Residual meristem

As Restmeristeme is called meristematic cells that away from the vegetation cones with their Primärmeristemen have been preserved. Residual meristems are located in the vicinity of cells that have already differentiated and transformed into specific tissues. The residual meristem can be formed in layers, groups or strands. However, the ability to divide cells is only retained for a certain period of time, after which the meristematic character is replaced by a differentiation of the cells.

Examples of residual meristems in monocotyledonous plants are the basal axis members. These remain meristematic for a longer time in the form of intercalary growth zones and ensure that the internodes are stretched . In dicotyledonous plants, the fascicular cambium in the vascular bundle of the shoot and the pericambium or pericycle in the root are among the residual meristems. The former, together with the interfascicular cambium, is responsible for the growth in thickness of the shoot ; the latter, as a divisible tissue, is the starting point for the formation of lateral roots.

Residual meristems are not to be confused with meristemoids . In contrast to the residual meristems, these do not contain stem cells .

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