Abstract
Changes in mitotic activity and frequency of spontaneous chromosome aberrations have been determined for primary roots of Zea mays , Pisum sativum , Vicia faba var. green Windsor and var. minor, and Allium cepa. Mitotic activity was found to decline with age in all root apices. In the primary root apices immediately after germination, there was a high frequency of spontaneous chromosome aberrations which declined with time after germination. However, in the case of V. faba var. green Windsor, Z. mays and P. sativum there was a return to the high levels of spontaneous chromosome aberration on ageing of the root apex.
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