Dermatogen (from the Greek. Dermato and gene ) is a relatively homogeneous layer of surface cells in plants, derived from the fact that it subsequently forms a skin (δέρμα - skin ). Located outside, has a dense structure, refers to the primary educational tissue ( meristem ), located in the growing tips of the roots. The dermatogen has intercellular spaces, its cells usually divide so that the resulting partitions have an anticlinal direction, that is, they grow perpendicular to the root surface. The only exceptions are the aerial roots of orchid , aroid , as well as massive bulbous underground roots of some amaryllis and lily , in which the growth of these cells occurs periclinally, that is, it is directed parallel to the surface of the organ. In these cases, a multilayer, partially dead skin velamen is formed [1] .
Notes
- ↑ Dermatogen // Great Soviet Encyclopedia : [in 30 vol.] / Ch. ed. A.M. Prokhorov . - 3rd ed. - M .: Soviet Encyclopedia, 1969-1978.
Literature
- Dermatogen // Brockhaus and Efron Encyclopedic Dictionary : in 86 volumes (82 volumes and 4 additional). - SPb. , 1890-1907.