Abstract
Cytophotometric analysis of the DNA content of nuclei of P. arcularius after Feulgen staining showed that some nuclei fail to divide during the duplication cycle of apical compartments. DNA synthesis is retarded in some apical nuclei, and consequently mitosis of these nuclei is also delayed. These nuclei have a 2C DNA value and divide during the next cycle of mitosis. Nuclei at the base of the apical compartment do not divide although they also have the 2C DNA value. These nuclei are eventually cut off from the apical compartment by septation, and remain non-dividing in the newly formed intercalary cells. They subsequently divide when the intercalary compartments produce aerial branches.
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