THE BIOCHEMICAL FATE OF NITROGEN SUBSTITUTED PURINES (CYTOKININS) IN NORMAL RIPENING AND MUTANT TOMATOES.

摘要

The initial rates of disappearance of cytokinins, as determined by High Pressure Liquid Chromatography, for tomatoes which were vacuum infused with benzyladenine and isopentenyladenine were dissimilar between the normal ripening (Ohio CR-6 and Rutgers), ripening inhibited mutant (RIN) and non-ripening mutant (NOR) tomato varieties. The greatest rate of loss occurred at the mature green stage of ripeness for all varieties except NOR which was characterized by a low rate of loss that did not change much as the fruit aged. The simultaneous infusion of equal molar concentrations of isopentenyladenine and benzyladenine resulted in a reduction in the initial rates of loss for both cytokinins in the normal ripening and RIN varieties compared to controls. Benzyladenine did not affect the rate of loss of isopentenyladenine in the NOR variety. Radiolabelled (8-