Fig. 7. Model of GIS, ZFP8 and GIS2 action in Arabidopsis inflorescence
organs in response to GA and cytokinins. Broken lines: the interaction
between GIS and SPY was previously examined. The antagonistic role of SPY in
the regulation by ZFP8 and GIS2 of GA signalling is only suggested, as is the
possibility that the regulation of trichome initiation by cytokinins is not
solely dependent on GL1.