Strasburger cell
The Strasburger cell is a protein-containing parenchymal cell in the phloem of the naked samos and ferns . There she assumes the role of escort cell of angiosperms . It is assumed that the Strasburger cell supports the metabolism of the sieve cells and is responsible for the active transport of substances between the sieve cell and the surrounding transformation parenchyma. It also acts as an intermediary between cortical ray parenchyma cells and mature sieve cells.
discovery
The cell type was discovered by Eduard Strasburger , who as a famous botanist of the 19th century also published the so-called " Strasburger " (the botany textbook for universities). Investigations into the structure and function of the Strasburger cells were mainly carried out on needle leaves of the genus Pinus .
Emergence
Unlike the escort cell , the Strasburger cell emerges from cambium cells . It does not arise from the inequitable division of a "sieve tube mother cell" which divides into sieve tube and escort cell. Like the escort cell , the Strasburger cell is connected to the sieve tube elements via many plasmodesmata . It belongs to the phloem , the tissue for assimilates.
metabolism
The Strasburger cell has many mitochondria and a lot of decondensed DNA , which indicates brisk RNA synthesis . It has a high metabolic activity and is rich in proteins and vacuoles, but relatively poor in carbohydrates . Strasburger cells therefore have a pronounced glandular character.
literature
- Andreas Bresinsky , Christian Körner , Joachim W. Kadereit , Gunther Neuhaus , Uwe Sonnewald : Strasburger - textbook of botany. Founded by E. Strasburger. Spektrum Akademischer Verlag, Heidelberg 2008 (36th edition) ISBN 978-3827414557