抄録
Crown gall tumors of the pea were studied karyologically during different periods of tumor development.
Diploid and tetraploid cells were observed at nearly equal frequency during almost all collection periods, and both showed normal karyotype 15 days and 80 days after inoculation. This suggests that anomalies of karyotype are not the cause or result of further development of the tumor. Octoploid cells were also seen at almost every collection period, and even 16-ploid cells appeared occasionally.
Mitotic frequency was found to persist at about 2% up to 100 days after inoculation. This suggests that cell division at a constant rate continues unlimitedly unless the physiological activity of the host plant declines.
