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Responses of Adenine Nucleotides in Germinating Soybean Embryonic Axes to Exogenously Applied Adenine and Adenosine

^a Post Harvest Plant Physiology Laboratory, Agricultural Marketing Research Institute, Beltsville Agricultural Research Center, ARS, Beltsville, Maryland 20705

The ATP content of soybean (Glycine max [L.] Merr. cv. Kent) axes incubated for 3 hours in 1 mM solutions of adenine and adenosine increased over 100% and 75%, respectively, over axes incubated in water. The increase in ATP was primarily due to the conversion of these purines to nucleotides via the nucleotide salvage pathway. The ATP formed was in a metabolically active pool because label from adenine was incorporated into acid-insoluble material. Adenine also increased the levels of GTP, UTP, and CTP, but not to the extent of the ATP level.