Endoderm (from the Greek. Ένδον “inside” + δερμα “skin”) is an inner single-row layer of tightly closed cells of the primary cortex adjacent to the central cylinder of the axial organs of higher plants [1] .
In the stems, the endoderm is little differentiated and usually contains starchy grains, which is why it is also called starch-bearing vagina [2] . In the roots, the radial and transverse walls of the endoderm cells have thickenings in the form of belts containing suberin and lignin (these belts are called Caspari belts ), the passage cells of this layer remain thin-walled. Thus, the endoderm is a physiological barrier regulating the flow of water and ions from the primary cortex into the central cylinder of the root [3] .
In the old roots of monocotyledonous plants, the endoderm consists of two types of cells: living thin-walled access cells and cells with U-shaped thickening of the shells [4] .
See also
- Exoderm
Notes
- ↑ Endoderm // Brockhaus and Efron Encyclopedic Dictionary : in 86 volumes (82 volumes and 4 additional). - SPb. , 1890-1907.
- ↑ Lotova, Nilova, Rudko, 2007 , p. 42.
- ↑ Endoderm - an article from the Biological Encyclopedic Dictionary
- ↑ Lotova, Nilova, Rudko, 2007 , p. 94.
Literature
- Artsikhovsky V.M. ,. Endoderm // Brockhaus and Efron Encyclopedic Dictionary : in 86 volumes (82 volumes and 4 additional). - SPb. , 1890-1907.
- Lotova L.I. Botany: Morphology and anatomy of higher plants. - Ed. 4th, additional .. - M .: Book House "LIBROCOM", 2010. - 512 p. - ISBN 978-5-397-01047-4 .
- Lotova L.I., Nilova M.V., Rudko A.I. Dictionary of phytoanatomical terms: a training manual. - M .: Publishing house LCI, 2007. - 112 p. - ISBN 978-5-382-00179-1 .