Abstract
The activity of ATPases was studied in embryo axes and cotyledons of Norway maple seeds stratified at 3<sup>o</sup>C (dormancy broken) and 15<sup>o</sup>C (dormancy not broken). The activity of mitochondrial (F. III) and activity connected with all cellular membranes (F. Il) and soluble fraction (F. I) ATPases was investigated. It was found that mitochondrial ATPases are the most active. The activity of all types of ATPases is greater in seeds stratified at 3<sup>o</sup>C. It increases during seed dormancy breaking, particularly in the case of mitochondrial ATPases. The rise in the activity of mitochondrial and others ATPases in embryo axes of seeds stratified at 3<sup>o</sup>C is stepwise. In seeds stratified at 15<sup>o</sup>C ATPase activity generally decreases.
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