TCP factors are involved in the coordination of cell proliferation and cell differentiation, having roles in several aspects of plant development, such as regulation of the shoot apical meristem (SAM) ( Koyama et al., 2010 Li et al., 2012b), leaf development ( Palatnik et al., 2003 Ori et al., 2007), and lateral branching ( Doebley et al., 1997 Aguilar-Martínez et al., 2007). Plant architecture and organ form rely on developmental processes which involve the control of cell proliferation, cell growth and cell differentiation ( Ingram and Waites, 2006). Analysis of transgenic plants expressing AtTCP7-SRDX and AtTCP23-SRDX indicate a role of these factors in the control of cell proliferation. To circumvent the issue of genetic redundancy, dominant negative forms with SRDX repressor domain were used. We also determined that these factors are able to mutually interact in a yeast two-hybrid assay and regulate the expression of KNOX1 genes. We generated a pentuple mutant tcp8 tcp15 tcp21 tcp22 tcp23 and show that loss of function of these genes results in changes in leaf developmental traits. Gene redundancy is characteristic in this group, as also seen in the class II TCP genes. The similar expression pattern in young growing leaves found for this group suggests similarity in gene function. We studied a group of phylogenetically related class I TCP genes: At TCP7, At TCP8, At TCP22, and At TCP23. While the role of class II TCP genes in plant development is well known, data about the function of some class I TCP genes is lacking. This gene family is comprised of two groups, class I and class II. TCP family of plant-specific transcription factors regulates plant form through control of cell proliferation and differentiation. Department of Plant Biology, University of California, Davis, CA, USA.
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