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. Author manuscript; available in PMC: 2012 Jan 1.
Published in final edited form as: Plant J. 2011 May 25;67(2):195–207. doi: 10.1111/j.1365-313X.2011.04598.x

Figure 9.

Figure 9

Proposed model for signal integration during SAS responses of Arabidopsis rosettes to increased canopy density (indicated by increased leaf area index, LAI). At low LAI, only the phyB pathway is triggered in response to FR radiation reflected from neighboring plants. At high LAI, when mutual shading among neighbors becomes intense, the reduction in B light activates the cry1 response pathway, which converges with the phyB pathway at the level of BR, PIF4 and PIF5, thereby boosting the SAS response. The mechanisms and signaling elements (BR RE) connecting BR with SAS are not known.