The characteristics of leaf stoma of different cucumber ecotypes were studied by scan electron microscope. The leaf selected for scanning electron microscopy were 1mm2, were fixed in 3mml, 1mol/L gluteraldehyde for 24 h, rinsed three times with cacodylate buffer (pH 7.2), then postfixed in osmium tetroxide for 2 h. Samples were removed from osmium tetroxide, washed there times in the cacodylate buffer, and dehydrared in a graded series of ethanol, later embedded in Spur's epoxy resin, attached to uncoated s...