SEED PLANTS

Cells
A similar image saw in the year 1665 the English physicist Robert Hooke looking on a razor-blade made thin section of a cork plug in his microscope. He named the walled empty spaces “the cells”. Photomicrograph, prim. magn. 200×.

snowberry
tomato
Cells of the snowberry (Symphoricarpos albus) and tomato (Solanum lycopersicum) fruits. Even in these native samples, the cell nuclei and nucleoli are apparent. Photomicrographs, prim. magn. 400×.

Allium
Negatively stained cells of the inner onion leaf (Allium sp.). Thick cell walls are apparent. Photomicrograph, prim. magn. 400×.

Allium sp.
In this native sample of onion cells, the cell nuclei were stained by an ordinary blue ink. Photomicrograph, prim. magn. 400×.

Allium sp.
Allium sp.
The cell nucleus with nucleolus in a native sample of onion cells. The nucleus is stained with the blue ink (down). Photomicrograph, prim. magn. 1000×.

DNA
A short filamentous segment of the nuclear DNA (arrowheads) in the electron microscope. Electron micrograph, prim. magn. 65 000×.

Carex sp.
A part of the nucleus (N), mitochondria (M), chloroplast (P) and ribosomes (R) in the cell of the sedge (Carex sp.). Electron micrograph, prim. magn. 40 000×.

Carex sp.
Chloroplast (P), mitochondrion (M), peroxisom with a catalase crystal (Pe) and ribosomes in the cytoplasm of the sedge cell. Electron micrograph, prim. magn. 50 000×.

The lamellar thylakoids (T) and dark grana (G) are apparent in the plastid
The lamellar thylakoids (T) and dark grana (G) are apparent in the plastid. Electron micrograph, prim. magn. 60 000×.

Tubules and cisterns of endoplasmic reticulum
Tubules and cisterns of endoplasmic reticulum negatively stained in the cell homogenate. Electron micrograph, prim. magn. 60 000×.

Bundles of cytoskeletal microtubules
Bundles of cytoskeletal microtubules negatively stained in the cell homogenate. Electron micrograph, prim. magn. 60 000×.

Cells from the outer onion leaf containing crystals of calcium oxalate
Cells from the outer onion leaf containing crystals of calcium oxalate. Photomicrograph, prim. magn. 200×.