Characterization of natural <i>mum2</i> mutants.

<p>(<i>A</i>) Schematic representation of the <i>MUM2</i> gene indicating the positions of the causal mutations in the different accessions and their effect on the encoded protein in capital letters. Boxes represent exons; black shading shows coding sequence; grey shading indicates 5′ and 3′ untranslated regions. (<i>B</i>) Steady state <i>MUM2</i> mRNA levels in developing siliques of indicated accessions, 8–12 days after pollination, represented as a percentage of the constitutive <i>EF1α-4a</i> (EF) gene abundance. Error bars represent SE (n = 6). (<i>C</i>) Ruthenium red stained seeds of indicated accessions after forced mucilage release by sequential treatment with HCl and NaOH. WT, wild type.</p>