The blockage in the G 1 phase of the cell cycle in the dormant shoot apex of ash.

摘要: The shoot apex of the terminal bud was studied in four successive physiological states: during dormancy, when dormancy breaks, third week after break and a later typical period active growth. DNA content measured Feulgen-stained nuclei axial zone, lateral rib meristem. mitotic index established for each zone During all meristem are phase G1 cell cycle blocked at same point common to nuclei. When this blockage is removed simultaneously resume their cycles starting point. remain synchronized awhile. In they until resumption