RNA blotting indicates that theAGL12 MADS-box gene is preferentially
expressed in roots. Although RNA in situ hybridization data are not yet available for AGL12,
transgenic plants have been generated in which the AGL12 promoter has been fused to
the histochemical marker gene "GUS".
Transgenic plants that harbor the AGL12::GUS fusions show root-specific
expression, and the GUS activity is localized to specific cell types within the root.