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Comparison of a homozygous spl mutant ovule with sibling heterozygous ovule, both at floral stage 13. A, spl mutant ovule showing the complete absence of the embryo sac but presence of all maternal cell types. B, Heterozygous spl plant ovule showing mature embryo sac. Abbreviations: cn, central cell nuclei; en, egg cell nucleus; et, endothelium; ii, inner integument; n, nucellus; oi, outer integument; sn, synergid nucleus. Scale bars represent 50 μm.
