Figure 1.

Simplified scheme showing PAR1 and PAR2 in the transcriptional network used by phytochromes to induce SAS responses upon plant proximity perception. PAR1 and PAR2 have a role in this network, together with other PAR factors, like ATHB2, HFR1 and PIL1. Some of these factors might be interacting with PAR1 and PAR2. As a result, different PAR factors might be organized in regulatory modules, integrated within this web. We propose that PAR1 and PAR2 would connect light signals with hormonal cues, since SAUR15 and SAUR68, identified as direct targets of PAR1 action, are also hormone regulated. The identification of additional partners of PAR1 and/or PAR2 and their direct targets will help to fill gaps in this complex web of interactions. I1 to I4: partners of PAR1 and/or PAR2. (A–F) direct targets of PAR1 and/or PAR2; (E and F) SAUR15 and SAUR68 respectively.