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Plant and Cell Physiology, 1962, Vol. 3, No. 1 105-110
© 1962

Article

ADENOSINE TRIPHOSPHATASE ACTIVITY IN GERMINATING LETTUCE SEEDS

RUTH ALONI and ALEXANDRA POLJAKOFF-MAYBER

Department of Botany, The Hebrew University Jerusalem, Israel

Mitochondria isolated from lettuce seeds and seedlings are capable of hydrolyzing ATP. On basis of pH optima, there are at least two and probably three enzymes possessing ATPase activity. One of them is inhibited by EDTA and all of them are inhibited by NaF.

The ATP ase activity of the mitochondria is very slight in imbibed seeds but increases considerably with seedling growth. Other components of the cell also contain ATP hydrolyzing enzymes; however, most of these phosphatases in the seedling seem to be soluble enzymes.

(Received December 12, 1961; )
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