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Metabolism and Enzymology

Kinetic Comparison of Cytokinin Nucleosidase Activity Isolated from Normally Ripening and Mutant Tomato Varieties ¹

Department of Food Science and Nutrition, The Ohio Agricultural Research and Development Center, The Ohio State University, Columbus, Ohio 43210

Kinetic parameters for cytokinin nucleosidase activity which catalyzes the deribosylation of N⁶(²-isopentenyl)adenosine (I⁶Ado) to produce the more "active" free base N⁵(²-isopenetyl)adenine (I⁶Ade) were compared for a normally ripening tomato (Lycopersicon esculentum L.) cultivar Rutgers, and two mutant tomato varieties (Nor and Rin). K_m for nucleosidase activity in Rutgers was lower (K_m = 0.1 millimolar) than that in either Nor (K_m = 0.14 millimolar) or Rin (K_m = 0.13 millimolar).

¹ Salaries and research support provided by the Ohio Agricultural Research and Development Center, The Ohio State University. Journal Article No. 265-88.