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Fig. 8. Genetic control of Antirrhinum floral meristem identity and
prophyll initiation by INCO and SQUA. Arrows indicate promoting functions and
bars show negative effects; neither of these is meant to be direct. Proteins
are shown as ovals. For simplicity, we neglect the option that INCO and SQUA
are likely to interact with other MADS-domain proteins. The control of
prophyll development by SQUA and INCO is highlighted by grey
on the left. The arrows merging in the FLO control show convergence
of processes promoting flower formation. Green shows potential activation by
preference for heterodimerisation of INCO with SQUA. Red (and thin lines)
suggests a possible mechanism that can counteract the negative influence of
the INCO homodimer on flowering in the wild type. Reinforced
heterodimerisation of INCO with SQUA supersedes repression of flowering by
INCO. This negative influence, therefore, is relevant only in the
squa mutant background.
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