“…Thus, while RopGEF7 may contribute to mediating auxinactivated RAC/ROP signaling, the auxin-regulated RopGEF7 expression is apparently mediated by pathways different from those that regulate early auxin-responsive gene expression (Abel et al, 1995). Furthermore, upstream regulators of RopGEF7 signaling activity remain unknown, although receptor-like kinases, such as the pollen receptor kinases from tomato and Arabidopsis (Kaothien et al, 2005;Zhang and McCormick, 2007;Zhang et al, 2008) and, more recently, the FERONIA receptorlike kinase from Arabidopsis, have been shown to regulate RAC/ROP signaling. In particular, FERONIA has been shown to interact directly with RopGEFs, including RopGEF7 (Duan et al, 2010).…”