Reply: Interaction between Brassinosteroids and Gibberellins: Synthesis or Signaling? In Arabidopsis, Both!

Brassinosteroids (BRs) are plant hormones with versatile roles. Among other functions, the BRs control cell elongation, division, and differentiation events (Gudesblat and Russinova, 2011), fulfill roles in adaptive growth processes (Wang et al., 2012; Fridman and Savaldi-Goldstein, 2013), and participate in abiotic and biotic stress responses (Kagale et al., 2007; De Bruyne etal., 2014;Ereminaet al., 2016). Theirmany roles throughout the plant life cycle are enabled by a central signaling module, which controls the expression of thousands of target genes (Sun et al., 2010; Yu et al., 2011). Thismodule has been heavily studied in the last twodecades, therebyconsiderably improving our understanding, which has been recently summarized in a number of excellent reviews (Guo et al., 2013; Wang et al., 2014; Singh and Savaldi-Goldstein, 2015). Here, we summarize our integrated model of BR-GA crosstalk (Unterholzner et al., 2015) and explain why we consider BRs as “master regulators” of GAbiosynthesis.