Abstract
An immunocytochemical method was used to determine the proportion of cells in the DNA synthesis (S phase) of the mitotic cycle in suspension cultures of soybean (Glycine max (L.) Merr. cv. Acme) callus of cotyledonary origin, the stably cytokinin-dependent tissue used in the cytokinin bioassay devised by Carlos O. Miller. A standard cell synchronization protocol involving hydroxyurea was used to demonstrate the applicability of the immunocytochemical method to this cell culture. Cells were brought to mitotic arrest by cytokinin withdrawal, and the cell division cycle was restarted by the addition of cytokinin. We have followed the pattern of resumption of S phase after the readdition of cytokinin. This pattern reveals the existence of three subpopulations of cells in cytokinin-starved cultures, consistent with the occurrence of three cytokinin-requiring events in the cell cycle: one in mitosis, one in S phase, and one in the G1 phase.
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Abbreviations
- BrdU:
-
5-bromo-2-deoxyuridine
- DI:
-
deionized water
- FITC:
-
fluorescein isothiocyanate
- HU:
-
hydroxyurea
- l-AOPP:
-
l-α-aminooxy-β-phenylpropionic acid
- LI:
-
labeling index
- PA:
-
polyamine
- PI:
-
propidium iodide
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Mader, J.C., Hanke, D.E. Immunocytochemical study of cell cycle control by cytokinin in cultured soybean cells. J Plant Growth Regul 15, 95–102 (1996). https://doi.org/10.1007/BF00192938
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DOI: https://doi.org/10.1007/BF00192938