DURATION OF CELL CYCLES IN CULTURED ROOTS OF CONVOLVULUS

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Abstract
The durations of the cell cycle in physiologically different regions of the meristem of cultured roots of Convolvulus arvensis were determined by the metaphase‐accumulation technique involving colchicine. The cell cycle in the root cap increases from 13 hr in the actively dividing initials of the first tier to 155 hr in the slowly dividing initials of tiers 2–4 to an indeterminate value for derivatives of the initials in the root cap columella. The cycle times for the cells of the central cylinder and cortex are 21 and 27 hr, respectively. The cells of the quiescent center have a cycle of an estimated 420 hr. The duration of the cell cycle in these different regions is discussed in relation to the increased duration of G1 in slowly or non‐dividing cells. The possible regulation of cell division by the synthesis of a cell‐division factor in the quiescent center is also discussed.
Funding Information
  • National Institutes of Health (GM-08145, GM-41021)
  • U.S. Public Health Service