Transmission Electron micrograph of a cell in an ungerminated Zea mays embryo.

The nucleus shows a polylobed shape and  dense aggregates of heterochromatin (yellow arrows) are observed in the nucleoplasm. In the cytoplasm the mitochondriae (M) show a roundshape with poorly developed cristae (see detail below), small vacuoles (V) and spherosomes (S) distributed along the thin primary wall (P). Gx : 12.000

A mitochondria with few poorly developed cristae (C). Scale: 0.5 μm