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. 2016 Jul 12;7:996. doi: 10.3389/fpls.2016.00996

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Copyright © 2016 Yan, Zhang, Wang, Jian, Qiu, Baudino, Just, Raymond, Gu, Wang, Bendahmane and Tang.

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) or licensor 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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Model for Viridiflora phenotype formation. (A) wild-type ABCE model and expression of flower organ identity genes. (B) In Viridiflora the conversion of petals into leaf-like structures in whorl two is associated with the down-regulation of petal organ identity genes RcAP3, RcPI, and RcSEP3 combined with up-regulation of RcSOC1. In the third and fourth whorls the conversion of stamens and pistils to leaf-like structures is associated with a shift of A-class gene RcAP2 expression domain together with down-regulation of E class gene RcSEP3 and down-regulation of B (RcAP3 and RcPI), and C (RcAG). The down-regulation of gene expression is indicated with text of smaller size.