EFFECTS OF NEAR ULTRAVIOLET AND VISIBLE RADIATIONS ON CELL CYCLE KINETICS IN EXCISED ROOT MERISTEMS OF PISUM SATIVUM

Near-ultraviolet and visible radiations increased the duration of the mitotic cycle in excised pea root meristems primarily by lengthening the duration of the pre-DNA synthetic period (G1). All radiations tested shortened the duration of the post-DNA synthetic period (G2). The most pronounced effects were exhibited by green radiation, which lengthened the duration of the cell cycle, G1, DNA synthesis (S), and mitosis (M), and shortened the duration of G2. Progression of cells arrested by starvation in G, and G2 into DNA synthesis and mitosis was also affected by light treatments. Green radiation appeared to arrest a group of cells in DNA synthesis as well as in G, and G2. Meristems receiving green and near-ultraviolet radiations exhibited the most rapid progression of G, cells through S and G,.

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