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. 2019 Mar 21;10:316. doi: 10.3389/fpls.2019.00316

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Copyright © 2019 Palumbo, Vannozzi, Magon, Lucchin and Barcaccia.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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The floral model and the underlying ABCDE model of organ identity determination in V. vinifera L. The bottom part of the figure shows the genetic ABCDE model. According to this model, organ identity during flower development in the model organism A. thaliana is controlled by five classes of floral homeotic genes providing overlapping floral homeotic functions: A, B, C, D, and E. A+E genes specify sepals, A+B+E specify petals, B+C+E specify stamens, C+E specify carpels, and C+D+E specify ovules. In the upper part of the figure we reported all genes belonging to different classes according to their expression in different flower organs analyzed. Asterisks indicate genes whose expression was not expected in a given whorl based on the floral ABCDE model.