Expression of Zmf3’h1 requires P1 and/or P2 genes. (A) Ear phenotypes of different p1 alleles: P1-rr, red pericarp, red cob glumes; P1-wr, white pericarp, red cob glumes; P1-ww [4Co63] and P1-ww-1112, white pericarp and white cob glumes. (B) Gel blot of RNA extracted from pericarps and cob glumes of different p1 alleles was probed with Zmf3’h1 and c2 probes. P1-rr pericarps and cob-glumes and P1-wr cob-glumes show Zmf3’h1 expression. (C) RNA gel blot of silks from different p1 alleles was hybridized with various flavonoid gene fragments as probes. rRNA bands showing equal loading of RNA in different lanes.