BINDING PROTEIN1L (FBP1l). It was found that, in Petunia, they are involved in the development of the ovule. Equivalent genes were later found in Arabidopsis, where they are also involved in controlling the development of carpels and the ovule and even with structures related to seed dispersal.
The appearance of interesting phenotypes in RNA interference studies in Petunia and tomato led, in 1994, to the definition of a new type of function in the floral development model. The E function was initially thought to be only involved in the development of the three innermost verticils, however, subsequent work found that its expression was required in all the floral verticils.
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