Plant Cell Photos
Wood structure. Coloured scanning electron micrograph (SEM) of wood from a Siberian pine tree (Pinus sibirica) from Mongolia. The vertical sections are growth rings, each representing one year's growth in the life of the tree. This wood dates from 534AD at far left to 539AD at far right. In the year 536AD the northern hemisphere experienced extreme cooling, which caused deformation of the wood's structure due to freezing of water within the cells. The following year, 537AD, was also cooler than
Pine needles, Pinus nigra (top) and Pinus resinosa (bottom). The amount and pattern of cell wall lignification in the internal tissues of these two superficially similar looking pine needles has been determined to be the causal basis for the “leaf bending test,” often used to discriminate these two species in the field.
Tobacco (Nicotiana tabacum) leaf epidermal cells showing bundles of f-actin (green) and Golgi bodies (red dots within cells). Red fluorescent protein also outlines the cells. A stoma is visible but the actin cytoskeleton and Golgi bodies within the guard cells are not marked. - Confocal 3D projection. John Runions