抄録
DNA amount and concentration per nucleus of root tip nuclei of Vicia faba were measured by cytophotometry. DNA amount and concentration per nucleus differed with the distance from apex and it was seen that there existed three classes in DNA amount per nucleus. Rate of DNA synthesis was discussed related to DNA concentration. Low DNA amount per nucleus seen in apical initials required further study.
The author wishes to express his sincere thanks to Prof. N. Sinke of Kyoto University for valuable suggestion and criticism throughout this study.
