Red-light-enhanced conversion of tritiated gibberellin A9 into other gibberellin-like substances in homogenates of etiolated barley leaves

Summary Irradiation of homogenates of etiolated barley leaves with red light resulted in an increase in the levels of gibberellin (GA)-like substances as compared to dark controls. When homogenates were fed with ³H]-GA₉ there was as incorporation of the radioactivity into a number of other GA's: this process occurred to a greater extent in red light than in darkness, and could be inhibited by boiling the extract prior to addition of the ³H]-GA₉.Supported by National Research Council (Canada) grant A-5727 (Dr. D. M. Reid).Supported by National Research Council (Canada) grant A-2585 (Dr. R. P. Pharis).Supported by NATO-Science Research Council (U. K.) Postdoctoral Fellowship.