a dna polymerase activity was isolated from cells of Oryza sativa L. grown in suspension culture. Molecular mass (ca. 180,000), optimal requirement for pH (neutral), Mg2+ ((5- 10 mM), Mn2+ (1 mM), template preference (activated DNA), lack of activity to N-ethylmaleimide and ionic strength are similar to those of the vertebrate alpha-plymerase. Like DNA polymerase alpha, the DNA polymerase described in this work is the most abundant in proliferating cells of Oryza sativaL., Parthenoscissus tricuspidata (Siebold et Zucc.) Planchon, Acer pseudoplatanus L. and Medicago sativa L. and responds to changes in the rate of cell multiplication. We therefore postulate that this alpha-like DNA polymerase is the replicating enzyme of plant cells.
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