Allele-specific expression of C2 type I MADS-box genes in the endosperm. GFP or YFP signals were analyzed at 2 and 5 DAP. The AGL reporter transgenes, including the pAGL90:GFP promoter fusion (A), the PHE1:YFP full-length gene fusion (B), the pAGL48:GFP fusion (C), and the pAGL91:GFP fusion (D), were inherited either from the maternal (m) or paternal (p) parent, while the mutant allele (mea-3 and fis2-8) was always inherited from the maternal parent. Bars = 100 µm.