Figure 5From: Transcriptional profiles underlying parent-of-origin effects in seeds of Arabidopsis thalianaRelationship between phenotype and gene expression resulting from interploidy crosses and the fis1 mutation. (A) Composite seed showing the major phenotypic characteristics of maternal and paternal excess crosses. Cellularization/differentiation of endosperm proceeds from the micropylar ('maternal') to chalazal ('paternal') pole, occurring precociously in maternal excess and late or never in paternal excess. Chz = chalazal endosperm, PE = peripheral endosperm. Transcriptional profiling shows that fis1X2x seeds are strongly similar to extreme paternal excess in gene expression as well as phenotype. (B) PHE1 and other MADS-box transcription factors that encode interacting proteins are upregulated in paternal excess/fis1 and down or unchanged in maternal excess. Therefore these are strong candidates for key regulators of the interploidy cross phenotypes.Back to article page