Preprophase

The preprophase is a phase during the mitosis of plant cells that does not occur in other eukaryotes . It precedes prophase and is characterized by two characteristic events:

1. The formation of the preprophase band , a dense collection of parallel microtubules directly below the plasma membrane .
2. The initiation of the formation of new microtubules at the nuclear envelope .

Plant cells are determined in their shape by their cell wall . In the course of the plant's growth, the level of cell division must therefore be precisely determined in order to ensure the correct orientation of each cell in the tissue .

The preprophase band is formed below the plasma membrane , in the cell cortex . It lies in the later level of cell division and consists of microtubules and microfilaments ( actin ).

The mitotic spindle is only formed at the beginning of the subsequent prophase and is based on the preprophase tape. This ensures that the cell's organelles are not distributed unevenly during mitosis .

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• Gerald Karp: Molecular Cell Biology . Springer, Berlin Heidelberg New York 2004, ISBN 3-540-23857-3